< 	o Allow postgresql.conf file values to be changed via an SQL API
> 	o Allow postgresql.conf file values to be changed via an SQL
> 	  API, perhaps using SET GLOBAL

< 	* Allow server logs to be remotely read using SQL commands
151a151
> * Allow server logs to be remotely read and removed using SQL commands

place.

Alvaro Herrera

count.

Oliver Jowett

tests for the new interval->day changes. I added tests for
justify_hours() and justify_days() to interval.sql, as they take
interval input and produce interval output. If there's a more
appropriate place for them, please let me know.

Michael Glaesemann

<
> * Allow EXPLAIN to identify tables that were skipped because of
>   enable_constraint_exclusion
> * Allow EXPLAIN output to be more easily processed by scripts
760a763
> * Allow enable_constraint_exclusion to work for UPDATE and DELETE queries

<
> * Allow enable_constraint_exclusion to work for UNIONs like it does for
>   inheritance

> * Prevent inherited tables from expanding temporary subtables of other
>   sessions

Chris Browne

> * Add system view to show free space map contents
884c885
< 	o Move into the backend code
> 	o -Move into the backend code

> * Allow SELECT ... FOR UPDATE on inherited tables

< * Add TRUNCATE permission
> * Add a separate TRUNCATE permission

> * Add TRUNCATE permission
>
>   Currently only the owner can TRUNCATE a table because triggers are not
>   called, and the table is locked in exclusive mode.
>

> * Add PQescapeIdentifier() to libpq

continue to recurse after eliminating a NOT-below-a-NOT, since the
contained subexpression will now be part of the top-level AND/OR structure
and so deserves to be simplified.  The real-world impact of this is
probably minimal, since it'd require at least three levels of NOT to make
a difference, but it's still a bug.
Also remove some redundant tests for NULL subexpressions.

version.

track shared relations in a separate hashtable, so that operations done
from different databases are counted correctly.  Add proper support for
anti-XID-wraparound vacuuming, even in databases that are never connected
to and so have no stats entries.  Miscellaneous other bug fixes.
Alvaro Herrera, some additional fixes by Tom Lane.

Per report from Andrew Clark.

>
> 	   If CRC check fails during recovery, remember the page in case
> 	   a later CRC for that page properly matches.
>

Euler Taveira de Oliveira

	pg_tablespace_size
	pg_database_size
	pg_relation_size
	pg_complete_relation_size
	pg_size_pretty

Remove /contrib/dbsize.

Dave Page

new commands which may make an SPI call fail.

Alvaro Herrera

uniware

< * Consider use of open/fcntl(O_DIRECT) to minimize OS caching,
<   especially for WAL writes
> * -Consider use of open/fcntl(O_DIRECT) to minimize OS caching,
>   for WAL writes

Use O_DIRECT if available when using O_SYNC for wal_sync_method.

Also, write multiple WAL buffers out in one write() operation.

ITAGAKI Takahiro

---------------------------------------------------------------------------

> If we disable writeback-cache and use open_sync, the per-page writing
> behavior in WAL module will show up as bad result. O_DIRECT is similar
> to O_DSYNC (at least on linux), so that the benefit of it will disappear
> behind the slow disk revolution.
>
> In the current source, WAL is written as:
>     for (i = 0; i < N; i++) { write(&buffers[i], BLCKSZ); }
> Is this intentional? Can we rewrite it as follows?
>    write(&buffers[0], N * BLCKSZ);
>
> In order to achieve it, I wrote a 'gather-write' patch (xlog.gw.diff).
> Aside from this, I'll also send the fixed direct io patch (xlog.dio.diff).
> These two patches are independent, so they can be applied either or both.
>
>
> I tested them on my machine and the results as follows. It shows that
> direct-io and gather-write is the best choice when writeback-cache is off.
> Are these two patches worth trying if they are used together?
>
>
>             | writeback | fsync= | fdata | open_ | fsync_ | open_
> patch       | cache     |  false |  sync |  sync | direct | direct
> ------------+-----------+--------+-------+-------+--------+---------
> direct io   | off       |  124.2 | 105.7 |  48.3 |   48.3 |  48.2
> direct io   | on        |  129.1 | 112.3 | 114.1 |  142.9 | 144.5
> gather-write| off       |  124.3 | 108.7 | 105.4 |  (N/A) | (N/A)
> both        | off       |  131.5 | 115.5 | 114.4 |  145.4 | 145.2
>
> - 20runs * pgbench -s 100 -c 50 -t 200
>    - with tuning (wal_buffers=64, commit_delay=500, checkpoint_segments=8)
> - using 2 ATA disks:
>    - hda(reiserfs) includes system and wal.
>    - hdc(jfs) includes database files. writeback-cache is always on.
>
> ---
> ITAGAKI Takahiro

An attached patch is a small additional improvement.

This patch use appendStringInfoText instead of appendStringInfoString.
There is an overhead of PG_TEXT_GET_STR when appendStringInfoString is
executed by text type. This can be reduced by appendStringInfoText.

Atsushi Ogawa

where applicable.

There's no tab-completion for "PREPARE TRANSACTION 'xxx'" since that
would be ambigous with "PREPARE xxx AS xx".

Heikki Linnakangas