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Postgres FD Implementation
Commit f66faadc authored by Tom Lane's avatar Tom Lane
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Make an editorial pass over the 9.4 release notes. 

Update the notes to include commits through today, and do a lot of
wordsmithing and markup adjustment.  Notably, don't use <link> where <xref>
will do; since we got rid of the text-format HISTORY file, there is no
longer a reason to avoid <xref>.
parent 259904ec
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doc/src/sgml/release-9.4.sgml
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......@@ -7,7 +7,7 @@
<note>
<title>Release Date</title>
<simpara>2014-??-??</simpara>
<simpara>Current as of 2014-05-10</simpara>
<simpara>Current as of 2014-08-17</simpara>
</note>
<sect2>
......@@ -23,44 +23,44 @@
<listitem>
<para>
Allow materialized views to be refreshed without blocking reads
Allow <link linkend="rules-materializedviews">materialized views</>
to be refreshed without blocking reads
</para>
</listitem>
<listitem>
<para>
<link linkend="logicaldecoding">Logical decoding</link> allows database
changes to be streamed out in a customizable format
Add support for <link linkend="logicaldecoding">logical decoding</>
of WAL data, to allow database changes to be streamed out in a
customizable format
</para>
</listitem>
<listitem>
<para>
Allow <link linkend="bgworker">background workers</link>
Allow <link linkend="bgworker">background worker processes</>
to be dynamically registered, started and terminated
</para>
</listitem>
<listitem>
<para>
Add structured (non-text) data type (<link
linkend="datatype-json"><type>JSONB</></link>) for storing
<type>JSON</> data
Add <link linkend="datatype-json"><type>jsonb</></link>, a more
capable and efficient data type for for storing <acronym>JSON</> data
</para>
</listitem>
<listitem>
<para>
Add <acronym>SQL</>-level command <link
linkend="SQL-ALTERSYSTEM"><command>ALTER SYSTEM</></link>
to edit the <filename>postgresql.conf</> configuration file
Add new <acronym>SQL</> command <xref linkend="SQL-ALTERSYSTEM">
for updating <filename>postgresql.conf</> configuration file entries
</para>
</listitem>
<listitem>
<para>
Reduce lock levels of some <link
linkend="SQL-ALTERTABLE"><command>ALTER TABLE</></link> commands
Reduce lock strength for some <xref linkend="SQL-ALTERTABLE">
commands
</para>
</listitem>
......@@ -77,10 +77,9 @@
<title>Migration to Version 9.4</title>
<para>
A dump/restore using <link
linkend="APP-PG-DUMPALL"><application>pg_dumpall</></link>, or use
of <link linkend="pgupgrade"><application>pg_upgrade</></link>, is
required for those wishing to migrate data from any previous release.
A dump/restore using <xref linkend="app-pg-dumpall">, or use
of <xref linkend="pgupgrade">, is required for those wishing to migrate
data from any previous release.
</para>
<para>
......@@ -92,131 +91,129 @@
<listitem>
<para>
Cause consecutive whitespace in <link
linkend="functions-formatting-table"><function>to_timestamp()</></link>
and <function>to_date()</> format strings to consume a corresponding
number of characters in the input string (whitespace or not), then
conditionally consume adjacent whitespace, if not in <literal>FX</>
mode (Jeevan Chalke)
Tighten checks for multidimensional <link
linkend="arrays">array</link> input (Bruce Momjian)
</para>
<para>
Previously consecutive whitespace characters in a non-<literal>FX</>
format string behaved like a single whitespace character and consumed
all adjacent whitespace in the input string. For example, previously
format string space-space-space would consume only the first space in
' 12', while it will now consume all three characters.
Previously, an input array string that started with a single-element
array dimension could later contain multidimensional segments,
e.g. <literal>'{{1}, {2,3}}'::int[]</>.
</para>
</listitem>
<listitem>
<para>
Tighten checks for multidimensional <link
linkend="arrays">array</link> input (Bruce Momjian)
Unicode escapes in <link linkend="datatype-json"><type>JSON</type></link>
text values are no longer rendered with the backslash escaped
(Andrew Dunstan)
</para>
<para>
Previously an input array string that started with a single-element
array dimension could later contain multidimensional segments,
e.g. <literal>'{{1}, {2,3}}'::int[]</>.
Previously, all backslashes in text values being formed into JSON
were escaped. Now a backslash followed by <literal>u</> and four
hexadecimal digits is not escaped, as this is a legal sequence in a
JSON string value, and escaping the backslash led to some perverse
results.
</para>
</listitem>
<listitem>
<para>
Change empty arrays returned by <application>intarray</> to be
zero-dimensional arrays (Bruce Momjian)
When converting values of type <type>timestamp</>
or <type>timestamptz</>
to <link linkend="datatype-json"><type>JSON</type></link>, render the
values in a format compliant with ISO 8601 (Andrew Dunstan)
</para>
<para>
Previously, empty arrays were returned as one-dimensional empty arrays
whose text representation looked the same as zero-dimensional arrays
(<literal>{}</>). <application>intarray</>'s behavior in this area
now matches the built-in array operators.
Previously such values were rendered according to the current
<xref linkend="guc-datestyle"> setting; but many JSON processors
require timestamps to be in ISO 8601 format.
</para>
</listitem>
<listitem>
<para>
Disallow NULL <link
linkend="xfunc-sql-variadic-functions"><literal>VARIADIC</></link>
function arguments (Pavel Stehule)
Cause consecutive whitespace in <link
linkend="functions-formatting-table"><function>to_timestamp()</></link>
and <function>to_date()</> format strings to consume a corresponding
number of characters in the input string (whitespace or not), then
conditionally consume adjacent whitespace, if not in <literal>FX</>
mode (Jeevan Chalke)
</para>
<para>
Such arguments must be cast to an array data type.
Previously, consecutive whitespace characters in a non-<literal>FX</>
format string behaved like a single whitespace character and consumed
all adjacent whitespace in the input string. For example, previously
a format string of three spaces would consume only the first space in
<literal>' 12'</>, but it will now consume all three characters.
</para>
</listitem>
<listitem>
<para>
<link linkend="SQL-SHOW"><command>SHOW TIME ZONE</></link> now
outputs constant time zone offsets in <acronym>POSIX</>-style zone
format (Tom Lane)
Fix <link
linkend="textsearch-functions-table"><function>ts_rank_cd()</></link>
to ignore stripped lexemes (Alex Hill)
</para>
<para>
Previously it was returned in <link
linkend="datatype-interval-output"><type>INTERVAL</></link> format.
The new format can be passed to <command>SET TIME ZONE</>.
Previously, stripped lexemes were treated as if they had a default
location, producing a rank of dubious usefulness.
</para>
</listitem>
<listitem>
<para>
Values of type
<link linkend="datatype-datetime"><type>timestamp</></link> and
<link linkend="datatype-datetime"><type>timestamptz</></link> are now
rendered in a string format compliant with ISO 8601 rather than the
default output format when converting to or used in
<link linkend="datatype-json"><type>JSON</type></link>.
(Andrew Dunstan)
For functions declared to
take <link linkend="xfunc-sql-variadic-functions"><literal>VARIADIC
"any"</></link>, an actual parameter marked as <literal>VARIADIC</>
must be of a determinable array type (Pavel Stehule)
</para>
<para>
Previously these were rendered in the default text output format
for the type, but many JSON processors require timestamps in ISO 8601
format.
Such parameters can no longer be written as an undecorated string
literal or <literal>NULL</>; a cast to an appropriate array data type
will now be required. Note that this does not affect parameters not
marked <literal>VARIADIC</>.
</para>
</listitem>
<listitem>
<para>
Unicode escapes in <link linkend="datatype-json"><type>JSON</type></link>
text values are no longer rendered with the backslash escaped.
(Andrew Dunstan)
</para>
<para>
Previously all backslashes in text values being formed into JSON were
escaped. Now a backslash followed by "u" and four hexadecimal digits is
not escaped, as this is a legal sequence in a JSON string value, and
escaping the backslash led to some perverse results.
<xref linkend="sql-discard"> now also discards sequence-related state
(Fabr&iacute;zio de Royes Mello, Robert Haas)
</para>
</listitem>
<listitem>
<para>
Rename <link linkend="SQL-EXPLAIN"><command>EXPLAIN
ANALYZE</></link>'s <quote>total runtime</quote> output to <quote>execution time</quote>
(Tom Lane)
ANALYZE</></link>'s <quote>total runtime</quote> output
to <quote>execution time</quote> (Tom Lane)
</para>
<para>
This was required now that planning time is also reported.
Now that planning time is also reported, the previous name was
confusing.
</para>
</listitem>
<listitem>
<para>
Fix <link
linkend="textsearch-functions-table"><function>ts_rank_cd()</></link>
to ignore stripped lexemes (Alex Hill)
<link linkend="SQL-SHOW"><command>SHOW TIME ZONE</></link> now
outputs simple numeric UTC offsets in <acronym>POSIX</> timezone
format (Tom Lane)
</para>
<para>
Previously stripped lexemes got a default location and could be
considered if mixed with non-stripped lexemes.
Previously, such timezone settings were displayed as <link
linkend="datatype-interval-output"><type>interval</></link> values.
The new output is properly interpreted by <command>SET TIME ZONE</>
when passed as a simple string, whereas the old output required
special treatment to be re-parsed correctly.
</para>
</listitem>
......@@ -229,15 +226,15 @@
</para>
<para>
Restoring such check constraints will lead to restore errors.
Previously such check constraints were allowed, but they would often
cause errors during restores.
</para>
</listitem>
<listitem>
<para>
Use the last specified <link
linkend="recovery-target"><varname>recovery_target</></link> if
multiple are specified (Heikki Linnakangas)
Use the last specified <xref linkend="recovery-target"> if multiple
values are specified (Heikki Linnakangas)
</para>
</listitem>
......@@ -249,16 +246,15 @@
<para>
User commands that did their own quote preservation might need
adjustment, e.g. <link
linkend="guc-archive-command">archive_command</link>, <link
linkend="restore-command">restore_command</link>, <command>COPY TO/FROM
PROGRAM</>.
adjustment. This is likely to be an issue for commands used in
<xref linkend="guc-archive-command">, <xref linkend="restore-command">,
and <link linkend="sql-copy"><command>COPY TO/FROM PROGRAM</></link>.
</para>
</listitem>
<listitem>
<para>
Remove system column <link
Remove catalog column <link
linkend="catalog-pg-class"><structfield>pg_class.reltoastidxid</></link>
(Michael Paquier)
</para>
......@@ -266,90 +262,82 @@
<listitem>
<para>
Remove support for native <application>krb5</> authentication
(Magnus Hagander)
Remove catalog column <link
linkend="catalog-pg-rewrite"><structfield>pg_rewrite.ev_attr</></link>
(Kevin Grittner)
</para>
<para>
The proper way to use <application>Kerberos</> authentication is
with <acronym>GSSAPI</>.
Per-column rules have not been supported since
<application>PostgreSQL</> 7.3.
</para>
</listitem>
<listitem>
<para>
Handle domains over arrays like plain arrays in PL/Python
(Rodolfo Campero)
Remove native support for <application>Kerberos</> authentication
(<option>--with-krb5</>, etc)
(Magnus Hagander)
</para>
<para>
Previously they were treated as strings.
The supported way to use <application>Kerberos</> authentication is
with <acronym>GSSAPI</>. The native code has been deprecated since
<productname>PostgreSQL</> 8.3.
</para>
</listitem>
<listitem>
<para>
Have libpq's <link
linkend="libpq-pqconnectdbparams"><function>PQconnectdbParams()</></link>
and <link
linkend="libpq-pqpingparams"><function>PQpingParams()</></link>
functions process zero-length strings as defaults (Adrian
Vondendriesch)
In <application>PL/Python</>, handle domains over arrays like the
underlying array type (Rodolfo Campero)
</para>
<para>
Previously, these functions treated zero-length string values as
defaults only in some cases.
Previously such values were treated as strings.
</para>
</listitem>
<listitem>
<para>
Remove system column <link
linkend="catalog-pg-rewrite"><structfield>pg_rewrite.ev_attr</></link>
(Kevin Grittner)
Make libpq's <link
linkend="libpq-pqconnectdbparams"><function>PQconnectdbParams()</></link>
and <link
linkend="libpq-pqpingparams"><function>PQpingParams()</></link>
functions process zero-length strings as defaults (Adrian
Vondendriesch)
</para>
<para>
Per-column rules have not been supported since
<application>PostgreSQL</> 7.3.
Previously, these functions treated zero-length string values as
selecting the default in only some cases.
</para>
</listitem>
<listitem>
<para>
<link linkend="pgupgrade"><application>pg_upgrade</></link> now
uses <option>-U</> to specify the user name (Bruce Momjian)
Change empty arrays returned by the <xref linkend="intarray"> module
to be zero-dimensional arrays (Bruce Momjian)
</para>
<para>
Previously <option>-u</> was used to specify the user name.
Also spell the long option as <option>--username</>, again for
consistency with other tools.
Previously, empty arrays were returned as zero-length one-dimensional
arrays, whose text representation looked the same as zero-dimensional
arrays (<literal>{}</>), but they acted differently in array
operations. <application>intarray</>'s behavior in this area now
matches the built-in array operators.
</para>
</listitem>
<listitem>
<para>
The maximum number of <link linkend="bgworker">background workers</link>
that can be registered
by <function>RegisterBackgroundWorker()</function> is now limited to
<link linkend="guc-max-worker-processes"><varname>max_worker_processes</></link>
<xref linkend="pgupgrade"> now uses <option>-U</>
or <option>--username</> to specify the user name (Bruce Momjian)
</para>
</listitem>
<listitem>
<para>
<link linkend="bgworker">background workers</link> registered at
postmaster startup time should set
<structfield>bgw_notify_pid</structfield> to 0.
<command></>
</para>
</listitem>
<listitem>
<para>
<command>DISCARD ALL</> now also discards sequence state.
Previously this option was spelled <option>-u</> or <option>--user</>,
but that was inconsistent with other tools.
</para>
</listitem>
......@@ -373,63 +361,56 @@
<listitem>
<para>
Have <link linkend="SQL-VACUUM"><command>VACUUM</></link> properly
report dead but not removable rows to the statistics collector
(Hari Babu)
Allow <link linkend="bgworker">background worker processes</link>
to be dynamically registered, started and terminated (Robert Haas)
</para>
<para>
Previously these were reported as live rows.
The <filename>contrib/worker_spi</> module shows an example of use
of this feature.
</para>
</listitem>
<listitem>
<para>
Allow <link linkend="bgworker">background workers</link> to be
dynamically registered, started and terminated (Robert Haas)
Allow dynamic allocation of shared memory segments (Robert Haas,
Amit Kapila)
</para>
<para>
<function>worker_spi_launch()</> in <application>worker_spi</>
shows an example of its use.
This feature is illustrated in <xref linkend="test-shm-mq">.
</para>
</listitem>
<listitem>
<para>
Allow dynamic allocation of shared memory segments (Robert Haas,
Amit Kapila)
During crash recovery or immediate shutdown, send uncatchable
termination signals (<systemitem>SIGKILL</>) to child processes
that do not shut down promptly (MauMau, &Aacute;lvaro Herrera)
</para>
<para>
This is illustrated in <link
linkend="test-shm-mq"><application>test_shm_mq</></link>.
This reduces the likelihood of leaving orphaned child processes
behind after <xref linkend="app-postmaster"> shutdown, as well
as ensuring that crash recovery can proceed if some child processes
have become <quote>stuck</>.
</para>
</listitem>
<listitem>
<para>
Improve <acronym>SSL</> renegotiation handling (&Aacute;lvaro
Herrera)
Improve randomness of the database system identifier (Tom Lane)
</para>
</listitem>
<listitem>
<para>
During immediate shutdown send uncatchable termination signals
to child processes that have not already shutdown (MauMau,
&Aacute;lvaro Herrera)
Make <xref linkend="SQL-VACUUM"> properly report dead but
not-yet-removable rows to the statistics collector (Hari Babu)
</para>
<para>
This reduces the likelihood of orphaned child processes after
<link linkend="app-postmaster"><application>postmaster</></link>
shutdown.
</para>
</listitem>
<listitem>
<para>
Improve randomness of the database system identifier (Tom Lane)
Previously these were reported as live rows.
</para>
</listitem>
......@@ -442,45 +423,44 @@
<listitem>
<para>
Improve speed of multi-key <link
linkend="GIN"><acronym>GIN</></link> lookups (Alexander Korotkov,
Heikki Linnakangas)
Reduce <link linkend="GIN"><acronym>GIN</></link> index size
(Alexander Korotkov, Heikki Linnakangas)
</para>
</listitem>
<listitem>
<para>
Reduce <link linkend="GIN"><acronym>GIN</></link> index size
(Alexander Korotkov, Heikki Linnakangas)
Indexes upgraded via <xref linkend="pgupgrade"> will work fine
but will still be in the old, larger <acronym>GIN</> format.
Use <xref linkend="SQL-REINDEX"> to recreate such an index in the
new format.
</para>
</listitem>
<listitem>
<para>
Indexes upgraded via <link
linkend="pgupgrade"><application>pg_upgrade</></link> will work
fine but will use the old larger <acronym>GIN</> format; <link
linkend="SQL-REINDEX"><command>REINDEX</></link> will recreate
the index in the new format.
Improve speed of multi-key <link
linkend="GIN"><acronym>GIN</></link> lookups (Alexander Korotkov,
Heikki Linnakangas)
</para>
</listitem>
<listitem>
<para>
Add <link linkend="GiST"><acronym>GiST</></link> index support
for <link linkend="datatype-inet"><type>INET</></link> and
<link linkend="datatype-cidr"><type>CIDR</></link> data types
for <link linkend="datatype-inet"><type>inet</></link> and
<link linkend="datatype-cidr"><type>cidr</></link> data types
(Emre Hasegeli)
</para>
<para>
Such indexes improve <link
linkend="cidr-inet-operators-table">subnet</link> and supernet
linkend="cidr-inet-operators-table">subnet and supernet</link>
lookups and ordering comparisons.
</para>
</listitem>
<listitem>
<para>
Fix race condition in B-tree page deletion (Heikki Linnakangas)
Fix rare race condition in B-tree page deletion (Heikki Linnakangas)
</para>
</listitem>
......@@ -502,8 +482,9 @@
<listitem>
<para>
Allow multiple backends to simultaneously insert into <link
linkend="wal"><acronym>WAL</></link> buffers (Heikki Linnakangas)
Allow multiple backends to insert
into <link linkend="wal"><acronym>WAL</></link> buffers
concurrently (Heikki Linnakangas)
</para>
<para>
......@@ -520,31 +501,25 @@
<listitem>
<para>
Improve performance of <link
linkend="syntax-window-functions"><literal>WINDOW</></link>
aggregate functions (David Rowley, Florian Pflug, Tom Lane)
Improve performance of aggregate functions used as <link
linkend="syntax-window-functions">window functions</link>
(David Rowley, Florian Pflug, Tom Lane)
</para>
</listitem>
<listitem>
<para>
Improve speed of aggregates which use <link
linkend="datatype-numeric"><type>NUMERIC</></link>s (Hadi
Moshayedi)
</para>
<para>
These include <function>SUM()</>, <function>AVG()</>, <link
linkend="functions-aggregate-statistics-table"><function>STDDEV()</></link>,
and <function>VARIANCE()</>.
Improve speed of aggregates that
use <link linkend="datatype-numeric"><type>numeric</></link> state
values (Hadi Moshayedi)
</para>
</listitem>
<listitem>
<para>
Attempt to <link linkend="vacuum-for-wraparound">freeze</link>
tuples when tables are rewritten with <link
linkend="SQL-CLUSTER"><command>CLUSTER</></link> or <link
tuples when tables are rewritten with <xref
linkend="SQL-CLUSTER"> or <link
linkend="SQL-VACUUM"><command>VACUUM FULL</></link> (Robert Haas,
Andres Freund)
</para>
......@@ -556,7 +531,7 @@
<listitem>
<para>
Improve speed of <link linkend="SQL-COPY"><command>COPY</></link>
Improve speed of <xref linkend="SQL-COPY">
with <literal>DEFAULT</> <link
linkend="functions-sequence-table"><function>nextval()</></link>
columns (Simon Riggs)
......@@ -574,33 +549,46 @@
<listitem>
<para>
Raise hard limit on the number of tuples held in memory during sorting
and B-tree <link linkend="SQL-CREATEINDEX">index builds</link> (Noah
Misch)
and B-tree index builds (Noah Misch)
</para>
</listitem>
<listitem>
<para>
Reduce memory allocated by <link
linkend="SQL-DO"><literal>DO</></link> blocks (Tom Lane)
Reduce memory allocated by <application>PL/pgSQL</>
<xref linkend="SQL-DO"> blocks (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Have the optimizer be more aggressive in creating restrictions
Make the planner more aggressive in extracting restriction clauses
from mixed <literal>AND</>/<literal>OR</> clauses (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Auto-resize the catalog cache (Heikki Linnakangas)
Disallow pushing volatile <literal>WHERE</> clauses down
into <literal>DISTINCT</> subqueries (Tom Lane)
</para>
<para>
This reduces memory consumption for backends accessing only a few
tables, and improves performance for backend accessing many tables.
Pushing down a <literal>WHERE</> clause can produce a more
efficient plan overall, but at the cost of evaluating the clause
more often than is implied by the text of the query; so don't do it
if the clause contains any volatile functions.
</para>
</listitem>
<listitem>
<para>
Auto-resize the catalog caches (Heikki Linnakangas)
</para>
<para>
This reduces memory consumption for sessions accessing only a few
tables, and improves performance for sessions accessing many tables.
</para>
</listitem>
......@@ -615,31 +603,32 @@
<listitem>
<para>
Expose the estimation of number of changed tuples since last <link
linkend="vacuum-for-statistics">ANALYZE</link> (Mark Kirkwood)
Add <xref linkend="pg-stat-archiver-view"> system view to
report <link linkend="wal"><acronym>WAL</></link> archiver activity
(Gabriele Bartolini)
</para>
</listitem>
<listitem>
<para>
This appears in <link
linkend="pg-stat-all-tables-view"><structfield>pg_stat_all_tables.n_mod_since_analyze</></link>.
Add <structfield>n_mod_since_analyze</> columns to
<xref linkend="pg-stat-all-tables-view"> and related system views
(Mark Kirkwood)
</para>
</listitem>
<listitem>
<para>
Add <link
linkend="pg-stat-archiver-view"><structname>pg_stat_archiver</></link>
system view to report <link linkend="wal"><acronym>WAL</></link>
archiver activity (Gabriele Bartolini)
These columns expose the system's estimate of the number of changed
tuples since the table's last <xref linkend="sql-analyze">. This
estimate drives decisions about when to auto-analyze.
</para>
</listitem>
<listitem>
<para>
Add <varname>backend_xid</> and <varname>backend_xmin</> columns to
the system view <link linkend="pg-stat-activity-view"><structname>pg_stat_activity</></link>
and <varname>backend_xmin</> to <link linkend="pg-stat-replication-view"><structname>pg_stat_replication</></link>
(Christian Kruse)
Add <structfield>backend_xid</> and <structfield>backend_xmin</>
columns to the system view <xref linkend="pg-stat-activity-view">,
and a <structfield>backend_xmin</> column to
<xref linkend="pg-stat-replication-view"> (Christian Kruse)
</para>
</listitem>
......@@ -660,38 +649,47 @@
<para>
This allows use of Elliptic Curve keys for server authentication.
Such keys are faster and have improved security over <acronym>RSA</> keys.
The new configuration parameter
<link linkend="guc-ssl-ecdh-curve"><varname>ssl_ecdh_curve</></link>
Such keys are faster and have better security than <acronym>RSA</>
keys. The new configuration parameter
<xref linkend="guc-ssl-ecdh-curve">
controls which curve is used for <acronym>ECDH</>.
</para>
</listitem>
<listitem>
<para>
Improve the default <link
linkend="guc-ssl-ciphers"><varname>ssl_ciphers</></link> value
Improve the default <xref linkend="guc-ssl-ciphers"> setting
(Marko Kreen)
</para>
</listitem>
<listitem>
<para>
Allow the server to specify the preferred <acronym>SSL</> cipher
order (Marko Kreen)
By default, the server not the client now controls the preference
order of <acronym>SSL</> ciphers
(Marko Kreen)
</para>
<para>
Previously, the order specified by <xref linkend="guc-ssl-ciphers">
was usually ignored in favor of client-side defaults, which are not
configurable in most <productname>PostgreSQL</> clients. If
desired, the old behavior can be restored via the new configuration
parameter <xref linkend="guc-ssl-prefer-server-ciphers">.
</para>
</listitem>
<listitem>
<para>
This is controlled by the new configuration parameter <link
linkend="guc-ssl-prefer-server-ciphers"><varname>ssl_prefer_server_ciphers</></link>.
Make <xref linkend="guc-log-connections"> show <acronym>SSL</>
encryption information (Andreas Kunert)
</para>
</listitem>
<listitem>
<para>
Have <link
linkend="guc-log-connections"><varname>log_connections</></link>
show <acronym>SSL</> encryption information (Andreas Kunert)
Improve <acronym>SSL</> renegotiation handling (&Aacute;lvaro
Herrera)
</para>
</listitem>
......@@ -706,142 +704,134 @@
<listitem>
<para>
Add <acronym>SQL</>-level <link
linkend="SQL-ALTERSYSTEM"><command>ALTER SYSTEM</></link> command
to adjust server-wide settings (Amit Kapila)
Add new <acronym>SQL</> command <xref linkend="SQL-ALTERSYSTEM">
for updating <filename>postgresql.conf</> configuration file entries
(Amit Kapila)
</para>
<para>
Previously such settings could only be changed by
editing <filename>postgresql.conf</> at the file system level.
Previously such settings could only be changed by manually
editing <filename>postgresql.conf</>.
</para>
</listitem>
<listitem>
<para>
Add <link linkend="guc-huge-pages"><varname>huge_pages</></link>
configuration parameter to use huge memory pages on Linux
(Christian Kruse, Richard Poole, Abhijit Menon-Sen)
</para>
<para>
This can improve performance on large memory systems.
Add <xref linkend="guc-autovacuum-work-mem"> configuration parameter
to control the amount of memory used by autovacuum workers
(Peter Geoghegan)
</para>
</listitem>
<listitem>
<para>
Show <acronym>PID</>s of lock holders and
waiters and improve relation information in <link
linkend="guc-log-lock-waits"><varname>log_lock_waits</></link>
log messages (Christian Kruse)
Add <xref linkend="guc-huge-pages"> parameter to allow using huge
memory pages on Linux (Christian Kruse, Richard Poole, Abhijit
Menon-Sen)
</para>
</listitem>
<listitem>
<para>
Add parameter <link
linkend="guc-autovacuum-work-mem"><varname>autovacuum_work_mem</></link>
to control the amount of memory used by autovacuum workers
(Peter Geoghegan)
This can improve performance on large-memory systems.
</para>
</listitem>
<listitem>
<para>
Add <link
linkend="guc-max-worker-processes"><varname>max_worker_processes</></link>
Add <xref linkend="guc-max-worker-processes"> parameter
to limit the number of background workers (Robert Haas)
</para>
<para>
This is helpful in configuring the standby server to have the
required same number of worker processes as the primary.
This is helpful in configuring a standby server to have the
required number of worker processes (the same as the primary).
</para>
</listitem>
<listitem>
<para>
Add configuration parameter <link
linkend="guc-wal-log-hints"><varname>wal_log_hints</></link>
to enable logging of hint bits (Sawada Masahiko)
Add superuser-only <xref linkend="guc-session-preload-libraries">
parameter to load libraries at session start (Peter Eisentraut)
</para>
<para>
Hint bits are not normally logged, except when checksums are enabled.
This is useful for external tools like <application>pg_rewind</>.
In contrast to <xref linkend="guc-local-preload-libraries">, this
parameter can load any shared library, not just those in
the <filename>$libdir/plugins</> directory.
</para>
</listitem>
<listitem>
<para>
Allow <function>printf</function>-style space padding to be specified in <link
linkend="guc-log-line-prefix"><varname>log_line_prefix</></link>
(David Rowley)
Add <xref linkend="guc-wal-log-hints"> parameter to enable WAL
logging of hint-bit changes (Sawada Masahiko)
</para>
<para>
Hint bit changes are not normally logged, except when checksums are
enabled. This is useful for external tools
like <application>pg_rewind</>.
</para>
</listitem>
<listitem>
<para>
Add superuser-only <link
linkend="guc-session-preload-libraries"><varname>session_preload_libraries</></link>
configuration parameter to load libraries at session start
(Peter Eisentraut)
Increase the default settings of <xref linkend="guc-work-mem">
and <xref linkend="guc-maintenance-work-mem"> by four times (Bruce
Momjian)
</para>
<para>
In contrast
to <link linkend="guc-local-preload-libraries"><varname>local_preload_libraries</></link>
this parameter can load any shared library, not just those in
the <filename>$libdir/plugins</> directory.
The new defaults are 4MB and 64MB respectively.
</para>
</listitem>
<listitem>
<para>
Reduce server logging level when loading shared libraries (Peter
Geoghegan)
Increase the default setting of <xref
linkend="guc-effective-cache-size">
to 4GB (Bruce Momjian, Tom Lane)
</para>
</listitem>
<listitem>
<para>
The previous level was <literal>LOG</>, which was too verbose
for per-session libraries.
Allow <function>printf</function>-style space padding to be
specified in <xref linkend="guc-log-line-prefix"> (David Rowley)
</para>
</listitem>
<listitem>
<para>
Increase <link
linkend="guc-work-mem"><varname>work_mem</></link> and <link
linkend="guc-maintenance-work-mem"><varname>maintenance_work_mem</></link>
defaults by four times (Bruce Momjian)
Allow terabyte units (<literal>TB</>) to be used when specifying
configuration variable values (Simon Riggs)
</para>
</listitem>
<listitem>
<para>
The new defaults are 4MB and 64MB respectively.
Show <acronym>PID</>s of lock holders and waiters and improve
information about relations in <xref linkend="guc-log-lock-waits">
log messages (Christian Kruse)
</para>
</listitem>
<listitem>
<para>
Increase the default setting of <link
linkend="guc-effective-cache-size"><varname>effective_cache_size</></link>
to 4GB (Bruce Momjian, Tom Lane)
Reduce server logging level when loading shared libraries (Peter
Geoghegan)
</para>
</listitem>
<listitem>
<para>
Allow terabyte units to be specified for configuration variable
values (Simon Riggs)
The previous level was <literal>LOG</>, which was too verbose
for per-session libraries.
</para>
</listitem>
<listitem>
<para>
Have Windows <literal>SQL_ASCII</>-encoded databases and server
process (e.g. <link linkend="app-postmaster">postmaster</>) emit
messages in the character encoding of the server's Windows user locale
On Windows, make <literal>SQL_ASCII</>-encoded databases and server
processes (e.g., <xref linkend="app-postmaster">) emit messages in
the character encoding of the server's Windows user locale
(Alexander Law, Noah Misch)
</para>
......@@ -862,24 +852,37 @@
<itemizedlist>
<listitem>
<para>
Add <link linkend="streaming-replication-slots">replication
slots</link> to coordinate activity on streaming standbys with the
node they are streaming from (Andres Freund, Robert Haas)
</para>
<para>
Replication slots allow preservation of resources like
<acronym>WAL</> files on the primary until they are no longer
needed by standby servers.
</para>
</listitem>
<listitem>
<para>
Add <link linkend="recovery-config"><filename>recovery.conf</></link>
parameter <link linkend="recovery-min-apply-delay"><varname>recovery_min_apply_delay</></link>
parameter <xref linkend="recovery-min-apply-delay">
to delay replication (Robert Haas, Fabr&iacute;zio de Royes Mello,
Simon Riggs)
</para>
<para>
This is useful for delaying the replay of user errors on standby
servers.
Delaying replay on standby servers can be useful for recovering
from user errors.
</para>
</listitem>
<listitem>
<para>
Add <link
linkend="recovery-target"><varname>recovery_target</></link>
Add <xref linkend="recovery-target">
option <option>immediate</> to stop <link
linkend="wal"><acronym>WAL</></link> recovery as soon as a
consistent state is reached (MauMau, Heikki Linnakangas)
......@@ -894,9 +897,9 @@
<para>
The timestamp reported
by <link linkend="functions-recovery-info-table"><function>pg_last_xact_replay_timestamp()</></link>
now shows information about already-committed records, not of transactions
about to be committed. Recovering to a restore point now replays the
restore point, rather than stopping just before the restore point.
now reflects already-committed records, not transactions about to
be committed. Recovering to a restore point now replays the restore
point, rather than stopping just before the restore point.
</para>
</listitem>
......@@ -904,7 +907,7 @@
<para>
<link
linkend="functions-admin-backup-table"><function>pg_switch_xlog()</></link>
now clears the trailing unused space in the <acronym>WAL</> file
now clears any unused trailing space in the old <acronym>WAL</> file
(Heikki Linnakangas)
</para>
......@@ -915,15 +918,9 @@
<listitem>
<para>
Add <link linkend="streaming-replication-slots">replication
slots</link> to coordinate activity on streaming standbys with the
node they are streaming from (Andres Freund, Robert Haas)
</para>
<para>
Replication slots allow preservation of resources like
<acronym>WAL</> files on the primary that are needed by standby
servers.
Report failure return codes from <link
linkend="archive-recovery-settings">external recovery commands</>
(Peter Eisentraut)
</para>
</listitem>
......@@ -934,14 +931,6 @@
</para>
</listitem>
<listitem>
<para>
Report failure return codes from <link
linkend="archive-recovery-settings">external recovery commands</>
(Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Write <acronym>WAL</> records of running transactions more
......@@ -949,7 +938,7 @@
</para>
<para>
This allows standby servers to start faster and cleanup resources
This allows standby servers to start faster and clean up resources
more aggressively.
</para>
</listitem>
......@@ -960,7 +949,7 @@
<title><link linkend="logicaldecoding">Logical Decoding</></title>
<para>
Logical decoding allows database changes to be optionally streamed in a
Logical decoding allows database changes to be streamed in a
configurable format. The data is read from
the <link linkend="wal"><acronym>WAL</></link> and transformed into the
desired target format. To implement this feature, the following changes
......@@ -968,58 +957,52 @@
</para>
<itemizedlist>
<!-- FIXME: This imo needs a pretty fundamental rewrite -->
<listitem>
<para>
Add new <option>logical</> <link
linkend="guc-wal-level"><varname>wal_level</></link> to enable
logical change-set encoding in <acronym>WAL</> (Andres Freund)
</para>
<listitem>
<para>
This interacts with <link
linkend="catalog-pg-class"><literal>REPLICA IDENTITY</></link>.
Add support for <link linkend="logicaldecoding">logical decoding</>
of WAL data, to allow database changes to be streamed out in a
customizable format
(Andres Freund)
</para>
</listitem>
<listitem>
<para>
Allow <link
linkend="app-pgrecvlogical"><application>pg_recvlogical</></link>
to receive logical decoding data (Andres Freund)
Add new <xref linkend="guc-wal-level"> setting <option>logical</>
to enable logical change-set encoding in <acronym>WAL</> (Andres
Freund)
</para>
</listitem>
<listitem>
<para>
Add <link
linkend="test-decoding"><application>test_decoding</></link>
module to illustrate logical decoding at the <acronym>SQL</>
level (Andres Freund)
Add table-level parameter <link
linkend="catalog-pg-class"><literal>REPLICA IDENTITY</></link>
to control logical replication (Andres Freund)
</para>
</listitem>
<listitem>
<para>
Allow logical decoding via the walsender interface ? (Andres
Freund)
Add relation option <link
linkend="SQL-CREATETABLE-storage-parameters"><option>user_catalog_table</></link>
to identify user-created tables involved in logical change-set
encoding (Andres Freund)
</para>
</listitem>
<listitem>
<para>
Add table-level parameter <link
linkend="catalog-pg-class"><literal>REPLICA IDENTITY</></link>
to control logical replication (Andres Freund)
Add <xref linkend="app-pgrecvlogical"> application to receive
logical-decoding data (Andres Freund)
</para>
</listitem>
<listitem>
<para>
Add relation option <link
linkend="SQL-CREATETABLE-storage-parameters"><option>user_catalog_table</></link>
to identify user-created tables involved in logical change-set
encoding (Andres Freund)
Add <xref linkend="test-decoding"> module to illustrate logical
decoding at the <acronym>SQL</> level (Andres Freund)
</para>
</listitem>
......@@ -1034,19 +1017,12 @@
<itemizedlist>
<listitem>
<para>
Add <link linkend="queries-tablefunctions"><literal>ROWS
FROM()</></link> syntax to allow horizontal concatenation of
set-returning functions in the <literal>FROM</>-clause (Andrew Gierth)
</para>
</listitem>
<listitem>
<para>
Add <link linkend="queries-tablefunctions"><literal>WITH
ORDINALITY</></link> syntax to number rows returned from
<literal>FROM</>-clause functions (Andrew Gierth, David Fetter)
set-returning functions in the <literal>FROM</> clause
(Andrew Gierth, David Fetter)
</para>
<para>
......@@ -1057,13 +1033,21 @@
<listitem>
<para>
Allow <link linkend="SQL-SELECT"><command>SELECT</></link> with
Add <link linkend="queries-tablefunctions"><literal>ROWS
FROM()</></link> syntax to allow horizontal concatenation of
set-returning functions in the <literal>FROM</> clause (Andrew Gierth)
</para>
</listitem>
<listitem>
<para>
Allow <xref linkend="SQL-SELECT"> to have
an empty target list (Tom Lane)
</para>
<para>
This was added so views that select from a table with zero columns
can be dumped correctly.
This was added so that views that select from a table with zero
columns can be dumped and restored correctly.
</para>
</listitem>
......@@ -1079,7 +1063,7 @@
<listitem>
<para>
Add <link linkend="SQL-DISCARD"><command>DISCARD
SEQUENCES</></link> command to discard cached sequence information
SEQUENCES</></link> command to discard cached sequence-related state
(Fabr&iacute;zio de Royes Mello, Robert Haas)
</para>
......@@ -1090,14 +1074,15 @@
<listitem>
<para>
Add <command>FORCE NULL</> option
to <link linkend="SQL-COPY"><command>COPY FROM</></link> which causes
quoted strings matching the null string to be converted to NULL in
<literal>CSV</> mode (Ian Barwick, Michael Paquier)
Add <literal>FORCE NULL</> option
to <link linkend="SQL-COPY"><command>COPY FROM</></link>, which
causes quoted strings matching the specified null string to be
converted to NULLs in <literal>CSV</> mode (Ian Barwick, Michael
Paquier)
</para>
<para>
Previously only unquoted matching strings would be imported
Without this option, only unquoted matching strings will be imported
as null values.
</para>
</listitem>
......@@ -1105,41 +1090,41 @@
<listitem>
<para>
Issue warnings for commands used outside of transaction blocks
because they have no effect (Bruce Momjian)
when they can have no effect (Bruce Momjian)
</para>
<para>
The cases are <literal>SET
LOCAL</>, <literal>SET CONSTRAINTS</>, <literal>SET TRANSACTION</> and
<literal>ABORT</>.
New warnings are issued for <command>SET
LOCAL</>, <command>SET CONSTRAINTS</>, <command>SET TRANSACTION</> and
<command>ABORT</> when used outside a transaction block.
</para>
</listitem>
</itemizedlist>
<sect4>
<title><link linkend="SQL-EXPLAIN"><command>EXPLAIN</></link></title>
<title><xref linkend="SQL-EXPLAIN"></title>
<itemizedlist>
<listitem>
<para>
Have <command>EXPLAIN ANALYZE</> output planning time (Andreas
Make <command>EXPLAIN ANALYZE</> show planning time (Andreas
Karlsson)
</para>
</listitem>
<listitem>
<para>
Have <command>EXPLAIN</> print the grouping columns in Agg and
Make <command>EXPLAIN</> show the grouping columns in Agg and
Group nodes (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Have <command>EXPLAIN ANALYZE</> show bitmap heap scan exact/lossy
block information (Etsuro Fujita)
Make <command>EXPLAIN ANALYZE</> show exact and lossy
block counts in bitmap heap scans (Etsuro Fujita)
</para>
</listitem>
......@@ -1154,7 +1139,8 @@
<listitem>
<para>
Allow materialized views to be refreshed without blocking reads
Allow <link linkend="rules-materializedviews">materialized views</>
to be refreshed without blocking reads
(Kevin Grittner)
</para>
......@@ -1174,7 +1160,7 @@
</para>
<para>
Previously the presence of non-updatable columns such as
Previously the presence of non-updatable output columns such as
expressions, literals, and function calls prevented automatic
updates. Now <command>INSERT</>s, <command>UPDATE</>s and
<command>DELETE</>s are supported, provided that they do not
......@@ -1186,12 +1172,12 @@
<para>
Allow control over whether <command>INSERT</>s and
<command>UPDATE</>s can add rows to an auto-updatable view that
would no longer appear in the view (Dean Rasheed)
would not appear in the view (Dean Rasheed)
</para>
<para>
This is controlled with the new <link
linkend="SQL-CREATEVIEW"><literal>WITH CHECK OPTION</></link>.
This is controlled with the new <xref linkend="SQL-CREATEVIEW">
clause <literal>WITH CHECK OPTION</>.
</para>
</listitem>
......@@ -1215,96 +1201,89 @@
<listitem>
<para>
Allow triggers on <link linkend="SQL-CREATEFOREIGNTABLE">foreign
Support triggers on <link linkend="SQL-CREATEFOREIGNTABLE">foreign
tables</> (Ronan Dunklau)
</para>
</listitem>
<listitem>
<para>
Fix <command>DROP IF EXISTS</> to more consistently not error
for non-existent objects (Pavel Stehule, Dean Rasheed)
Allow moving groups of objects from one tablespace to another
using <xref linkend="SQL-ALTERTABLESPACE"> ... <literal>MOVE</>
(Stephen Frost)
</para>
</listitem>
<listitem>
<para>
Improve how system-level relations are designated (Andres Freund,
Robert Haas)
Allow changing foreign key constraint deferrability
via <xref linkend="SQL-ALTERTABLE"> ... <literal>ALTER
CONSTRAINT</> (Simon Riggs)
</para>
</listitem>
<listitem>
<para>
Previously, relations once moved into the system catalog schema could
no longer be modified or dropped.
Reduce lock strength for some <xref linkend="SQL-ALTERTABLE">
commands
(Simon Riggs, Noah Misch, Robert Haas)
</para>
</listitem>
<listitem>
<para>
Allow <link linkend="SQL-ALTERTABLESPACE"><command>ALTER
TABLESPACE</></link> options to be also set by <link
linkend="SQL-CREATETABLESPACE"><command>CREATE TABLESPACE</></link>
(Vik Fearing)
Specifically, <literal>VALIDATE CONSTRAINT</>, <literal>CLUSTER
ON</>, <literal>SET WITHOUT CLUSTER</>, <literal>ALTER COLUMN
SET STATISTICS</>, <literal>ALTER COLUMN</> <literal>SET</>
<option>(attribute_option)</>, <literal>ALTER COLUMN RESET</>
<option>(attribute_option)</> no longer require <literal>ACCESS
EXCLUSIVE</> locks.
</para>
</listitem>
<listitem>
<para>
Allow <link linkend="SQL-CREATEAGGREGATE"><command>CREATE
AGGREGATE</></link> to supply the size of the aggregate's
transition state data (Hadi Moshayedi)
Allow tablespace options to be set
in <xref linkend="SQL-CREATETABLESPACE"> (Vik Fearing)
</para>
<para>
This allows the optimizer to better estimate how much memory will be
used by aggregates.
Formerly these options could only be set
via <xref linkend="SQL-ALTERTABLESPACE">.
</para>
</listitem>
</itemizedlist>
<sect4>
<title><command>ALTER</></title>
<itemizedlist>
<listitem>
<para>
Allow moving groups of objects from one tablespace to another
using <link linkend="SQL-ALTERTABLESPACE"><command>ALTER
TABLESPACE</></link> ... <literal>MOVE</> (Stephen Frost)
Allow <xref linkend="SQL-CREATEAGGREGATE"> to define the estimated
size of the aggregate's transition state data (Hadi Moshayedi)
</para>
<para>
Proper use of this feature allows the planner to better estimate
how much memory will be used by aggregates.
</para>
</listitem>
<listitem>
<para>
Allow changing foreign key constraint deferrability via <link
linkend="SQL-ALTERTABLE"><command>ALTER TABLE</></link>
... <literal>ALTER CONSTRAINT</> (Simon Riggs)
Fix <command>DROP IF EXISTS</> to avoid errors for non-existent
objects in more cases (Pavel Stehule, Dean Rasheed)
</para>
</listitem>
<listitem>
<para>
Reduce lock levels of some <link
linkend="SQL-ALTERTABLE"><command>ALTER TABLE</></link> commands
(Simon Riggs, Noah Misch, Robert Haas)
Improve how system relations are identified (Andres Freund,
Robert Haas)
</para>
<para>
Specifically, <literal>VALIDATE CONSTRAINT</>, <literal>CLUSTER
ON</>, <literal>SET WITHOUT CLUSTER</>, <literal>ALTER COLUMN
SET STATISTICS</>, <literal>ALTER COLUMN</> <literal>SET</>
<option>(attribute_option)</>, <literal>ALTER COLUMN RESET</>
<option>(attribute_option)</> no longer require <literal>ACCESS
EXCLUSIVE</> locks.
Previously, relations once moved into the <literal>pg_catalog</>
schema could no longer be modified or dropped.
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
......@@ -1321,7 +1300,7 @@
<para>
The line <emphasis>segment</> data type (<link
linkend="datatype-lseg"><type>LSEG</></link>) has always been
linkend="datatype-lseg"><type>lseg</></link>) has always been
fully supported. The previous <type>line</> data type (enabled
only via a compile-time option) is not binary or dump-compatible.
</para>
......@@ -1329,7 +1308,7 @@
<listitem>
<para>
Add <link linkend="datatype-pg-lsn"><type>PG_LSN</></link>
Add <link linkend="datatype-pg-lsn"><type>pg_lsn</></link>
data type to represent a <acronym>WAL</> log sequence number
(<acronym>LSN</>) (Robert Haas, Michael Paquier)
</para>
......@@ -1338,8 +1317,8 @@
<listitem>
<para>
Allow single-point <link
linkend="datatype-polygon"><type>POLYGON</></link>s to be converted
to <link linkend="datatype-circle"><type>CIRCLE</></link>s
linkend="datatype-polygon"><type>polygon</></link>s to be converted
to <link linkend="datatype-circle"><type>circle</></link>s
(Bruce Momjian)
</para>
</listitem>
......@@ -1347,15 +1326,15 @@
<listitem>
<para>
Allow 5+ digit years for non-<acronym>ISO</> <link
linkend="datatype-datetime"><type>TIMESTAMP</></link> and
<type>DATE</> strings, where appropriate (Bruce Momjian)
linkend="datatype-datetime"><type>timestamp</></link> and
<type>date</> strings, where appropriate (Bruce Momjian)
</para>
</listitem>
<listitem>
<para>
Add checks for overflow/underflow of <link
linkend="datatype-datetime"><type>INTERVAL</></link> values
linkend="datatype-datetime"><type>interval</></link> values
(Bruce Momjian)
</para>
</listitem>
......@@ -1363,23 +1342,25 @@
</itemizedlist>
<sect4>
<title><link linkend="datatype-json"><type>JSON</></link></title>
<title><link linkend="datatype-json"><acronym>JSON</></link></title>
<itemizedlist>
<listitem>
<para>
Add structured (non-text) data type (<link
linkend="datatype-json"><type>jsonb</></link>) for storing
JSON data (Oleg Bartunov, Teodor Sigaev, Alexander
Korotkov, Peter Geoghegan, and Andrew Dunstan)
Add <link linkend="datatype-json"><type>jsonb</></link>, a more
capable and efficient data type for for storing <acronym>JSON</> data
(Oleg Bartunov, Teodor Sigaev, Alexander
Korotkov, Peter Geoghegan, Andrew Dunstan)
</para>
<para>
This allows for faster access to values in the JSON
document and faster and more useful indexing of JSON.
Scalar values in <type>jsonb</> documents are typed as appropriate
scalar SQL types.
This new type allows faster access to values in a JSON
document and faster and more useful indexing of JSON columns.
Scalar values in <type>jsonb</> documents are stored as appropriate
scalar SQL types, and the JSON document structure is pre-parsed
rather than being stored as text as in the original <type>json</>
data type.
</para>
</listitem>
......@@ -1412,7 +1393,6 @@
</sect3>
<sect3>
<title>Functions</title>
......@@ -1422,12 +1402,13 @@
<para>
Add <link
linkend="functions-datetime-delay"><function>pg_sleep_for(interval)</></link>
and <function>pg_sleep_until(timestamp)</> to specify sophisticated
delays (Vik Fearing, Julien Rouhaud)
and <function>pg_sleep_until(timestamp)</> to specify
delays more flexibly (Vik Fearing, Julien Rouhaud)
</para>
<para>
<function>pg_sleep()</> only supports delays specified in seconds.
The existing <function>pg_sleep()</> function only supports delays
specified in seconds.
</para>
</listitem>
......@@ -1468,28 +1449,29 @@
</para>
<para>
These functions are prefixed with <literal>make_</>,
These functions' names are prefixed with <literal>make_</>,
e.g. <link linkend="functions-datetime-table"><function>make_date()</></link>.
</para>
</listitem>
<listitem>
<para>
Have <link
linkend="functions-formatting-table"><function>to_char(<literal>TZ</>)</></link>
return the proper value for constant time zone offsets (Tom Lane)
Make <link
linkend="functions-formatting-table"><function>to_char()</></link>'s
<literal>TZ</> format specifier return a useful value for simple
numeric time zone offsets (Tom Lane)
</para>
<para>
Previously, <literal>to_char(CURRENT_TIMESTAMP, 'TZ')</> returned
NULL if the <literal>TIME ZONE</> was set to a constant like
<literal>-4</>.
an empty string if the <literal>timezone</> was set to a constant
like <literal>-4</>.
</para>
</listitem>
<listitem>
<para>
Add timezone offset output option <literal>OF</> to <link
Add timezone offset format specifier <literal>OF</> to <link
linkend="functions-formatting-table"><function>to_char()</></link>
(Bruce Momjian)
</para>
......@@ -1503,6 +1485,19 @@
</para>
</listitem>
<listitem>
<para>
Tighten validity checking for Unicode code points in <link
linkend="functions-string-other"><function>chr(int)</></link>
(Tom Lane)
</para>
<para>
This function now only accepts values that are valid UTF8 characters
according to RFC 3629.
</para>
</listitem>
</itemizedlist>
<sect4>
......@@ -1514,7 +1509,7 @@
<para>
Add functions for looking up objects in <structname>pg_class</>,
<structname>pg_proc</>, <structname>pg_type</>, and
<structname>pg_operator</> which do not generate errors for
<structname>pg_operator</> that do not generate errors for
non-existent objects (Yugo Nagata, Nozomi Anzai,
Robert Haas)
</para>
......@@ -1522,8 +1517,9 @@
<para>
For example, <link
linkend="functions-info-catalog-table"><function>to_regclass()</></link>
does lookups of <structname>pg_class</> and returns NULL for
non-existent objects.
does a lookup in <structname>pg_class</> similarly to
the <type>regclass</> input function, but it returns NULL for a
non-existent object instead of failing.
</para>
</listitem>
......@@ -1531,30 +1527,28 @@
<para>
Add function <link
linkend="functions-admin-dblocation"><function>pg_filenode_relation()</></link>
to allow for more efficient lookup of relation names from filenodes (Andres
Freund)
to allow for more efficient lookup of relation names from filenodes
(Andres Freund)
</para>
</listitem>
<listitem>
<para>
Add <link
linkend="information-schema"><structname>information_schema</></link>
column <link
linkend="infoschema-parameters"><structfield>parameters.parameter_default</></link>
(Peter Eisentraut)
Add <structfield>parameter_default</> column to <link
linkend="infoschema-parameters"><structname>information_schema.parameters</></link>
view (Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Have <link
linkend="infoschema-schemata"><structfield>information_schema.schemata</></link>
show all accessible schema (Peter Eisentraut)
Make <link
linkend="infoschema-schemata"><structname>information_schema.schemata</></link>
show all accessible schemas (Peter Eisentraut)
</para>
<para>
Previously it only showed <emphasis>owned</> schemas.
Previously it only showed schemas owned by the current user.
</para>
</listitem>
......@@ -1569,20 +1563,7 @@
<listitem>
<para>
Add aggregates <link
linkend="functions-orderedset-table"><function>percentile_cont()</></link>,
<function>percentile_disc()</>, <link
linkend="functions-hypothetical-table"><function>rank()</></link>,
<function>dense_rank()</>, <function>percent_rank()</>,
<function>cume_dist()</>, and <link
linkend="functions-orderedset-table"><function>mode()</></link>
(Atri Sharma, Andrew Gierth)
</para>
</listitem>
<listitem>
<para>
Add control over which values are passed
Add control over which rows are passed
into aggregate functions using the <link
linkend="syntax-aggregates"><literal>FILTER</></link> clause
(David Fetter)
......@@ -1595,28 +1576,36 @@
linkend="syntax-aggregates"><literal>WITHIN GROUP</></link>)
aggregates (Atri Sharma, Andrew Gierth, Tom Lane)
</para>
</listitem>
<listitem>
<para>
This allows aggregates that require sorted input.
Add aggregates <link
linkend="functions-orderedset-table"><function>percentile_cont()</></link>,
<function>percentile_disc()</>, <function>mode()</>, <link
linkend="functions-hypothetical-table"><function>rank()</></link>,
<function>dense_rank()</>, <function>percent_rank()</>, and
<function>cume_dist()</>
(Atri Sharma, Andrew Gierth)
</para>
</listitem>
<listitem>
<para>
Allow polymorphic aggregates to have non-polymorphic state data
types (Tom Lane)
</para>
<para>
This allows the declaration of aggregates like the built-in
aggregate <function>array_agg()</> in SQL.
Support <link
linkend="xfunc-sql-variadic-functions"><literal>VARIADIC</></link>
aggregate functions (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Allow <link
linkend="xfunc-sql-variadic-functions"><literal>VARIADIC</></link>
aggregate functions (Tom Lane)
Allow polymorphic aggregates to have non-polymorphic state data
types (Tom Lane)
</para>
<para>
This allows proper declaration of aggregates like the built-in
aggregate <function>array_agg()</> in SQL.
</para>
</listitem>
......@@ -1640,13 +1629,14 @@
<listitem>
<para>
Convert <link linkend="datatype-numeric"><type>NUMERIC</></link>s to
<type>decimal</> values in <link linkend="plpython">PL/Python</link>
Convert <link linkend="datatype-numeric"><type>numeric</></link>
values to <type>decimal</> in <link linkend="plpython">PL/Python</link>
(Szymon Guz, Ronan Dunklau)
</para>
<para>
Previously these were converted to <type>float</>s.
Previously such values were converted to Python <type>float</> values,
risking loss of precision.
</para>
</listitem>
......@@ -1711,27 +1701,19 @@
<para>
Make libpq's <link
linkend="libpq-pqconndefaults"><function>PQconndefaults()</></link>
ignore invalid service files (Steve Singer, Bruce Momjian)
function ignore invalid service files (Steve Singer, Bruce Momjian)
</para>
<para>
Previously it returned NULL.
Previously it returned NULL if an incorrect service file was
encountered.
</para>
</listitem>
<listitem>
<para>
Allow libpq to support <acronym>TLS</> versions beyond
<literal>TLSv1</> (Marko Kreen)
</para>
</listitem>
<listitem>
<para>
Document that libpq's <link
linkend="libpq-pqclientencoding"><function>PQclientEncoding()</></link>
returns <literal>-1</> for an encoding lookup failure (Bruce
Momjian)
Accept <acronym>TLS</> protocol versions beyond <literal>TLSv1</>
in libpq (Marko Kreen)
</para>
</listitem>
......@@ -1746,15 +1728,14 @@
<listitem>
<para>
Add <link
linkend="APP-CREATEUSER"><application>createuser</></link>
<option>-g</> to specify role membership (Chistopher Browne)
Add <xref linkend="APP-CREATEUSER"> option <option>-g</>
to specify role membership (Chistopher Browne)
</para>
</listitem>
<listitem>
<para>
Add <link linkend="APP-VACUUMDB"><application>vacuumdb</></link>
Add <xref linkend="APP-VACUUMDB">
option <option>--analyze-in-stages</> to analyze in stages of
increasing granularity (Peter Eisentraut)
</para>
......@@ -1766,61 +1747,64 @@
<listitem>
<para>
Allow <link linkend="pgxlogdump"><application>pg_xlogdump</></link>
to report a live log stream with <option>--follow</> (Heikki
Linnakangas)
Make <xref linkend="APP-PGRESETXLOG"> with option <option>-n</>
output current and potentially changed values (Rajeev Rastogi)
</para>
</listitem>
<listitem>
<para>
Have <link linkend="APP-PGRESETXLOG"><command>pg_resetxlog
-n</></link> output current and potentially changed values
(Rajeev Rastogi)
Make <xref linkend="app-initdb"> throw error for incorrect locale
settings, rather than silently falling back to a default choice
(Tom Lane)
</para>
</listitem>
<listitem>
<para>
Allow <function>sizeof()</> in <link linkend="ecpg">ECPG</link>
C array definitions (Michael Meskes)
Make <xref linkend="app-pg-ctl"> return exit code <literal>4</> for
an inaccessible data directory (Amit Kapila, Bruce Momjian)
</para>
</listitem>
<listitem>
<para>
Have <link linkend="ecpg">ECPG</link> properly handle nesting
requirements in C and <acronym>SQL</> mode for C-style comments
(Michael Meskes)
This behavior more closely matches the Linux Standard Base
(<acronym>LSB</>) Core Specification.
</para>
</listitem>
<listitem>
<para>
Have <link linkend="app-pg-ctl"><application>pg_ctl</></link>
return <literal>4</> for an inaccessible data directory
specification (Amit Kapila, Bruce Momjian)
On Windows, ensure that a non-absolute <option>-D</> path
specification is interpreted relative
to <xref linkend="app-pg-ctl">'s current directory
(Kumar Rajeev Rastogi)
</para>
<para>
Previously it would be interpreted relative to whichever directory
the underlying Windows service was started in.
</para>
</listitem>
<listitem>
<para>
This more closely matches the Linux Standard Base (<acronym>LSB</>)
Core Specification.
Allow <function>sizeof()</> in <link linkend="ecpg">ECPG</link>
C array definitions (Michael Meskes)
</para>
</listitem>
<listitem>
<para>
On Windows, interpret <link
linkend="app-pg-ctl"><application>pg_ctl</></link>'s non-absolute
path <option>-D</> directories relative to <application>pg_ctl</>'s
current directory (Kumar Rajeev Rastogi)
Make <link linkend="ecpg">ECPG</link> properly handle nesting
of C-style comments in both C and <acronym>SQL</> text
(Michael Meskes)
</para>
</listitem>
</itemizedlist>
<sect4>
<title><link linkend="APP-PSQL"><application>psql</></link></title>
<title><xref linkend="APP-PSQL"></title>
<itemizedlist>
......@@ -1834,7 +1818,7 @@
<listitem>
<para>
Suppress "No rows" in <application>psql</> <link
Suppress <quote>No rows</quote> output in <application>psql</> <link
linkend="APP-PSQL-meta-commands"><option>expanded</></link>
mode when the footer is disabled (Bruce Momjian)
</para>
......@@ -1842,7 +1826,7 @@
<listitem>
<para>
Allow Control-C to abort <application>psql</> hung at connection
Allow Control-C to abort <application>psql</> when hung at connection
startup (Peter Eisentraut)
</para>
</listitem>
......@@ -1856,39 +1840,39 @@
<listitem>
<para>
Have <application>psql</> <command>\db+</> show tablespace options
Make <application>psql</> <command>\db+</> show tablespace options
(Magnus Hagander)
</para>
</listitem>
<listitem>
<para>
Have <application>psql</> <command>\do+</> display the functions
Make <application>psql</> <command>\do+</> display the functions
which implement the operators (Marko Tiikkaja)
</para>
</listitem>
<listitem>
<para>
Have <application>psql</> <command>\d+</> output an
<literal>OID</> line only if an <literal>oid</literal> column exists in a table
(Bruce Momjian)
Make <application>psql</> <command>\d+</> output an
<literal>OID</> line only if an <literal>oid</literal> column
exists in a table (Bruce Momjian)
</para>
<para>
Previously, the presence or absence of an <literal>oid</literal> column was always
reported.
Previously, the presence or absence of an <literal>oid</literal>
column was always reported.
</para>
</listitem>
<listitem>
<para>
Have <command>\d</> show disabled system triggers (Bruce
Make <command>\d</> show disabled system triggers (Bruce
Momjian)
</para>
<para>
Previously if you disabled all triggers, only user triggers
Previously, if you disabled all triggers, only user triggers
would show as disabled.
</para>
</listitem>
......@@ -1902,9 +1886,9 @@
<listitem>
<para>
Output the row count at the end of
<application>psql</> <command>\copy</> just like <link
linkend="SQL-COPY"><command>COPY</></link> (Kumar Rajeev Rastogi)
Output the row count at the end
of <application>psql</> <command>\copy</> just
like <xref linkend="SQL-COPY"> (Kumar Rajeev Rastogi)
</para>
</listitem>
......@@ -1944,12 +1928,13 @@
<listitem>
<para>
In <application>psql</>, output the written history file name
(<command>\s</>) without adding an absolute path prefix (Tom Lane)
In <application>psql</>, display the history file name written by
<command>\s</> without converting it to an absolute path (Tom Lane)
</para>
<para>
The previous output was inconsistent.
The code previously attempted to convert a relative file name to
an absolute path for display, but frequently got it wrong.
</para>
</listitem>
......@@ -1960,36 +1945,35 @@
</sect4>
<sect4>
<title><link linkend="APP-PGDUMP"><application>pg_dump</></link></title>
<title><xref linkend="APP-PGDUMP"></title>
<itemizedlist>
<listitem>
<para>
Allow <link
linkend="APP-PGRESTORE"><application>pg_restore</></link> options
Allow <xref linkend="APP-PGRESTORE"> options
<option>-I</>, <option>-P</>, <option>-T</> and <option>-n</>
to be specified multiple times (Heikki Linnakangas)
</para>
<para>
This allows multiple restore object to be specified.
This allows multiple objects to be restored in one operation.
</para>
</listitem>
<listitem>
<para>
Add <literal>IF EXISTS</> clauses when removing old objects during
dump and restore (Pavel Stehule)
Optionally add <literal>IF EXISTS</> clauses to the <command>DROP</>
commands emitted when removing old objects during a restore (Pavel
Stehule)
</para>
<para>
This suppresses errors when removing old objects.
The new <option>--if-exists</> option to <link
linkend="APP-PGDUMP"><application>pg_dump</></link>, <link
linkend="APP-PG-DUMPALL"><application>pg_dumpall</></link>, and
<link linkend="APP-PGRESTORE"><application>pg_restore</></link>
is only available when <option>--clean</> is also specified.
This change prevents unnecessary errors when removing old objects.
The new <option>--if-exists</> option
for <xref linkend="APP-PGDUMP">, <xref linkend="APP-PG-DUMPALL">,
and <xref linkend="APP-PGRESTORE"> is only available
when <option>--clean</> is also specified.
</para>
</listitem>
......@@ -1998,7 +1982,7 @@
</sect4>
<sect4>
<title><link linkend="app-pgbasebackup"><application>pg_basebackup</></link></title>
<title><xref linkend="app-pgbasebackup"></title>
<itemizedlist>
......@@ -2024,7 +2008,7 @@
<listitem>
<para>
Allow network-streams base backups to be throttled (Antonin Houska)
Allow network-stream base backups to be throttled (Antonin Houska)
</para>
<para>
......@@ -2046,25 +2030,29 @@
<listitem>
<para>
Improve the way tuples are frozen, to preserve forensic information
Improve the way tuples are frozen to preserve forensic information
(Robert Haas, Andres Freund)
</para>
<para>
Code that inspects tuple flag bits will need to be modified.
This change removes the main objection to freezing tuples as soon
as possible. Code that inspects tuple flag bits will need to be
modified.
</para>
</listitem>
<listitem>
<para>
No longer require function prototypes for function marked with the
No longer require function prototypes for functions marked with the
<link linkend="xfunc-c"><function>PG_FUNCTION_INFO_V1</></link>
macro (Peter Eisentraut)
</para>
<para>
This eliminates needless boilerplate prototypes whose lack
generates compiler warnings.
This change eliminates the need to write boilerplate prototypes.
Note that the <function>PG_FUNCTION_INFO_V1</> macro must appear
before the corresponding function definition to avoid compiler
warnings.
</para>
</listitem>
......@@ -2082,8 +2070,8 @@
<listitem>
<para>
Add <acronym>API</> for memory allocations over one gigabyte (Noah
Misch)
Add an <acronym>API</> to allow memory allocations over one gigabyte
(Noah Misch)
</para>
</listitem>
......@@ -2096,8 +2084,8 @@
<listitem>
<para>
Add <function>printf()</> modifier "z" to specify <type>size_t</>
values (Andres Freund)
Support <function>printf()</> size modifier <literal>z</> to
print <type>size_t</> values (Andres Freund)
</para>
</listitem>
......@@ -2146,7 +2134,7 @@
<listitem>
<para>
Reduce the number of semaphores required by
<option>--disable-spinlocks</> (Robert Haas)
<option>--disable-spinlocks</> builds (Robert Haas)
</para>
</listitem>
......@@ -2167,8 +2155,8 @@
<listitem>
<para>
Add make targets <option>check-tests</> and
<option>installcheck-tests</> which allow per-test specification
(Andrew Dunstan)
<option>installcheck-tests</>, which allow selection of individual
tests to be run (Andrew Dunstan)
</para>
</listitem>
......@@ -2178,7 +2166,7 @@
</para>
<para>
Its functionality is now done by the default build rules.
The default build rules now include all the formerly-optional tests.
</para>
</listitem>
......@@ -2197,7 +2185,7 @@
<listitem>
<para>
Add configure flag that appends custom text to the
Add a <application>configure</> flag that appends custom text to the
<envar>PG_VERSION</> string (Oskari Saarenmaa)
</para>
......@@ -2214,7 +2202,7 @@
<listitem>
<para>
Various security and sanity fixes reported by the
Various minor security and sanity fixes reported by the
<productname>Coverity</> scanner (Stephen Frost)
</para>
</listitem>
......@@ -2228,7 +2216,7 @@
<listitem>
<para>
Improve <application>Emacs</> configuration file
Improve sample <application>Emacs</> configuration file
<filename>emacs.samples</> (Peter Eisentraut)
</para>
......@@ -2239,26 +2227,28 @@
<listitem>
<para>
Allow <application>pgindent</> to be supplied a command-line list
Allow <application>pgindent</> to accept a command-line list
of typedefs (Bruce Momjian)
</para>
<para>
<application>Pgindent</> is also now smarter about blank lines
<application>pgindent</> is also now smarter about blank lines
around preprocessor conditionals.
</para>
</listitem>
<listitem>
<para>
Avoid most uses of <command>dlltool</command> in <productname>Cygwin</> and
Avoid most uses of <command>dlltool</command>
in <productname>Cygwin</> and
<productname>Mingw</> builds (Marco Atzeri, Hiroshi Inoue)
</para>
</listitem>
<listitem>
<para>
Allow client-only installs for <acronym>MSVC</> (Windows) builds (MauMau)
Support client-only installs in <acronym>MSVC</> (Windows) builds
(MauMau)
</para>
</listitem>
......@@ -2273,80 +2263,94 @@
<listitem>
<para>
Add <link linkend="pgprewarm"><application>pg_prewarm</></link>
extension to preload relation data into the shared buffer cache
(Robert Haas)
Add <xref linkend="pgprewarm"> extension to preload relation data
into the shared buffer cache at server start (Robert Haas)
</para>
<para>
This is useful at server start to produce more consistent
performance.
This allows reaching full operating performance more quickly.
</para>
</listitem>
<listitem>
<para>
Add <acronym>UUID</> random number generator
<function>gen_random_uuid()</> to <link
linkend="pgcrypto"><application>pgcrypto</></link> (Oskari
Saarenmaa)
<function>gen_random_uuid()</> to <xref linkend="pgcrypto">
(Oskari Saarenmaa)
</para>
<para>
This allows the creation of version 4 <acronym>UUID</>s without
requiring the installation of <literal>uuid-ossp</literal>.
This allows creation of version 4 <acronym>UUID</>s without
requiring installation of <xref linkend="uuid-ossp">.
</para>
</listitem>
<listitem>
<para>
Add option to include trigger execution time to <link
linkend="auto-explain"><application>auto_explain</></link>
(Horiguchi Kyotaro)
Allow <xref linkend="uuid-ossp"> to work with
the <systemitem>BSD</> or <systemitem>e2fsprogs</> UUID libraries,
not only the <systemitem>OSSP</> UUID library (Matteo Beccati)
</para>
<para>
This improves the <application>uuid-ossp</> module's portability
since it no longer has to have the increasingly-obsolete OSSP
library. The module's name is now rather a misnomer, but we won't
change it.
</para>
</listitem>
<listitem>
<para>
Fix <link linkend="pgstattuple"><application>pgstattuple</></link>
to not report rows from uncommitted transactions as dead
(Robert Haas)
Add option to <xref linkend="auto-explain"> to include trigger
execution time (Horiguchi Kyotaro)
</para>
</listitem>
<listitem>
<para>
Have <link linkend="pgstattuple"><application>pgstattuple</></link>
functions use <type>regclass</type>-type arguments (Satoshi Nagayasu)
Fix <xref linkend="pgstattuple"> to not report rows from
uncommitted transactions as dead (Robert Haas)
</para>
</listitem>
<listitem>
<para>
Make <xref linkend="pgstattuple"> functions
use <type>regclass</type>-type arguments (Satoshi Nagayasu)
</para>
<para>
While <type>text</type>-type arguments are still supported, they
may be removed in a future major release.
</para>
</listitem>
<listitem>
<para>
While <type>text</type>-type arguments are still supported, they will be
removed in a later major release.
Improve consistency of <xref linkend="pgrowlocks"> output to honor
snapshot rules more consistently (Robert Haas)
</para>
</listitem>
<listitem>
<para>
Improve consistency of <link
linkend="pgrowlocks"><application>pgrowlocks</></link> output to
honor snapshot rules more consistently (Robert Haas)
Improve <xref linkend="pgtrgm">'s choice of trigrams for indexed
regular expression searches by discouraging the selection of
trigrams containing whitespace (Alexander Korotkov)
</para>
</listitem>
<listitem>
<para>
Improve <link linkend="pgtrgm"><application>pg_trgm</>'s</link>
generation of trigrams for indexed regular expression searches by
discouraging the indexing of trigrams containing whitespace (Alexander
Korotkov)
Allow <xref linkend="pgxlogdump"> to report a live log stream
with <option>--follow</> (Heikki Linnakangas)
</para>
</listitem>
<listitem>
<para>
Store <link linkend="cube"><type>cube</></link> data more compactly
(Stas Kelvich)
Store <xref linkend="cube"> data more compactly (Stas Kelvich)
</para>
<para>
......@@ -2357,30 +2361,29 @@
<listitem>
<para>
Reduce <link linkend="vacuumlo"><application>vacuumlo</></link>
client-side memory usage by using a cursor (Andrew Dunstan)
Reduce <xref linkend="vacuumlo"> client-side memory usage by using
a cursor (Andrew Dunstan)
</para>
</listitem>
<listitem>
<para>
Dramatically reduce memory consumption in <link
linkend="pgupgrade"><application>pg_upgrade</></link> (Bruce
Momjian)
Dramatically reduce memory consumption
in <xref linkend="pgupgrade"> (Bruce Momjian)
</para>
</listitem>
<listitem>
<para>
Pass <link linkend="pgupgrade"><application>pg_upgrade</></link>
user names (<option>-U</>) to analyze scripts (Bruce Momjian)
Pass <xref linkend="pgupgrade"> user name (<option>-U</> option) to
analyze scripts (Bruce Momjian)
</para>
</listitem>
</itemizedlist>
<sect4>
<title><link linkend="pgbench"><application>pgbench</></link></title>
<title><xref linkend="pgbench"></title>
<itemizedlist>
......@@ -2397,20 +2400,22 @@
<listitem>
<para>
Add <application>pgbench</> option (<option>--rate</>) to control
the transaction rate (Fabien Coelho)
Add long option names to <application>pgbench</> (Fabien Coelho)
</para>
</listitem>
<listitem>
<para>
Add <option>--progress</> output option to <application>pgbench</> (Fabien Coelho)
Add <application>pgbench</> option <option>--rate</> to control
the transaction rate (Fabien Coelho)
</para>
</listitem>
<listitem>
<para>
Add long options to <application>pgbench</> (Fabien Coelho)
Add <application>pgbench</> option <option>--progress</> to
print periodic progress reports
(Fabien Coelho)
</para>
</listitem>
......@@ -2419,19 +2424,19 @@
</sect4>
<sect4>
<title><link linkend="pgstatstatements"><application>pg_stat_statements</></link></title>
<title><xref linkend="pgstatstatements"></title>
<itemizedlist>
<listitem>
<para>
Have <application>pg_stat_statements</> use a flat file for query
text storage (Peter Geoghegan)
Make <application>pg_stat_statements</> use a file, rather than
shared memory, for query text storage (Peter Geoghegan)
</para>
<para>
This removes the limitation on query text length, and allows a
higher default number of unique statements to be tracked.
This removes the previous limitation on query text length, and
allows a higher number of unique statements to be tracked by default.
</para>
</listitem>
......@@ -2451,7 +2456,15 @@
<para>
This allows monitoring tools to only fetch query text for newly
created entries, as reported in <structfield>queryid</>.
created entries, improving performance for repeated querying of the
statistics.
</para>
</listitem>
<listitem>
<para>
Save the statistics file into <filename>$PGDATA/pg_stat</> at server
shutdown, rather than <filename>$PGDATA/global</> (Fujii Masao)
</para>
</listitem>
......
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