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<!-- doc/src/sgml/release-9.0.sgml --> |
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<!-- See header comment in release.sgml about typical markup --> |
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<sect1 id="release-9-0-4"> |
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<title>Release 9.0.4</title> |
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<note> |
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<title>Release Date</title> |
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<simpara>2011-04-18</simpara> |
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</note> |
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<para> |
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This release contains a variety of fixes from 9.0.3. |
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For information about new features in the 9.0 major release, see |
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<xref linkend="release-9-0">. |
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</para> |
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<sect2> |
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<title>Migration to Version 9.0.4</title> |
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<para> |
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A dump/restore is not required for those running 9.0.X. |
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</para> |
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<para> |
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However, if your installation was upgraded from a previous major |
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release by running <application>pg_upgrade</>, you should take |
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action to prevent possible data loss due to a now-fixed bug in |
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<application>pg_upgrade</>. The recommended solution is to run |
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<command>VACUUM FREEZE</> on all TOAST tables. |
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More information is available at <ulink |
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url="http://wiki.postgresql.org/wiki/20110408pg_upgrade_fix"> |
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http://wiki.postgresql.org/wiki/20110408pg_upgrade_fix</ulink>. |
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</para> |
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</sect2> |
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<sect2> |
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<title>Changes</title> |
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<itemizedlist> |
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<listitem> |
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<para> |
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Fix <application>pg_upgrade</>'s handling of TOAST tables |
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(Bruce Momjian) |
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</para> |
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<para> |
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The <structname>pg_class</>.<structfield>relfrozenxid</> value for |
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TOAST tables was not correctly copied into the new installation |
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during <application>pg_upgrade</>. This could later result in |
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<literal>pg_clog</> files being discarded while they were still |
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needed to validate tuples in the TOAST tables, leading to |
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<quote>could not access status of transaction</> failures. |
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</para> |
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<para> |
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This error poses a significant risk of data loss for installations |
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that have been upgraded with <application>pg_upgrade</>. This patch |
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corrects the problem for future uses of <application>pg_upgrade</>, |
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but does not in itself cure the issue in installations that have been |
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processed with a buggy version of <application>pg_upgrade</>. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Suppress incorrect <quote>PD_ALL_VISIBLE flag was incorrectly set</> |
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warning (Heikki Linnakangas) |
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</para> |
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<para> |
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<command>VACUUM</> would sometimes issue this warning in cases that |
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are actually valid. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Use better SQLSTATE error codes for hot standby conflict cases |
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(Tatsuo Ishii and Simon Riggs) |
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</para> |
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<para> |
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All retryable conflict errors now have an error code that indicates |
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that a retry is possible. Also, session closure due to the database |
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being dropped on the master is now reported as |
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<literal>ERRCODE_DATABASE_DROPPED</>, rather than |
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<literal>ERRCODE_ADMIN_SHUTDOWN</>, so that connection poolers can |
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handle the situation correctly. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Prevent intermittent hang in interactions of startup process with |
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bgwriter process (Simon Riggs) |
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</para> |
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<para> |
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This affected recovery in non-hot-standby cases. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Disallow including a composite type in itself (Tom Lane) |
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</para> |
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<para> |
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This prevents scenarios wherein the server could recurse infinitely |
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while processing the composite type. While there are some possible |
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uses for such a structure, they don't seem compelling enough to |
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justify the effort required to make sure it always works safely. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Avoid potential deadlock during catalog cache initialization |
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(Nikhil Sontakke) |
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</para> |
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<para> |
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In some cases the cache loading code would acquire share lock on a |
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system index before locking the index's catalog. This could deadlock |
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against processes trying to acquire exclusive locks in the other, |
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more standard order. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix dangling-pointer problem in <literal>BEFORE ROW UPDATE</> trigger |
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handling when there was a concurrent update to the target tuple |
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(Tom Lane) |
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</para> |
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<para> |
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This bug has been observed to result in intermittent <quote>cannot |
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extract system attribute from virtual tuple</> failures while trying to |
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do <literal>UPDATE RETURNING ctid</>. There is a very small probability |
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of more serious errors, such as generating incorrect index entries for |
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the updated tuple. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Disallow <command>DROP TABLE</> when there are pending deferred trigger |
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events for the table (Tom Lane) |
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</para> |
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<para> |
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Formerly the <command>DROP</> would go through, leading to |
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<quote>could not open relation with OID nnn</> errors when the |
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triggers were eventually fired. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Allow <quote>replication</> as a user name in |
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<filename>pg_hba.conf</> (Andrew Dunstan) |
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</para> |
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<para> |
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<quote>replication</> is special in the database name column, but it |
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was mistakenly also treated as special in the user name column. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Prevent crash triggered by constant-false WHERE conditions during |
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GEQO optimization (Tom Lane) |
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</para> |
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<para> |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Improve planner's handling of semi-join and anti-join cases |
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(Tom Lane) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix handling of <literal>SELECT FOR UPDATE</> in a sub-SELECT |
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(Tom Lane) |
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</para> |
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<para> |
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This bug typically led to <quote>cannot extract system attribute from |
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virtual tuple</> errors. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix selectivity estimation for text search to account for NULLs |
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(Jesper Krogh) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix get_actual_variable_range() to support hypothetical indexes |
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injected by an index adviser plugin (Gurjeet Singh) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix PL/Python memory leak involving array slices (Daniel Popowich) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Allow <application>libpq</>'s SSL initialization to succeed when |
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user's home directory is unavailable (Tom Lane) |
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</para> |
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<para> |
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If the SSL mode is such that a root certificate file is not required, |
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there is no need to fail. This change restores the behavior to what |
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it was in pre-9.0 releases. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix <application>libpq</> to return a useful error message for errors |
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detected in <function>conninfo_array_parse</> (Joseph Adams) |
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</para> |
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<para> |
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A typo caused the library to return NULL, rather than the |
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<structname>PGconn</> structure containing the error message, to the |
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application. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix <application>ecpg</> preprocessor's handling of float constants |
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(Heikki Linnakangas) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix parallel <application>pg_restore</> to handle comments on |
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POST_DATA items correctly (Arnd Hannemann) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix <application>pg_restore</> to cope with long lines (over 1KB) in |
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TOC files (Tom Lane) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Put in more safeguards against crashing due to division-by-zero |
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with overly enthusiastic compiler optimization (Aurelien Jarno) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Support use of dlopen() in FreeBSD and OpenBSD on MIPS (Tom Lane) |
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</para> |
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<para> |
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There was a hard-wired assumption that this system function was not |
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available on MIPS hardware on these systems. Use a compile-time test |
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instead, since more recent versions have it. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix compilation failures on HP-UX (Heikki Linnakangas) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Avoid crash when trying to write to the Windows console very early |
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in process startup (Rushabh Lathia) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Support building with MinGW 64 bit compiler for Windows |
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(Andrew Dunstan) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix version-incompatibility problem with <application>libintl</> on |
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Windows (Hiroshi Inoue) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix usage of <application>xcopy</> in Windows build scripts to |
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work correctly under Windows 7 (Andrew Dunstan) |
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</para> |
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<para> |
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This affects the build scripts only, not installation or usage. |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Fix path separator used by <application>pg_regress</> on Cygwin |
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(Andrew Dunstan) |
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</para> |
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</listitem> |
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<listitem> |
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<para> |
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Update time zone data files to <application>tzdata</> release 2011f |
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for DST law changes in Chile, Cuba, Falkland Islands, Morocco, Samoa, |
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and Turkey; also historical corrections for South Australia, Alaska, |
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and Hawaii. |
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</para> |
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</listitem> |
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</itemizedlist> |
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</sect2> |
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</sect1> |
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<sect1 id="release-9-0-3"> |
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<title>Release 9.0.3</title> |
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Tom Lane
15 years ago