pgwn:23_avril_2007 [Communauté francophone de PostgreSQL]

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<p><strong>Nouvelles hebdomadaires de PostgreSQL - 22 Avril 2007</strong></p>
<p>Les versions corrig&eacute;es 8.2.4, 8.1.9, 8.0.13, 7.4.17 et
7.3.19 sont sorties (d&eacute;tails <a href=
"http://www.postgresql.org/about/news.791">ici (en)</a>). A vos
mises &agrave; jour...</p>
<p><strong>Les nouveaut&eacute;s des produits
d&eacute;riv&eacute;s</strong></p>
<ul>
<li>PgBouncer 1.0.7 est sorti : <a target="_blank" href=
"http://pgfoundry.org/projects/pgbouncer/">http://pgfoundry.org/projects/pgbouncer/</a></li>
<li>pgpool-II est en instance d'inclusion dans Fedora Core et EPEL
(Devrim GUNDUZ)</li>
<li>PL/Proxy 2.0.2 est sorti : <a target="_blank" href=
"http://pgfoundry.org/projects/plproxy/">http://pgfoundry.org/projects/plproxy/</a></li>
<li>Skytools 2.1.4 est sorti : <a target="_blank" href=
"http://pgfoundry.org/projects/skytools/">http://pgfoundry.org/projects/skytools/</a></li>
</ul>
<p><strong>PostgreSQL Jobs d'avril</strong></p>
<p><a target="_blank" href=
"http://archives.postgresql.org/pgsql-jobs/2007-04/threads.php">http://archives.postgresql.org/pgsql-jobs/2007-04/threads.php</a></p>
<p><strong>PostgreSQL Local</strong></p>
<p>Pour PgDay, c'est par l&agrave; : <a target="_blank" href=
"http://www.pgday.it/en/node/95">http://www.pgday.it/en/node/95</a></p>
<p>Les souscriptions sont ouvertes pour PGCon 2007 <a target=
"_blank" href=
"http://www.pgcon.org/2007/registration.php">http://www.pgcon.org/2007/registration.php</a></p>
<p><strong>PostgreSQL dans les m&eacute;dia</strong></p>
<ul>
<li>Planet PostgreSQL : <a target="_blank" href=
"http://www.planetpostgresql.org/">http://www.planetpostgresql.org/</a></li>
<li>General Bits, Archives et nouveaux articles : <a target=
"_blank" href=
"http://www.varlena.com/GeneralBits/">http://www.varlena.com/GeneralBits/</a></li>
</ul>
<p><i>PostgreSQL Weekly News vous est pr&eacute;sent&eacute; cette
semaine par David Fetter et Devrim GUNDUZ. Adaptation francophone
de St&eacute;phane Schildknecht, Guillaume de Rorthais,
C&eacute;dric Villemain...</i></p>
<p><i>Vos propositions d'informations doivent parvenir avant
dimanche minuit &agrave; david@fetter.org. Les propositions en
allemand peuvent &ecirc;tre envoy&eacute;es &agrave;
pwn@pgug.de.</i></p>
<p><strong>Correctifs appliqu&eacute;s</strong></p>
<p>Andrew Dunstan a commit&eacute; :</p>
<ul>
<li>Document new -with-libxslt build option.</li>
</ul>
<p>Peter Eisentraut a commit&eacute; :</p>
<ul>
<li>In pgsql/contrib/uuid-ossp/uuid-ossp.sql.in, make some
functions immutable. Thanks, Marko Kreen</li>
<li>Fix typo in contrib/uuid-ossp/README.uuid-ossp.</li>
<li>Joachim Wieland's patch to make configuration parameters fall
back to their default values when they are removed from the
configuration file.</li>
<li>Fix alignment of help output.</li>
<li>A new contrib module uuid-ossp for generating UUID values using
the OSSP UUID library. New configure option --with-ossp-uuid to
activate.</li>
<li>Documentation for UUID type.</li>
<li>Translation updates.</li>
</ul>
<p>Bruce Momjian a commit&eacute; :</p>
<ul>
<li>Mark TODO as done: "Allow commenting of variables in
postgresql.conf to restore them."</li>
<li>Add comment on why deadlock detection error messages only
prints numbers.</li>
<li>Add script major_release_split to simplify creating release
notes for multiple releases.</li>
<li>Add mention of checking &lt;link&gt; behavior of HISTORY.html
to release checklist.</li>
<li>Remove duplicate text in FAQ, per Magnus Hagander.</li>
<li>Release wording updates for releases 8.2.4, 8.1.9, 8.0.13,
7.4.17, 7.3.19.</li>
<li>Update FAQ to mention most recent release for releases 8.2.4,
8.1.9, 8.0.13, 7.4.17, 7.3.19.</li>
<li>Stamp releases 8.2.4, 8.1.9, 8.0.13, 7.4.17, 7.3.19.</li>
<li>Update FAQ for 8.2.4.</li>
<li>Release note updates for 8.2.4, 8.1.9, 8.0.13, 7.4.17,
7.3.19.</li>
<li>Remove tabs from SGML source files.</li>
<li>Item not done, per Pavel.</li>
<li>Update docs/error message for CSV quote/escape --- must be
ASCII. Backpatch doc change to 8.2.X.</li>
<li>Update error message for COPY with a multi-byte delimiter.</li>
<li>Document that the COPY delimiter must be an ASCII byte, rather
than a multi-byte value. It can also be a single-byte encoded
character if the client and server versions match. Backpatch to
8.2.X.</li>
<li>Mark !PL/PgSQL? TODO sub-item as done: "Add support for WITH
HOLD and SCROLL cursors."</li>
<li>Mark !PL/PgSQL? TODO sub-item as done: "Add MOVE to
cursors"</li>
<li>Add warning about TODO item.</li>
<li>Change TODO from easy to not, per Alvaro Herrera: "Set proper
permissions on non-system schemas during db creation."</li>
</ul>
<p>Magnus Hagander a commit&eacute; :</p>
<ul>
<li>Joachim Wieland's patch to fix the build for directories with
spaces in them by quoting properly.</li>
<li>Don't try to build uuid-ossp on msvc.</li>
<li>Enable building of 64-bit libpq using visual studio 8 and the
win32.mak file. Enable building with kerberos support using the
win32.mak file. Patch by Hiroshi Saito and Magnus Hagander.</li>
<li>Change default build to release, to be consistent with unix
build. Make it possible to set the default from builenv.bat. Per
request from Dave Page.</li>
<li>Silence mingw compiler warning.</li>
<li>Merlin Moncure's patch which prevents psql from writing timing
output in quiet mode.</li>
<li>Enable IPV6 for all MSVC builds, including the VC6 libpq-only
build. Per request from Hiroshi Saito.</li>
</ul>
<p>Alvaro Herrera a commit&eacute; :</p>
<ul>
<li>Silence compiler warnings, per Bruce.</li>
<li>Enable configurable log of autovacuum actions. Initial patch
from Simon Riggs, additional code and docs by me. Per
discussion.</li>
<li>Add a multi-worker capability to autovacuum. This allows
multiple worker processes to be running simultaneously. Also, now
autovacuum processes do not count towards the max_connections
limit; they are counted separately from regular processes, and are
limited by the new GUC variable autovacuum_max_workers. The
launcher now has intelligence to launch workers on each database
every autovacuum_naptime seconds, limited only on the max amount of
worker slots available. Also, the global worker I/O utilization is
limited by the vacuum cost-based delay feature. Workers are
"balanced" so that the total I/O consumption does not exceed the
established limit. This part of the patch was contributed by
ITAGAKI Takahiro.</li>
</ul>
<p>Tom Lane a commit&eacute; :</p>
<ul>
<li>Remove some of the most blatant brain-fade in the recent guc
patch (it's so nice to have a buildfarm member that actively
rejects naked uses of strcasecmp). This coding is still pretty
awful, though, since it's going to be O(N^2) in the number of guc
variables. May I direct your attention to bsearch?</li>
<li>Some further performance tweaks for planning large inheritance
trees that are mostly excluded by constraints: do the CE test a bit
earlier to save some adjust_appendrel_attrs() work on excluded
children, and arrange to use array indexing rather than rt_fetch()
to fetch RTEs in the main body of the planner. The latter is
something I'd wanted to do for awhile anyway, but seeing
list_nth_cell() as 35% of the runtime gets one's attention.</li>
<li>Avoid useless work during set_plain_rel_pathlist() when the
relation will be excluded by constraint exclusion anyway. Greg
Stark.</li>
<li>Tweak make_inh_translation_lists() to check the common case
wherein parent and child attnums are the same, before it grovels
through each and every child column looking for a name match. Saves
some time in large inheritance trees, per example from Greg
Stark.</li>
<li>Improve the way in which CatalogCacheComputeHashValue combines
multiple key values: don't throw away perfectly good hash bits, and
increase the shift distances so as to provide more separation in
the common case where some of the key values are small integers
(and so their hashes are too, because hashfunc.c doesn't try all
that hard). This reduces the runtime of SearchCatCache by a factor
of 4 in an example provided by Greg Stark, in which the planner
spends a whole lot of time searching the two-key STATRELATT cache.
It seems unlikely to hurt in other cases, but maybe we could do
even better?</li>
<li>Adjust pgstat_initstats() to avoid repeated searches of the
TabStat arrays when a relation is opened multiple times in the same
transaction. This is particularly useful for system catalogs, which
we may heap_open or index_open many times in a transaction, and it
doesn't really cost anything extra even if the rel is touched but
once. Motivated by study of an example from Greg Stark, in which
pgstat_initstats() accounted for an unreasonably large fraction of
the runtime.</li>
<li>Tweak set_rel_width() to avoid redundant executions of
getrelid(). In very large queries this accounts for a noticeable
fraction of planning time. Per an example from Greg Stark.</li>
<li>Sync timezone data with 2007e zic release.</li>
<li>Fix missed PACKAGE_STRING.</li>
<li>Fix plpgsql to avoid reference to already-freed memory when
returning a pass-by-reference data type and the RETURN statement is
within an EXCEPTION block. Bug introduced by my fix of 2007-01-28
to use per-subtransaction ExprContexts/EStates; since that wasn't
back-patched into older branches, only 8.2 and HEAD are affected.
Per report from Gary Winslow.</li>
<li>Cancel pending fsync requests during WAL replay of DROP
DATABASE, per bug report from David Darville. Back-patch as far as
8.1, which may or may not have the problem but it seems a safe
change anyway.</li>
<li>Fix condition for whether end_heap_rewrite must fsync, per
Heikki Linnakangas.</li>
<li>Don't assume rd_smgr stays open across all of a rewriteheap
operation; doing so can result in crash if an sinval reset occurs
meanwhile. I believe this explains intermittent buildfarm failures
in cluster test.</li>
<li>Rewrite choose_bitmap_and() to make it more robust in the
presence of competing alternatives for indexes to use in a bitmap
scan. The former coding took estimated selectivity as an overriding
factor, causing it to sometimes choose indexes that were much
slower to scan than ones with a slightly worse selectivity. It was
also too narrow-minded about which combinations of indexes to
consider ANDing. The rewrite makes it pay more attention to index
scan cost than selectivity; this seems sane since it's impossible
to have very bad selectivity with low cost, whereas the reverse
isn't true. Also, we now consider each index alone, as well as
adding each index to an AND-group led by each prior index, for a
total of about O(N^2) rather than O(N) combinations considered.
This makes the results much less dependent on the exact order in
which the indexes are considered. It's still a lot cheaper than an
O(2^N) exhaustive search. A prefilter step eliminates all but the
cheapest of those indexes using the same set of WHERE conditions,
to keep the effective value of N down in scenarios where the DBA
has created lots of partially-redundant indexes.</li>
<li>Fix erroneous column counts in some documentation tables. Brian
Gough.</li>
<li>Temporarily re-add derived files, in hopes of straightening out
their CVS status. And remove 'em again ...</li>
<li>Tweak clean_encoding_name() API to avoid need to cast away
const. Kris Jurka</li>
<li>Fix pg_dump to not crash if -t or a similar switch is used to
select a serial sequence for dumping without also selecting its
owning table. Make it not try to emit ALTER SEQUENCE OWNED BY in
this situation. Per report from Michael Nolan.</li>
<li>Make plancache store cursor options so it can pass them to
planner during a replan. I had originally thought this was not
necessary, but the new SPI facilities create a path whereby queries
planned with non-default options can get into the cache, so it is
necessary.</li>
<li>Support scrollable cursors (ie, 'direction' clause in FETCH) in
plpgsql. Pavel Stehule, reworked a bit by Tom.</li>
<li>Expose more cursor-related functionality in SPI: specifically,
allow access to the planner's cursor-related planning options, and
provide new FETCH/MOVE routines that allow access to the full power
of those commands. Small refactoring of planner(), pg_plan_query(),
and pg_plan_queries() APIs to make it convenient to pass the
planning options down from SPI. This is the core-code portion of
Pavel Stehule's patch for scrollable cursor support in plpgsql;
I'll review and apply the plpgsql changes separately.</li>
</ul>
<p><strong>Correctifs rejet&eacute;s (&agrave; ce
jour)</strong></p>
<p>Pas de d&eacute;ception cette semaine :-)</p>
<p><strong>Correctifs en attente</strong></p>
<ul>
<li>ITAGAKI Takahiro a envoy&eacute; un patch qui supprime certains
avertissements avec MingW.</li>
<li>Kris Jurka a envoy&eacute; un patch qui supprime un
avertissement &agrave; propos d'une constante dans
src/backend/utils/mb/encnames.c</li>
<li>Arul Shaji a propos&eacute; une nouvelle version de son
impl&eacute;mentation permettant de COPY&eacute; des sorties de
logs au format csv.</li>
<li>ITAGAKI Takahiro a propos&eacute; une autre version de son
patch de v&eacute;rification de r&eacute;partition de charge.</li>
<li>Heikki Linnakangas a envoy&eacute; un patch qui
r&eacute;concilie son pr&eacute;c&eacute;dent "HOT" patch avec les
MVCC-safe CLUSTER.</li>
<li>Pavel Stehule a envoy&eacute; un patch am&eacute;lior&eacute;
qui ajoute MOVE &agrave; !PL/PgSQL? .</li>
<li>Guillaume Lelarge a envoy&eacute; un patch de documentation qui
explique pourquoi stats_row_level doit &ecirc;tre activ&eacute; si
l'utilisateur veut pouvoir obtenir la dur&eacute;e
d'ex&eacute;cution du dernier vacuum/analyze.</li>
</ul>
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