== WöchentlicherPostgreSQL Newsletter - 14.September 2008

Der Originalartikel befindet sich unter:
http://people.planetpostgresql.org/dfetter/index.php?/archiv es/191-PostgreS=
QL-Weekly-News-September-14-2008.html


== Wöchentlicher PostgreSQL Newsletter - 14. September 2008 ==

Commitfest Update: durch ein halbes Dutzend neuer Helfer zum Reviewen
konnten fast alle Patches zugewiesen werden. Dieses Commitfest könnte
in einer Woche abgeschlossen sein. Patches die diese Woche committed
wurden: to_date Formatprüfungen, GUC Parameter für Sourcecode Zei=
len,
Boyer-Moore Stringsuche, Funktionen zum Auslesen des Funktionstextes,
Code coverage für Regressiontests, neue Zugriffsrechte für Trunca=
te und
Verbesserungen in pg_bench, pg_dumpall, psql, PITR und Plan
Invalidierung. Diverse Patches wurden zurückgegeben weil mehr Arbeit
notwendig ist, dazu gehören Windowing Funktionen, PL/Proxy (wird es
leider nicht in 8.4 schaffen) und GRANT für Sequenzen.

Francisco J. Morosini von der Peruanischen PostgreSQL Gruppe hat
Postcast Nr. 3 erstellt mit David Fetter, PostgreSQL, DBI-Link, PL/Perl,
Erfashrungen mit PostgreSQL und Diskussionen in der Community und wie
man neue Leute Willkommen heißt.
http://www.postgresql.org.pe/?q=3Dnode/24

PgUS akzeptiert nun Mitglieder und Nominierungen für das Board.
https://www.postgresql.us/node/43

Der Kalender der Russischen PostgreSQL Community ist hier zu finden:
http://www.google.com/calendar/embed?src=3D4af2not88un2arkgn hhho2h7lk@group=
..calendar.google.com&ctz=3DEurope/Moscow

== PostgreSQL Produkt Neuigkeiten ==

Slony-I 1.2.15 erschienen.

== PostgreSQL Jobs im September ==

http://archives.postgresql.org/pgsql-jobs/2008-09/threads.ph p

== PostgreSQL Lokal ==

Die Russische PostgreSQL Community trifft sich am 16. September in
Moskau.
http://postgresmen.ru/news/view/113

Selena Deckelmann und Gabrielle Roth werden eine Präsentation über
Dateisystem Performance für PostgreSQL auf der Linux Plumbers Konferenz
geben.
http://linuxplumbersconf.org/program/speakers/getspeaker.php ?speaker=3Dmwon=
g.txt

PDXPUG trifft sich am 18. September. Tom Raney wird über sein
Visual Planner Tool sprechen.
http://pugs.postgresql.org/node/468

Die Prato Linux User Group wird PostgreSQL Vorträge im September
halten. Der Zeitplan:
http://www.prato.linux.it/serate_a_tema_2008

PGCon Brazil 2008 wird vom 26.-27. September auf dem Unicamp in
Campinas stattfinden.
http://pgcon.postgresql.org.br/index.en.html
Registrierung:
http://pgcon.postgresql.org.br/inscricoes.en.html

PgDay.fr wird am 4. Oktober in Toulouse. Der Call for Papers ist
eröffnet:
http://www.postgresqlfr.org/?q=3Dnode/1686
Registrierung:
http://www.pgday.fr/doku.php/inscription

Die Highload++ Konferenz wird vom 6.-8- Oktober in Moskau, Russland
statfinden. Gavin Roy, Asko Oja und Maxim Boguk sprechen über
PostgreSQL Dinge.
http://highload.ru

Die PostgreSQL West Konferenz 2008 wird vom 12. bis 12. Oktober in
Portland, State University in Portland, Oregon stattfinden.
http://www.postgresqlconference.org/
Die PostgreSQL West Konferenz vom 10.-12. Oktober 2008 akzeptiert
jetzt Registrierungen.
http://www.postgresqlconference.org/west08/register

PGDay.(IT|EU) 2008 wird am 17. und 18. Oktober in Prato stattfinden.
Die Registrierung ist bald möglich.
http://www.pgday.org/en/

PostgreSQL hat einen Stand auf der LinuxLive, Olymbia, in Londok (GB)
vom 23-25. Oktober 2008. Schreibe Dave Page wenn du teilnehmen möchtes=
t.
dpage AT pgamin DOT org

== PostgreSQL in den News ==

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

Dieser wöchentliche PostgreSQL Newsletter wurde erstellt von David
Fetter Josh Berkus, Michael Brewer, Joshua Drake, Devrim GUNDUZ,
Francisco J. Morosini und Nikolay Samokhvalov.

Sende Neuigkeiten und Ankündigungen bis Sonntag, 15 Uhr Pazifischer
Zeit. Bitte sende englische Beiträge an david@fetter.org, deutsche an
pwn@pgug.de, italienische an pwn@itpug.org.

== Angewandte Patches ==

Tom Lane committed:

- Make pg_dump --data-only try to order the table dumps so that
foreign keys' referenced tables are dumped before the referencing
tables. This avoids failures when the data is loaded with the FK
constraints already active. If no such ordering is possible because
of circular or self-referential constraints, print a NOTICE to warn
the user about it.

- Fix a couple of problems pointed out by Fujii Masao in the
2008-Apr-05 patch for pg_stop_backup. First, it is possible that
the history file name is not alphabetically later than the last WAL
file name, so we should explicitly check that both have been
archived. Second, the previous coding would wait forever if a
checkpoint had managed to remove the WAL file before we look for it.
Simon Riggs, plus some code cleanup by me.

- Improve the plan cache invalidation mechanism to make it invalidate
plans when user-defined functions used in a plan are modified. Also
invalidate plans when schemas, operators, or operator classes are
modified; but for these cases we just invalidate everything rather
than tracking exact dependencies, since these types of objects
seldom change in a production database. Tom Lane; loosely based on
a patch by Martin Pihlak.

- In pgsql/src/pl/plpgsql/src/gram.y, fix a couple of places where the
plpgsql grammar would produce an unhelpful 'syntax error' message,
rather than something that might draw one's attention to a missing
or wrong-type variable declaration. Per recent gripe.

- In pgsql/src/interfaces/libpq/fe-exec.c, avoid using sprintf() for a
simple octal conversion in PQescapeByteaInternal. Improves
performance, per suggestion from Rudolf Leitgeb (bug #4414). The
backend did this right already, but not libpq.

- Make our parsing of INTERVAL literals spec-compliant (or at least a
heck of a lot closer than it was before). To do this, tweak
coerce_type() to pass through the typmod information when invoking
interval_in() on an UNKNOWN constant; then fix DecodeInterval to pay
attention to the typmod when deciding how to interpret a units-less
integer value. I changed one or two other details as well. I
believe the code now reacts as expected by spec for all the literal
syntaxes that are specifically enumerated in the spec. There are
corner cases involving strings that don't exactly match the set of
fields called out by the typmod, for which we might want to tweak
the behavior some more; but I think this is an area of user
friendliness rather than spec compliance. There remain some
non-compliant details about the SQL syntax (as opposed to what's
inside the literal string); but at least we'll throw error rather
than silently doing the wrong thing in those cases.

- In pgsql/src/backend/utils/misc/guc.c, tweak newly added
set_config_sourcefile() so that the target record isn't left corrupt
if guc_strdup should fail.

- Adjust the parser to accept the typename syntax INTERVAL ...
SECOND(n) and the literal syntax INTERVAL 'string' ... SECOND(n), as
required by the SQL standard. Our old syntax put (n) directly after
INTERVAL, which was a mistake, but will still be accepted for
backward compatibility as well as symmetry with the TIMESTAMP cases.
Change intervaltypmodout to show it in the spec's way, too. (This
could potentially affect clients, if there are any that analyze the
typmod of an INTERVAL in any detail.) Also fix interval input to
handle 'min:sec.frac' properly; I had overlooked this case in my
previous patch. Document the use of the interval fields qualifier,
which up to now we had never mentioned in the docs. (I think the
omission was intentional because it didn't work per spec; but it
does now, or at least close enough to be credible.)

- Tighten up to_date/to_timestamp so that they are more likely to
reject erroneous input, rather than silently producing bizarre
results as formerly happened. Brendan Jurd

- Add a duration option to pgbench, so that test length can be
specified in seconds instead of by number of transactions to run.
Takahiro Itagaki

- In pgsql/src/backend/optimizer/path/indxpath.c, skip opfamily check
in eclass_matches_any_index() when the index isn't a btree. We
can't easily tell whether clauses generated from the equivalence
class could be used with such an index, so just assume that they
might be. This bit of over-optimization prevented use of non-btree
indexes for nestloop inner indexscans, in any case where the join
uses an equality operator that is also a btree operator --- which in
particular is typically true for hash indexes. Noted while trying
to test the current hash index patch.

- In pgsql/doc/src/sgml/citext.sgml, update citext's documentation to
match the recently-applied patch, per David Wheeler.

Alvaro Herrera committed:

- In pgsql/src/pl/plpgsql/src/pl_exec.c, improve plpgsql's ability to
report tuple incompatibility problems. Volkan YAZICI.

- Add "source file" and "source line" information to each GUC
variable. initdb forced due to changes in the pg_settings view.
Magnus Hagander and Alvaro Herrera.

- Initialize the minimum frozen Xid in vac_update_datfrozenxid using
GetOldestXmin() instead of RecentGlobalXmin; this is safer because
we do not depend on the latter being correctly set elsewhere, and
while it is more expensive, this code path is not
performance-critical. This is a real risk for autovacuum, because
it can execute whole cycles without doing a single vacuum, which
would mean that RecentGlobalXmin would stay at its initialization
value, FirstNormalTransactionId, causing a bogus value to be
inserted in pg_database. This bug could explain some recent reports
of failure to truncate pg_clog. At the same time, change the
initialization of RecentGlobalXmin to InvalidTransactionId, and
ensure that it's set to something else whenever it's going to be
used. Using it as FirstNormalTransactionId in HOT page pruning
could incur in data loss. InitPostgres takes care of setting it to
a valid value, but the extra checks are there to prevent "special"
backends from behaving in unusual ways. Per Tom Lane's detailed
problem dissection in 29544.1221061979@sss.pgh.pa.us

Peter Eisentraut committed:

- In pgsql/doc/src/sgml/docguide.sgml, update man page build
instructions.

== Abgelehnte Patches (bis jetzt) ==

No one was disappointed this week :-)

== Eingesandte Patches ==

Brendan Jurd sent in another revision of his patch to add validation
to to_date().

Alvaro Herrera sent in a patch to make GUC source file and line number
visible.

Tatsuo Ishii sent in another revision of the Common Table Expressions
patch.

Tom Lane sent in a patch to make SQL interval literal syntax conform
to SQL:2008

Heikki Linnakangas sent in another revision of his FSM patch.

Ramon Lawrence sent in two revisions of a patch to disable the
physical-tlist optimization for hash join if the number of batches is
greater than 1.

Simon Riggs sent in another revision of his recovery infrastructure
patch.

David Wheeler sent in two revisions of a patch which adds support for
char to case-insensitive text.

Heikki Linnakangas sent in a set of performance tests for his FSM
patch.

KaiGai Kohei sent in another set of patches for SE-PostgreSQL.

Asif Naeem sent in a patch which correctly copies plugins to the
lib/plugins directory.

--=20
Andreas 'ads' Scherbaum
Deutsche PostgreSQL User Group: http://www.pgug.de
DPWN: http://andreas.scherbaum.la/blog/categories/18-PWN

--=20
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