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== Wöchentlicher PostgreSQL Newsletter - 10. April 2011 ==

From: Andreas 'ads' Scherbaum <adsmail(at)wars-nicht(dot)de>
To: "pgsql-de-allgemein(at)postgresql(dot)org" <pgsql-de-allgemein(at)postgresql(dot)org>
Cc: "pgusers(at)postgres(dot)de" <pgusers(at)postgres(dot)de>
Subject: == Wöchentlicher PostgreSQL Newsletter - 10. April 2011 ==
Date: 2011-04-13 08:51:45
Message-ID: 4DA56421.5030501@wars-nicht.de (view raw or flat)
Thread:
Lists: pgsql-de-allgemein

Der Originalartikel befindet sich unter:

http://www.postgresql.org/community/weeklynews/pwn20110410



== Wöchentlicher PostgreSQL Newsletter - 10. April 2011 ==

Austin PUG trifft sich am 13. April:
http://pugs.postgresql.org/austinpug

NYCPUG trifft sich am 14. April um 18 Uhr. Details und Anmeldung unter:
http://www.meetup.com/postgresql-3/events/17219508/

== PostgreSQL Produkt Neuigkeiten ==

MicroOLAP Database Designer 1.8.0 Beta für PostgreSQL ist erschienen.
http://microolap.com/products/database/postgresql-designer/

pgbouncer 1.4.1, ein leichtgewichtiger Connectionpooler für
PostgreSQL, ist erschienen.
http://pgfoundry.org/projects/pgbouncer/

PostgreSQL Multiple Precision Arithmetic 1.0b1 ist erschienen:
http://pgmp.projects.postgresql.org/

Pyrseas 0.1.0, ein Versionskontrollwerkzeug für PostgreSQL,
ist erschienen.
http://www.pyrseas.org/

== PostgreSQL Jobs im April ==

http://archives.postgresql.org/pgsql-jobs/2011-04/threads.php

== PostgreSQL Lokal ==

Es wird eine umfangreiche PostgreSQL Präsenz auf der MySQL Konferenz
und Expo am am 11-14. April 2011 in Santa Clara, Kalifornien, geben.
http://en.oreilly.com/mysql2011/public/schedule/tag/postgresql

Die Türkische PostgreSQL User Group organisiert eine eintägige
Veranstaltung am 30. April 2011. Folge @PgDayTR für Details,
auf Türkisch.
http://pgday.postgresql.org.tr/2011/

Das Open Database Camp findet vom 7. bis 9. Mai 2011 in Sardinien,
Italien statt.
http://datacharmer.blogspot.com/2011/01/announcing-open-database-camp-sardinia.html

PGCon findet am 19. und 20. Mai 2011 an der Universität
von Ottawa statt, vorher gibt es am 17. und 18. Mai
zwei Tage mit Trainings.
http://www.pgcon.org/2011/

PG Session 2 über PostGIS findet am 23. Juni in Paris statt.
Der Call for Papers ist jetzt offen.
http://www.postgresql-sessions.org/en/2/

pgbr findet in Sao Paulo, Brazilien, am 3. und 4. November 2011 statt.
http://pgbr.postgresql.org.br/

== PostgreSQL in den News ==

Planet PostgreSQL: http://planet.postgresql.org/

Dieser wöchentliche PostgreSQL Newsletter wurde erstellt von David Fetter.

Sende Neuigkeiten und Ankündigungen bis Sonntag, 15 Uhr Pazifischer
Zeit. Bitte sende englische Beiträge an david(at)fetter(dot)org, deutsche an
pwn(at)pgug(dot)de, italienische an pwn(at)itpug(dot)org, spanische an pwn(at)arpug(dot)com(dot)ar(dot)

== Reviews ==

== Angewandte Patches ==

Alvaro Herrera pushed:

- Duplicate expansion of "direction" from FETCH's synopsis into MOVE
 
http://git.postgresql.org/pg/commitdiff/8c250f3741f4f897362de32a03f56726cf3f9774

- Uppercase <!ENTITY> and <!DOCTYPE> tags in SGML source.  This
   improves compatibility with external toolchains, such as those used
   by some documentation translation tools.  Gabriele Bartolini
 
http://git.postgresql.org/pg/commitdiff/fc3459d70c5d842fe6519522649c8a47454f25bb

- Update MSVC toolchain to match SGML entity uppercasing.  Per Robert
   Haas
 
http://git.postgresql.org/pg/commitdiff/34a991619bddf2bfb441cf2d4396b67198326bcd

- Change "Id" to "id" in some SGML tags.  Gabriele Bartolini
 
http://git.postgresql.org/pg/commitdiff/38d15f16511cb9f75ed2b1e1f73117c1bc581538

Robert Haas pushed:

- Include pid in pg_lock_status() results even for SIREAD locks.  Dan
   Ports.
 
http://git.postgresql.org/pg/commitdiff/a0e50e698beb89a8ec203303581e464a5f69fc41

- Add missing check on invocation of trusted procedures.  KaiGai Kohei
 
http://git.postgresql.org/pg/commitdiff/595a441ae999fb155a381fa4bcceadf40f041a33

- Merge synchronous_replication setting into synchronous_commit.  This
   means one less thing to configure when setting up synchronous
   replication, and also avoids some ambiguity around what the behavior
   should be when the settings of these variables conflict.  Fujii
   Masao, with additional hacking by me.
 
http://git.postgresql.org/pg/commitdiff/240067b3b0ff989d2b28f4f917f7958f2ec76b05

- Add casts from int4 and int8 to numeric.  Joey Adams, per gripe from
   Ramanujam.  Review by myself and Tom Lane.
 
http://git.postgresql.org/pg/commitdiff/f5e524d92be609c709825be8995bf77f10880c3b

- Typo fixes.  Erik Rijkers
 
http://git.postgresql.org/pg/commitdiff/ad275473a5ea75f4aa010791884004f75f3c7a65

- Repair some flakiness in CheckTargetForConflictsIn.  When we release
   and reacquire SerializableXactHashLock, we must recheck whether an
   R/W conflict still needs to be flagged, because it could have
   changed under us in the meantime.  And when we release the partition
   lock, we must re-walk the list of predicate locks from the
   beginning, because our pointer could get invalidated under us.  Bug
   report #5952 by Yamamoto Takashi.  Patch by Kevin Grittner.
 
http://git.postgresql.org/pg/commitdiff/632f0faa7c975e8984ce0f1d6b631478e41a96c2

- Fix some sloppiness in new PL/python get_source_line() function.
   Jan Urbański
 
http://git.postgresql.org/pg/commitdiff/b6bc481d5540a3ad0d39db1e9881e6bd52e54213

- Partially roll back overenthusiastic SSI optimization.  When a
   regular lock is held, Steve Singer can use that in lieu of a
   predicate lock to detect rw conflicts; but if the regular lock is
   being taken by a subtransaction, we can't assume that it'll commit,
   so releasing the parent transaction's lock in that case is a no-no.
   Kevin Grittner
 
http://git.postgresql.org/pg/commitdiff/fbc0d07796bcae8b2ee4b09ed236877338c95130

- Fix bug in propagating ALTER TABLE actions to typed tables.  We need
   to propagate such actions to all typed table children of a given
   type, not just the first one.  Noah Misch
 
http://git.postgresql.org/pg/commitdiff/0bd155cbf2543cdead70b6e6390e9260035e1468

- Make psql use pg_table_size instead of pg_relation_size on 9.0+
   servers.  Per discussion, pg_table_size() is a more helpful number
   than pg_relation_size().  Bernd Helmle, reviewed by Susanne Ebrecht
   and me.
 
http://git.postgresql.org/pg/commitdiff/cba9cd419270a9b7f442877e21685ac0de5730b3

- Truncate the predicate lock SLRU to empty, instead of almost empty.
   Otherwise, the SLRU machinery can get confused and think that the
   SLRU has wrapped around.  Along the way, regardless of whether we're
   truncating all of the SLRU or just some of it, flush pages after
   truncating, rather than before.  Kevin Grittner
 
http://git.postgresql.org/pg/commitdiff/cdcdfca40199bbdb30c78d105e4db267b631289c

Simon Riggs pushed:

- Update comments and credit doc proofreaders
 
http://git.postgresql.org/pg/commitdiff/35d2a660fea51f8acae6aa0895875757fa09cb26

- Centralise release note items related to recovery and replication
 
http://git.postgresql.org/pg/commitdiff/479ee1b962ca2d479310af762c21d7c2056fdeca

- Avoid assuming there will be only 3 states for synchronous_commit.
   Also avoid hardcoding the current default state by giving it the
   name "on" and replace with a meaningful name that reflects its
   behaviour.  Coding only, no change in behaviour.
 
http://git.postgresql.org/pg/commitdiff/88f32b7ca29982f286b61a9d0dd29be4b8a01c25

Peter Eisentraut pushed:

- Update key words table for 9.1
 
http://git.postgresql.org/pg/commitdiff/bf6848bc8c82e82f857d48185554bc3e6dcf1013

- Add traceback information to PL/Python errors.  This mimics the
   traceback information the Python interpreter prints with exceptions.
   Jan Urbański
 
http://git.postgresql.org/pg/commitdiff/2bd78eb8d51cc9ee03ba0287b23ff4c266dcd9b9

- Replace the confusing exit_nicely() by an atexit/on_exit hook
 
http://git.postgresql.org/pg/commitdiff/c75163842cf93fd7b6311df2c5545bf09447b870

- Update regression test files for PL/Python traceback patch.
 
http://git.postgresql.org/pg/commitdiff/5d0e462366f4521e37744fdb42fed3c6819a3374

- Allow pg_upgrade with PGCLIENTENCODING set.  This used to work, but
   since PGCLIENTENCODING is now a connection option variable,
   pg_upgrade would prevent it.
 
http://git.postgresql.org/pg/commitdiff/1eb2231fc46bbfa85b47c19d88f72162b323aa51

- Add collation support on Windows (MSVC build).  There is not yet
   support in initdb to populate the pg_collation catalog, but if that
   is done manually, the rest should work.
 
http://git.postgresql.org/pg/commitdiff/11745364d074f3a7ee54c98fad55cfb5c5149326

Tom Lane pushed:

- Revise the API for GUC variable assign hooks.  The previous
   functions of assign hooks are now split between check hooks and
   assign hooks, where the former can fail but the latter shouldn't.
   Aside from being conceptually clearer, this approach exposes the
   "canonicalized" form of the variable value to guc.c without having
   to do an actual assignment.  And that lets us fix the problem
   recently noted by Bernd Helmle that the auto-tune patch for
   wal_buffers resulted in bogus log messages about "parameter
   "wal_buffers" cannot be changed without restarting the server".
   There may be some speed advantage too, because this design lets hook
   functions avoid re-parsing variable values when restoring a previous
   state after a rollback (they can store a pre-parsed representation
   of the value instead).  This patch also resolves a longstanding
   annoyance about custom error messages from variable assign hooks:
   they should modify, not appear separately from, guc.c's own message
   about "invalid parameter value".
 
http://git.postgresql.org/pg/commitdiff/2594cf0e8c04406ffff19b1651c5a406d376657c

- Fix collations when we call transformWhereClause from outside the
   parser.  Previous patches took care of assorted places that call
   transformExpr from outside the main parser, but I overlooked the
   fact that some places use transformWhereClause as a shortcut for
   transformExpr + coerce_to_boolean.  In particular this broke
   collation-sensitive index WHERE clauses, as per report from Thom
   Brown.  Trigger WHEN and rule WHERE clauses too.  I'm not forcing
   initdb for this fix, but any affected indexes, triggers, or rules
   will need to be dropped and recreated.
 
http://git.postgresql.org/pg/commitdiff/d8d429890d6aa0246e28faa187a55cb0c65efd6e

- Fix SortTocFromFile() to cope with lines that are too long for its
   buffer.  The original coding supposed that a dump TOC file could
   never contain lines longer than 1K.  The folly of that was exposed
   by a recent report from Per-Olov Esgard.  We only really need to see
   the first dozen or two bytes of each line, since we're just trying
   to read off the numeric ID at the start of the line; so there's no
   need for a particularly huge buffer.  What there is a need for is
   logic to not process continuation bufferloads.  Back-patch to all
   supported branches, since it's always been like this.
 
http://git.postgresql.org/pg/commitdiff/1471a147f09f737511945ac59ca3162469d1a0c0

- Fix plpgsql's issues with dropped columns in rowtypes in 8.4 branch.
   This is a back-patch of commit dcb2bda9b7042dbf43f876c94ebf35d951de10e9
   of Aug 6 2009, which fixed assorted cases in which plpgsql would
   fail to cope with composite types that contain any dropped columns.
   Per discussion, this fix has been out in 9.0 for long enough to make
   it improbable that it creates any new bugs, so this is a low-risk
   fix.  To make it even lower risk, I did not back-patch the changes
   in execQual.c, but just accepted the duplication of code between
   there and tupconvert.c.  The added files tupconvert.h and
   tupconvert.c match their current states in HEAD.
 
http://git.postgresql.org/pg/commitdiff/5d3853a7fa40b28b44b14084863fd83a188c9a9e

- Modernize dlopen interface code for FreeBSD and OpenBSD.  Remove the
   hard-wired assumption that __mips__ (and only __mips__) lacks dlopen
   in FreeBSD and OpenBSD.  This assumption is outdated at least for
   OpenBSD, as per report from an anonymous 9.1 tester.  We can
   perfectly well use HAVE_DLOPEN instead to decide which code to use.
   Some other cosmetic adjustments to make freebsd.c, netbsd.c, and
   openbsd.c exactly alike.
 
http://git.postgresql.org/pg/commitdiff/73d9a908140e709b4cb12a8d2257a11baaec974f

- Tweaks for SSI out-of-shared memory behavior.  If we call
   hash_search() with HASH_ENTER, it will bail out rather than return
   NULL, so it's redundant to check for NULL again in the caller.
   Thus, in cases where we believe it's impossible for the hash table
   to run out of slots anyway, we can simplify the code slightly.  On
   the flip side, in cases where it's theoretically possible to run out
   of space, we don't want to rely on dynahash.c to throw an error;
   instead, we pass HASH_ENTER_NULL and throw the error ourselves if a
   NULL comes back, so that we can provide a more descriptive error
   message.  Kevin Grittner
 
http://git.postgresql.org/pg/commitdiff/56c7140ca813ba4c7ecb122a1d2b1268e705d092

- Add an example of WITH (UPDATE RETURNING) INSERT to the INSERT ref
   page.  Per a discussion with Gavin Flower.  This barely scratches
   the surface of potential WITH (something RETURNING) use cases, of
   course, but it's one of the simplest compelling examples I can think
   of.
 
http://git.postgresql.org/pg/commitdiff/8ad58279fa75636b776e4c648e1ffc7079a2c7d9

- Avoid extra whitespace in the arguments of <indexterm>.  As noted by
   Thom Brown, this confuses the DocBook index processor; it fails to
   merge entries that differ only in whitespace, and sorts them
   unexpectedly as well.  Seems like a toolchain bug, but I'm not going
   to hold my breath waiting for a fix.  Note: easiest way to find
   these is to look for double spaces in HTML.index.
 
http://git.postgresql.org/pg/commitdiff/dca30da3433c40b5f92f1704c496cda052decef9

- Modify initdb to complain only when no usable system locales are
   found.  Per discussion, the original behavior seems too noisy.  But
   if things are so broken that none of the locales reported by
   "locale -a" are usable, that's probably worth warning about.
 
http://git.postgresql.org/pg/commitdiff/d4c810d570e71b021c93e3ee3ea4ab18af4a053d

- Avoid an unnecessary syscache lookup in parse_coerce.c.  All the
   other fields of the constant are being extracted from the syscache
   entry we already have, so handle collation similarly.  (There don't
   seem to be any other uses for the new function at the moment.)
 
http://git.postgresql.org/pg/commitdiff/c5ff3ff49229e8fb7da0e46b463bfc9b12219078

- Tweak collation setup for GIN index comparison functions.  Honor
   index column's collation spec if there is one, don't go to the
   expense of calling get_typcollation when we can reasonably assume
   that all GIN storage types will use default collation, and be sure
   to set a collation for the comparePartialFn too.
 
http://git.postgresql.org/pg/commitdiff/1766a5b63a950a667ed39c25256156bf366eb43c

- Fix make_greater_string to not have an undocumented collation
   assumption.  The previous coding worked only if ltproc->fn_collation
   was always either DEFAULT_COLLATION_OID or a C-compatible locale.
   While that's true at the moment, it wasn't documented (and in fact
   wasn't true when this code was committed...).  But it only takes a
   couple more lines to make its internal caching behavior
   locale-aware, so let's do that.
 
http://git.postgresql.org/pg/commitdiff/466dac8656c11317b91c1a4bfd5cfca4508cba94

- Clean up minor collation issues in indxpath.c.  Get rid of bogus
   collation test in match_special_index_operator (even for ILIKE, the
   pattern match operator's collation doesn't matter here, and even if
   it did the test was testing the wrong thing).  Fix broken looping
   logic in expand_indexqual_rowcompare.  Add collation check in
   match_clause_to_ordering_op.  Make naming and argument ordering more
   consistent; improve comments.
 
http://git.postgresql.org/pg/commitdiff/69f1d5fe1456229aeea3096c372eb24cedc7d597

- Don't show unusable collations in psql's \dO command.  "Unusable"
   collations are those not matching the current database's encoding.
   The former behavior inconsistently showed such collations some of
   the time, depending on the details of the pattern argument.
 
http://git.postgresql.org/pg/commitdiff/7c76906b7e24d9ea94a2b0e33396ebcac600437d

- Adjust collation determination rules as per discussion.  Remove
   crude hack that tried to propagate collation through a
   function-returning-record, ie, from the function's arguments to
   individual fields selected from its result record.  That is just
   plain inconsistent, because the function result is composite and
   cannot have a collation; and there's no hope of making this kind of
   action-at-a-distance work consistently.  Adjust regression test
   cases that expected this to happen.  Meanwhile, the behavior of
   casting to a domain with a declared collation stays the same as it
   was, since that seemed to be the consensus.
 
http://git.postgresql.org/pg/commitdiff/a19002d4e5da028ff7280554b281e402c609898b

- Remove collate.linux.utf8.sql's assumptions about ".utf8" in locale
   names.  Tweak the test so that it does not depend on the platform
   using ".utf8" as the extension signifying that a locale uses UTF8
   encoding.  For the most part this just requires using the
   abbreviated collation names "en_US" etc, though I had to work a bit
   harder on the collation creation tests.  This opens the door to
   using the test on platforms that spell locales differently, for
   example ".utf-8" or ".UTF-8".  Also, the test is now somewhat useful
   with server encodings other than UTF8; though depending on which
   encoding is selected, different subsets of it will fail for lack of
   character set support.
 
http://git.postgresql.org/pg/commitdiff/f89e4dfa755b9c9be9c19f7c65cff50d47b4f33a

- Fix ILIKE to honor collation when working in single-byte encodings.
   The original collation patch only fixed the multi-byte code path.
   This change also ensures that ILIKE's idea of the case-folding rules
   is exactly the same as str_tolower's.
 
http://git.postgresql.org/pg/commitdiff/00f11f419caa873b44d70071d4ade0b8c75e7f36

- Clean up overly complex code for issuing some related error
   messages.  The original version was unreadable, and not mechanically
   checkable either.
 
http://git.postgresql.org/pg/commitdiff/9a8b73147c07e02e10e0d0a34aa99d72e3336fb2

- Teach regular expression operators to honor collations.  This
   involves getting the character classification and case-folding
   functions in the regex library to use the collations infrastructure.
   Most of this work had been done already in connection with the
   upper/lower and LIKE logic, so it was a simple matter of
   transposition.  While at it, split out these functions into a
   separate source file regc_pg_locale.c, so that they can be correctly
   labeled with the Postgres project's license rather than the
   Scriptics license.  These functions are 100% Postgres-written code
   whereas what remains in regc_locale.c is still mostly not ours, so
   lumping them both under the same copyright notice was getting more
   and more misleading.
 
http://git.postgresql.org/pg/commitdiff/1e16a8107db9a50435b39e09c6f9c52c45e63e1a

- Insert dummy "break"s to silence compiler complaints.  Apparently
   some compilers dislike a case label with nothing after it.  Per
   buildfarm.
 
http://git.postgresql.org/pg/commitdiff/7aa3f1d08292d43b983075e190eee964c389e347

- Add some more mapping macros for Microsoft wide-character API.  Per
   buildfarm.
 
http://git.postgresql.org/pg/commitdiff/f510fc1d904d3266fd433b49664a7685f4fc89ef

Bruce Momjian pushed:

- Simplify structure of query used to gather database object
   information in pg_upgrade.
 
http://git.postgresql.org/pg/commitdiff/e69d32158c18069840130f62c5597ca1ef656175

- Preserve pg_largeobject_metadata.relfrozenxid in pg_upgrade.  This
   is needed only in 9.1 because only 9.0 had this and no one is
   upgrading from a 9.0 beta to 9.0 anymore.  We basically don't
   backpatch 9.0 beta fixes at this point.
 
http://git.postgresql.org/pg/commitdiff/82a4f370735130418738f8cf0fb9155b1cff5e2b

- Have pg_upgrade properly preserve relfrozenxid in toast tables.
   This fixes a pg_upgrade bug that could lead to query errors when
   clog files are improperly removed.
 
http://git.postgresql.org/pg/commitdiff/9c38bce29cb6d3ef49b932086d31f635981b07e9

- pgindent run before PG 9.1 beta 1.
 
http://git.postgresql.org/pg/commitdiff/bf50caf105a901c4f83ac1df3cdaf910c26694a4

Andrew Dunstan pushed:

- Avoid use of mixed slash style paths in arguments to xcopy in MSVC
   builds.  Some versions of xcopy, notably on Windows 7 don't like it.
   Backpatch to 8.3, where we first used xcopy.
 
http://git.postgresql.org/pg/commitdiff/a53112338c2f5b74383ce075fbec098cd06a3ad7

- Latest consolidated typedef list from buildfarm.
 
http://git.postgresql.org/pg/commitdiff/fe1438da8aa8a45f2cee816eb54841f97d3b2f22

- Backport changes to allow building with MinGW 64 bit compiler.
   These changes have been in HEAD for some time with no ill effect.
   They are only being backported to 9.0, as the required WINNT version
   was not high enough before that.
 
http://git.postgresql.org/pg/commitdiff/2ea865de5660f75f44f6b1ba78090e41e070cb4c

- Don't make "replication" magical as a user name, only as a database
   name, in pg_hba.conf.  Per gripe from Josh Berkus.
 
http://git.postgresql.org/pg/commitdiff/ed557a373c406bbb2a1843544ebbd856ca4cac47

- Adjust regression tests on cube and ECPG for MinGW 64 bit compiler.
   Backport to 9.0, we're not supporting this compiler on earlier
   releases.
 
http://git.postgresql.org/pg/commitdiff/210f95f1cd59c6fdfe0f84b922c19d8498ac377d

- Remove CRLF line endings in new cube results file.
 
http://git.postgresql.org/pg/commitdiff/c1d82a936f6783f4b084810ff22ca01706f8054e

== Abgelehnte Patches (bis jetzt) ==

No one was disappointed this week :-)

== Eingesandte Patches ==

Alexey Klyukin sent in an update of Selena Deckelmann's patch to
create a validator for config files.

Tom Lane sent in a patch to document the revised API for GUC assign
hooks via changes to src/backend/utils/misc/README.

Shigeru HANADA sent in patches to implement comments on USER MAPPINGs,
part of SQL/MED.

Peter Eisentraut sent in a patch to fix an issue in the Windows build.

Heikki Linnakangas sent in a patch to have the parser emit an InExpr
node type (similar to the extant CaseExpr), which allows the optimizer
to rearrange IN() to OR() in cases where it is safe to do so.

Shigeru HANADA sent in a patch to implement comments on FOREIGN DATA
WRAPPER and SERVER objects, which are part of SQL/MED.

Josh Kupershmidt sent in a doc patch suggesting using openjade 1.3
rather than 1.4devel as part of the doc build toolset.

KaiGai Kohei sent in a patch for the SE-PostgreSQL supplied module
which checks the process:transition permission between the labels
involved when a client's label changes.

Noah Misch sent in another patch to fix an incompatibility between
pg_dump --binary-upgrade and ALTER TYPE ... DROP ATTRIBUTE.

Noah Misch sent in a patch to fix an issue where
pg_attribute.attinhcount was incorrect.

Peter Eisentraut sent in a patch to add automatic pg_upgrade tests.

Peter Eisentraut sent in a patch to help fix some issues with
collation support on Windows.

Muhammad Usama sent in a patch to remove an extra linefeed from
vacuumlo.

Agent M sent in a patch to use POSIX shared memory, this one
accounting for multiple-postmaster start race conditions.

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




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