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Postgres FD Implementation
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Abuhujair Javed
Postgres FD Implementation
Commits
818ac847
Commit
818ac847
authored
Nov 25, 2006
by
Peter Eisentraut
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Correct misspellings of kB.
parent
b12add99
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12 deletions
+12
-12
doc/src/sgml/config.sgml
doc/src/sgml/config.sgml
+2
-2
doc/src/sgml/runtime.sgml
doc/src/sgml/runtime.sgml
+3
-3
doc/src/sgml/storage.sgml
doc/src/sgml/storage.sgml
+5
-5
doc/src/sgml/wal.sgml
doc/src/sgml/wal.sgml
+2
-2
No files found.
doc/src/sgml/config.sgml
View file @
818ac847
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.9
6 2006/11/21 01:23:37 tgl
Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.9
7 2006/11/25 22:44:48 petere
Exp $ -->
<chapter Id="runtime-config">
<title>Server Configuration</title>
...
...
@@ -847,7 +847,7 @@ SET ENABLE_SEQSCAN TO OFF;
margin is needed because the stack depth is not checked in every
routine in the server, but only in key potentially-recursive routines
such as expression evaluation. The default setting is
2048
K
B (two megabytes), which is conservatively small and unlikely
2048
k
B (two megabytes), which is conservatively small and unlikely
to risk crashes. However, it may be too small to allow execution
of complex functions.
Only superusers can change this setting.
...
...
doc/src/sgml/runtime.sgml
View file @
818ac847
<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.37
3 2006/09/16 00:30:15 momjian
Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.37
4 2006/11/25 22:44:48 petere
Exp $ -->
<chapter Id="runtime">
<title>Operating System Environment</title>
...
...
@@ -680,7 +680,7 @@ psql: could not connect to server: No such file or directory
options "SHMALL=8192"
options "SHMMAX=\(SHMALL*PAGE_SIZE\)"
</programlisting>
<varname>SHMALL</> is measured in 4
K
B pages, so a value of
<varname>SHMALL</> is measured in 4
k
B pages, so a value of
1024 represents 4 MB of shared memory. Therefore the above increases
the maximum shared memory area to 32 MB.
For those running 4.3 or later, you will probably also need to increase
...
...
@@ -921,7 +921,7 @@ kern.sysv.shmall=1024
</para>
<para>
<varname>SHMALL</> is measured in 4
K
B pages on this platform.
<varname>SHMALL</> is measured in 4
k
B pages on this platform.
</para>
<para>
...
...
doc/src/sgml/storage.sgml
View file @
818ac847
<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.1
1 2006/06/18 15:38:36
petere Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.1
2 2006/11/25 22:44:48
petere Exp $ -->
<chapter id="storage">
...
...
@@ -188,7 +188,7 @@ Oversized-Attribute Storage Technique).
<para>
<productname>PostgreSQL</productname> uses a fixed page size (commonly
8
Kb
), and does not allow tuples to span multiple pages. Therefore, it is
8
kB
), and does not allow tuples to span multiple pages. Therefore, it is
not possible to store very large field values directly. To overcome
this limitation, large field values are compressed and/or broken up into
multiple physical rows. This happens transparently to the user, with only
...
...
@@ -261,7 +261,7 @@ regardless of the actual size of the represented value.
<para>
The <acronym>TOAST</> code is triggered only
when a row value to be stored in a table is wider than <literal>BLCKSZ/4</>
bytes (normally 2
Kb
). The <acronym>TOAST</> code will compress and/or move
bytes (normally 2
kB
). The <acronym>TOAST</> code will compress and/or move
field values out-of-line until the row value is shorter than
<literal>BLCKSZ/4</> bytes or no more gains can be had. During an UPDATE
operation, values of unchanged fields are normally preserved as-is; so an
...
...
@@ -328,7 +328,7 @@ containing typical HTML pages and their URLs was stored in about half of the
raw data size including the <acronym>TOAST</> table, and that the main table
contained only about 10% of the entire data (the URLs and some small HTML
pages). There was no run time difference compared to an un-<acronym>TOAST</>ed
comparison table, in which all the HTML pages were cut down to 7
Kb
to fit.
comparison table, in which all the HTML pages were cut down to 7
kB
to fit.
</para>
</sect1>
...
...
@@ -361,7 +361,7 @@ an item is a row; in an index, an item is an index entry.
<para>
Every table and index is stored as an array of <firstterm>pages</> of a
fixed size (usually 8
Kb
, although a different page size can be selected
fixed size (usually 8
kB
, although a different page size can be selected
when compiling the server). In a table, all the pages are logically
equivalent, so a particular item (row) can be stored in any page. In
indexes, the first page is generally reserved as a <firstterm>metapage</>
...
...
doc/src/sgml/wal.sgml
View file @
818ac847
<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.4
1 2006/10/23 18:10:32
petere Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.4
2 2006/11/25 22:44:48
petere Exp $ -->
<chapter id="wal">
<title>Reliability and the Write-Ahead Log</title>
...
...
@@ -313,7 +313,7 @@
<acronym>WAL</acronym> logs are stored in the directory
<filename>pg_xlog</filename> under the data directory, as a set of
segment files, normally each 16 MB in size. Each segment is divided into
pages, normally 8
K
B each. The log record headers are described in
pages, normally 8
k
B each. The log record headers are described in
<filename>access/xlog.h</filename>; the record content is dependent
on the type of event that is being logged. Segment files are given
ever-increasing numbers as names, starting at
...
...
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