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== Postgres Weekly News - 20 luglio 2008 ==

From: rotellaro(at)gmail(dot)com
To: pgsql-it-generale <pgsql-it-generale(at)postgresql(dot)org>
Subject: == Postgres Weekly News - 20 luglio 2008 ==
Date: 2008-07-21 13:53:31
Message-ID: a3e8e2210807210653sb790a4che305ee6034aa9524@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-it-generale
Nuovo poll: Come installi o aggiorni di solito PostgreSQL?
http://www.posgresql.org/community

Peter Eisentraut del Core Team è stato assunto come sviluppatore
PostgreSQL da Sun Microsystems.
Contemporaneamente Josh Berkus ha lasciato Sun ma non ha ancora detto
dove sta andando.

== Postgres News prodotti ==
Rilasciato check_postgres 2.0.1.
http://bucardo.org/check_postgres/

Rilasciato Code Factory 8.7 per Windows.
http://www.sqlmaestro.com/products/postgresql/codefactory/

Markus Wanner (ne Schiltknecht) ha rilasciato una patch nel CVS HEAD
per Postgres-R.
http://www.postgres-r.org/downloads/

2ndQuandrant ha reso disponibile il corso PostgreSQL Administration
con l'utilizzo di Navicat.
http://www.2ndQuadrant.com/training.htm

== Offerte di lavoro legate a PostgreSQL per il mese di Luglio ==

http://archives.postgresql.org/pgsql-jobs/2008-07/threads.php

== PostgreSQL news locali ==

Sponsorizzate il PGDay Europeo!
http://www.pgday.org/en/sponsors/campaign

E' iniziato il call for papers per il PGDay europeo.
http://www.pgday.org/en/call4papers

Il meeting del TorontoPUG ci sarà il 28 luglio.
http://pugs.postgresql.org/torontopug

Il pgDay a San Francisco ci sarà il 5 agosto. Schedule:
http://pugs.postgresql.org/node/447
Registratevi qui:
http://www.linuxworldexpo.com/live/12/ehall//SN460564

Il PGCon Brasile 2008 ci sara' il 26 e 27 settembre 2008 a Unicamp, Campinas.
http://pgcon.postgresql.org.br/index.en.html

Il PGDay.(IT|EU) 2008 ci sarà il 17 e 18 ottobre a Prato.
http://www.pgday.org/it/

== News su PostgreSQL ==

Planet PostgreSQL: http://www.planetpostgresql.org/

General Bits, archivi e nuovi articoli occasionali:
http://www.varlena.com/GeneralBits/

PostgreSQL Weekly News è stato spedito questa settimana grazie a David Fetter.

Per segnalare news e annunci invia un email in inglese entro le ore 15,
fuso orario della costa orientale degli U.S.A, di domenica.

Per segnalazioni in inglese david(at)fetter(dot)org, per segnalazioni in
Tedesco pwn(at)pgug(dot)de, per segnalazioni in italiano pwn(at)itpug(dot)org


== Patch applicate ==
Tom Lane committed:

- pgsql/src/include/storage/bufpage.h, clean up buildfarm failures
 arising from the seemingly straightforward page macros patch :-(.
 Results from both baiji and mastodon imply that MSVC fails to
 perceive offsetof(PageHeaderData, pd_linp[0]) as a constant
 expression in some contexts where offsetof(PageHeaderData, pd_linp)
 works fine.  Sloth, thy name is Macro.

- Support "variadic" functions, which can accept a variable number of
 arguments so long as all the trailing arguments are of the same
 (non-array) type.  The function receives them as a single array
 argument (which is why they have to all be the same type).  It might
 be useful to extend this facility to aggregates, but this patch
 doesn't do that.  This patch imposes a noticeable slowdown on
 function lookup --- a follow-on patch will fix that by adding a
 redundant column to pg_proc.  Pavel Stehule

- Add a "provariadic" column to pg_proc to eliminate the remarkably
 expensive need to deconstruct proargmodes for each pg_proc entry
 inspected by FuncnameGetCandidates().  Fixes function lookup
 performance regression caused by yesterday's variadic-functions
 patch.  In passing, make pg_proc.probin be NULL, rather than a dummy
 value '-', in cases where it is not actually used for the particular
 type of function.  This should buy back some of the space cost of
 the extra column.

- In pgsql/src/backend/commands/tablecmds.c, fix previous patch so
 that it actually works --- consider TRUNCATE foo, public.foo.

- In pgsql/src/backend/nodes/outfuncs.c, add dump support for SortBy
 nodes.  Needed this while debugging a reported problem with
 DISTINCT, so might as well commit it.

- Implement SQL-spec RETURNS TABLE syntax for functions.  (Unlike the
 original submission, this patch treats TABLE output parameters as
 being entirely equivalent to OUT parameters -- tgl) Pavel Stehule.

- In pgsql/src/bin/psql/describe.c, suppress compiler warning, and not
 incidentally make the code more robust.  The previous coding was
 quite risky because it was testing conditions different from 'is the
 array really allocated?'.

- In pgsql/src/backend/storage/ipc/sinvaladt.c, fix a race condition
 that I introduced into sinvaladt.c during the recent rewrite.  When
 called from SIInsertDataEntries, SICleanupQueue releases the write
 lock if it has to issue a kill() to signal some laggard backend.
 That still seems like a good idea --- but it's possible that by the
 time we get the lock back, there are no longer enough free message
 slots to satisfy SIInsertDataEntries' requirement.  Must recheck,
 and repeat the whole SICleanupQueue process if not.  Noted while
 reading code.

- Provide a function hook to let plug-ins get control around
 ExecutorRun.  ITAGAKI Takahiro

- Adjust things so that the query_string of a cached plan and the
 sourceText of a portal are never NULL, but reliably provide the
 source text of the query.  It turns out that there was only one
 place that was really taking a short-cut, which was the 'EXECUTE'
 utility statement.  That doesn't seem like a sufficiently critical
 performance hotspot to justify not offering a guarantee of validity
 of the portal source text.  Fix it to copy the source text over from
 the cached plan.  Add Asserts in the places that set up cached plans
 and portals to reject null source strings, and simplify a bunch of
 places that formerly needed to guard against nulls.  There may be a
 few places that cons up statements for execution without having any
 source text at all; I found one such in ConvertTriggerToFK().  It
 seems sufficient to inject a phony source string in such a case, for
 instance ProcessUtility((Node *) atstmt, "(generated ALTER TABLE ADD
 FOREIGN KEY command)", NULL, false, None_Receiver, NULL); We should
 take a second look at the usage of debug_query_string, particularly
 the recently added current_query() SQL function.  ITAGAKI Takahiro
 and Tom Lane

- Avoid substituting NAMEDATALEN, FLOAT4PASSBYVAL, and FLOAT8PASSBYVAL
 into the postgres.bki file during build, because we want that file
 to be entirely platform- and configuration-independent; else it
 can't safely be put into /usr/share on multiarch machines.  We can
 do the substitution during initdb, instead.  FLOAT4PASSBYVAL and
 FLOAT8PASSBYVAL are new breakage as of 8.4, while the NAMEDATALEN
 hazard has been there all along but I guess no one tripped over it.
 Noticed while trying to build "universal" OS X binaries.

- Add a pg_dump option --lock-wait-timeout to allow failing the dump
 if unable to acquire shared table locks within a specified amount of
 time.  David Gould.

- Code review for array_fill patch: fix inadequate check for array
 size overflow and bogus documentation (dimension arrays are int[]
 not anyarray).  Also the errhint() messages seem to be really
 errdetail(), since there is nothing heuristic about them.  Some
 other trivial cosmetic improvements.

Bruce Momjian committed:

- Mark TODO as done, per Simon Riggs: "Fix server restart problem when
 the server was shutdown during a PITR backup."

- Add URL for TODO: "Consider allowing control of upper/lower case
 folding of unquoted identifiers."

- Mark TODO as done: "Add temporal versions of generate_series()."

- In psql, rename trans_* variables to translate_* for clarity.

- In pgsql/src/bin/psql/describe.c, add column storage type to psql
 \d+ display.  Gregory Stark.

- Add to TODO: "Improve ability to modify views via ALTER TABLE."

- In pgsql/src/bin/psql/describe.c, add comment about literal strings
 in our syntax not being translated in psql.

- In pgsql/doc/src/sgml/charset.sgml, clarify that locale names on
 Windows are more verbose.  Report from Martin Saschek

- In pgsql/src/bin/psql/describe.c, have psql \d show the value of
 sequence columns.  Dickson S. Guedes.

- Mark TODO as done: "Have psql show current values for a sequence."

- Add TODO: "Consider decreasing the I/O caused by updating tuple hint
 bits."

- In pgsql/src/bin/psql/describe.c, addendum:  psql sequence value
 display patch was originally written by Euler Taveira de Oliveira.

- Add to TODO: "Reduce PITR WAL file size by removing full page writes
 and by removing trailing bytes to improve compression."

- In pgsql/doc/src/sgml/charset.sgml, add Swedish_Sweden.1252 Windows
 locale example to docs.

- In pgsql/doc/src/sgml/func.sgml, fix alignment of SGML array docs.

- Add array_fill() to create arrays initialized with a value.  Pavel
 Stehule.

- Add to TODO: "Add external tool to auto-tune some postgresql.conf
 parameters."

- In pgsql/src/backend/commands/tablecmds.c, allow TRUNCATE foo, foo
 to succeed, per report from Nikhils.

- Add URL for TODO: "Implement SQL:2003 window functions."

- Add to TODO: "Reduce locking requirements for creating a trigger."

- Add URL for TODO: "Implement SQL:2003 window functions."

- In psql, run .psqlrc _after_ printing warnings and banner.

- Properly document archive/restore command examples on Windows.
 ITAGAKI Takahiro

- In pgsql/src/bin/psql/startup.c, revert patch so .psqlrc can
 suppress startup banner.  Run .psqlrc _after_ printing warnings and
 banner.

Alvaro Herrera committed:

- In pgsql/src/backend/postmaster/autovacuum.c, avoid crashing when a
 table is deleted while we're on the process of checking it.  Per
 report from Tom Lane based on buildfarm evidence.

- Add MSVC++ debug libraries to .cvsignore.


== Patch rigettate (per ora) ==
Nessuno è stato scontentato questa settimana :-)

== Patch in attesa ==
ITAGAKI Takahiro sent in another revision of his patch executor_hook
for pg_stat_statements patch.

Xiao Meng sent in three revisions of his patch to improve the
performance of hash indexes.

David Wheeler sent in another revision of his case-insensitive text
patch.

Sushant Sinha sent in three patches to update the tsearch2
documentation and add regression testing for the case when cover size
is larger than MaxWords.

Simon Riggs sent in two revisions of a patch designed to report when
we're doing an anti-wraparound VACUUM.

Jan Urbanski sent in a WIP patch to create an oprrest function for
tsvector @@ tsquery and tsquery @@ tsvector.

Simon Riggs sent in another revision of his patch to add pg_dump
options --schema-pre-load and --schema-post-load.


-- 
(all opinions expressed are my own)
Federico Campoli
PostgreSQL Consulting -> PGHost http://www.pghost.eu

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