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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-9-0-12">
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<title>Release 9.0.12</title>
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<title>Release Date</title>
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<simpara>2013-02-07</simpara>
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This release contains a variety of fixes from 9.0.11.
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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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<title>Migration to Version 9.0.12</title>
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A dump/restore is not required for those running 9.0.X.
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However, if you are upgrading from a version earlier than 9.0.6,
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see the release notes for 9.0.6.
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<title>Changes</title>
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Prevent execution of <function>enum_recv</> from SQL (Tom Lane)
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The function was misdeclared, allowing a simple SQL command to crash the
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server. In principle an attacker might be able to use it to examine the
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contents of server memory. Our thanks to Sumit Soni (via Secunia SVCRP)
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for reporting this issue. (CVE-2013-0255)
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Fix multiple problems in detection of when a consistent database
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state has been reached during WAL replay (Fujii Masao, Heikki
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Linnakangas, Simon Riggs, Andres Freund)
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Update minimum recovery point when truncating a relation file (Heikki
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Once data has been discarded, it's no longer safe to stop recovery at
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an earlier point in the timeline.
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Fix missing cancellations in hot standby mode (Noah Misch, Simon Riggs)
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The need to cancel conflicting hot-standby queries would sometimes be
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missed, allowing those queries to see inconsistent data.
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Fix SQL grammar to allow subscripting or field selection from a
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sub-SELECT result (Tom Lane)
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Fix performance problems with autovacuum truncation in busy workloads
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Truncation of empty pages at the end of a table requires exclusive
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lock, but autovacuum was coded to fail (and release the table lock)
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when there are conflicting lock requests. Under load, it is easily
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possible that truncation would never occur, resulting in table bloat.
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Fix by performing a partial truncation, releasing the lock, then
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attempting to re-acquire the lock and continue. This fix also greatly
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reduces the average time before autovacuum releases the lock after a
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conflicting request arrives.
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Protect against race conditions when scanning
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<structname>pg_tablespace</> (Stephen Frost, Tom Lane)
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<command>CREATE DATABASE</> and <command>DROP DATABASE</> could
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misbehave if there were concurrent updates of
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<structname>pg_tablespace</> entries.
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Prevent <command>DROP OWNED</> from trying to drop whole databases or
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tablespaces (Álvaro Herrera)
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For safety, ownership of these objects must be reassigned, not dropped.
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linkend="guc-vacuum-freeze-table-age"><varname>vacuum_freeze_table_age</></link>
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implementation (Andres Freund)
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The main consequence of this mistake is that lowering <link
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linkend="guc-vacuum-freeze-min-age"><varname>vacuum_freeze_min_age</></link>
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would cause full-table vacuuming scans to occur much more frequently
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Prevent misbehavior when a <symbol>RowExpr</> or <symbol>XmlExpr</>
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is parse-analyzed twice (Andres Freund, Tom Lane)
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This mistake could be user-visible in contexts such as
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<literal>CREATE TABLE LIKE INCLUDING INDEXES</>.
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Improve defenses against integer overflow in hashtable sizing
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calculations (Jeff Davis)
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Reject out-of-range dates in <function>to_date()</> (Hitoshi Harada)
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Ensure that non-ASCII prompt strings are translated to the correct
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code page on Windows (Alexander Law, Noah Misch)
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This bug affected <application>psql</> and some other client programs.
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Fix possible crash in <application>psql</>'s <command>\?</> command
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when not connected to a database (Meng Qingzhong)
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Fix <application>pg_upgrade</> to deal with invalid indexes safely
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Fix one-byte buffer overrun in <application>libpq</>'s
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<function>PQprintTuples</> (Xi Wang)
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This ancient function is not used anywhere by
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<productname>PostgreSQL</> itself, but it might still be used by some
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Make <application>ecpglib</> use translated messages properly
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Properly install <application>ecpg_compat</> and
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<application>pgtypes</> libraries on MSVC (Jiang Guiqing)
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Include our version of <function>isinf()</> in
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<application>libecpg</> if it's not provided by the system
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Rearrange configure's tests for supplied functions so it is not
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fooled by bogus exports from libedit/libreadline (Christoph Berg)
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Ensure Windows build number increases over time (Magnus Hagander)
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Make <application>pgxs</> build executables with the right
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<literal>.exe</> suffix when cross-compiling for Windows
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Add new timezone abbreviation <literal>FET</> (Tom Lane)
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This is now used in some eastern-European time zones.
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<sect1 id="release-9-0-11">
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<title>Release 9.0.11</title>
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<title>Release Date</title>
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<simpara>2012-12-06</simpara>
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This release contains a variety of fixes from 9.0.10.
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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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<title>Migration to Version 9.0.11</title>
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A dump/restore is not required for those running 9.0.X.
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However, if you are upgrading from a version earlier than 9.0.6,
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see the release notes for 9.0.6.
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<title>Changes</title>
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Fix multiple bugs associated with <command>CREATE INDEX
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CONCURRENTLY</> (Andres Freund, Tom Lane)
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Fix <command>CREATE INDEX CONCURRENTLY</> to use
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in-place updates when changing the state of an index's
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<structname>pg_index</> row. This prevents race conditions that could
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cause concurrent sessions to miss updating the target index, thus
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resulting in corrupt concurrently-created indexes.
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Also, fix various other operations to ensure that they ignore
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invalid indexes resulting from a failed <command>CREATE INDEX
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CONCURRENTLY</> command. The most important of these is
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<command>VACUUM</>, because an auto-vacuum could easily be launched
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on the table before corrective action can be taken to fix or remove
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Fix buffer locking during WAL replay (Tom Lane)
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The WAL replay code was insufficiently careful about locking buffers
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when replaying WAL records that affect more than one page. This could
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result in hot standby queries transiently seeing inconsistent states,
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resulting in wrong answers or unexpected failures.
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Fix an error in WAL generation logic for GIN indexes (Tom Lane)
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This could result in index corruption, if a torn-page failure occurred.
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Properly remove startup process's virtual XID lock when promoting a
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hot standby server to normal running (Simon Riggs)
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This oversight could prevent subsequent execution of certain
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operations such as <command>CREATE INDEX CONCURRENTLY</>.
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Avoid bogus <quote>out-of-sequence timeline ID</> errors in standby
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mode (Heikki Linnakangas)
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Prevent the postmaster from launching new child processes after it's
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received a shutdown signal (Tom Lane)
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This mistake could result in shutdown taking longer than it should, or
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even never completing at all without additional user action.
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Avoid corruption of internal hash tables when out of memory
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Fix planning of non-strict equivalence clauses above outer joins
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The planner could derive incorrect constraints from a clause equating
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a non-strict construct to something else, for example
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<literal>WHERE COALESCE(foo, 0) = 0</>
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when <literal>foo</> is coming from the nullable side of an outer join.
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Improve planner's ability to prove exclusion constraints from
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equivalence classes (Tom Lane)
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Fix partial-row matching in hashed subplans to handle cross-type cases
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This affects multicolumn <literal>NOT IN</> subplans, such as
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<literal>WHERE (a, b) NOT IN (SELECT x, y FROM ...)</>
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when for instance <literal>b</> and <literal>y</> are <type>int4</>
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and <type>int8</> respectively. This mistake led to wrong answers
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or crashes depending on the specific datatypes involved.
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Acquire buffer lock when re-fetching the old tuple for an
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<literal>AFTER ROW UPDATE/DELETE</> trigger (Andres Freund)
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In very unusual circumstances, this oversight could result in passing
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incorrect data to the precheck logic for a foreign-key enforcement
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trigger. That could result in a crash, or in an incorrect decision
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about whether to fire the trigger.
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Fix <command>ALTER COLUMN TYPE</> to handle inherited check
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constraints properly (Pavan Deolasee)
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This worked correctly in pre-8.4 releases, and now works correctly
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Fix <command>REASSIGN OWNED</> to handle grants on tablespaces
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(Álvaro Herrera)
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Ignore incorrect <structname>pg_attribute</> entries for system
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columns for views (Tom Lane)
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Views do not have any system columns. However, we forgot to
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remove such entries when converting a table to a view. That's fixed
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properly for 9.3 and later, but in previous branches we need to defend
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against existing mis-converted views.
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Fix rule printing to dump <literal>INSERT INTO <replaceable>table</>
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DEFAULT VALUES</literal> correctly (Tom Lane)
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Guard against stack overflow when there are too many
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<literal>UNION</>/<literal>INTERSECT</>/<literal>EXCEPT</> clauses
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in a query (Tom Lane)
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Prevent platform-dependent failures when dividing the minimum possible
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integer value by -1 (Xi Wang, Tom Lane)
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Fix possible access past end of string in date parsing
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Fix failure to advance XID epoch if XID wraparound happens during a
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checkpoint and <varname>wal_level</> is <literal>hot_standby</>
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(Tom Lane, Andres Freund)
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While this mistake had no particular impact on
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<productname>PostgreSQL</productname> itself, it was bad for
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applications that rely on <function>txid_current()</> and related
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functions: the TXID value would appear to go backwards.
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Produce an understandable error message if the length of the path name
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for a Unix-domain socket exceeds the platform-specific limit
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(Tom Lane, Andrew Dunstan)
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Formerly, this would result in something quite unhelpful, such as
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<quote>Non-recoverable failure in name resolution</>.
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Fix memory leaks when sending composite column values to the client
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Make <application>pg_ctl</> more robust about reading the
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<filename>postmaster.pid</> file (Heikki Linnakangas)
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Fix race conditions and possible file descriptor leakage.
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Fix possible crash in <application>psql</> if incorrectly-encoded data
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is presented and the <varname>client_encoding</> setting is a
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client-only encoding, such as SJIS (Jiang Guiqing)
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Fix bugs in the <filename>restore.sql</> script emitted by
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<application>pg_dump</> in <literal>tar</> output format (Tom Lane)
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The script would fail outright on tables whose names include
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upper-case characters. Also, make the script capable of restoring
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data in <option>--inserts</> mode as well as the regular COPY mode.
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Fix <application>pg_restore</> to accept POSIX-conformant
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<literal>tar</> files (Brian Weaver, Tom Lane)
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The original coding of <application>pg_dump</>'s <literal>tar</>
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output mode produced files that are not fully conformant with the
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POSIX standard. This has been corrected for version 9.3. This
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patch updates previous branches so that they will accept both the
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incorrect and the corrected formats, in hopes of avoiding
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compatibility problems when 9.3 comes out.
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Fix <application>pg_resetxlog</> to locate <filename>postmaster.pid</>
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correctly when given a relative path to the data directory (Tom Lane)
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This mistake could lead to <application>pg_resetxlog</> not noticing
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that there is an active postmaster using the data directory.
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Fix <application>libpq</>'s <function>lo_import()</> and
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<function>lo_export()</> functions to report file I/O errors properly
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Fix <application>ecpg</>'s processing of nested structure pointer
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variables (Muhammad Usama)
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Fix <application>ecpg</>'s <function>ecpg_get_data</> function to
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handle arrays properly (Michael Meskes)
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Make <filename>contrib/pageinspect</>'s btree page inspection
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functions take buffer locks while examining pages (Tom Lane)
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Fix <application>pgxs</> support for building loadable modules on AIX
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Building modules outside the original source tree didn't work on AIX.
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Update time zone data files to <application>tzdata</> release 2012j
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for DST law changes in Cuba, Israel, Jordan, Libya, Palestine, Western
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Samoa, and portions of Brazil.
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<sect1 id="release-9-0-10">
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<title>Release 9.0.10</title>
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<title>Release Date</title>
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<simpara>2012-09-24</simpara>
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This release contains a variety of fixes from 9.0.9.
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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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<title>Migration to Version 9.0.10</title>
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A dump/restore is not required for those running 9.0.X.
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However, if you are upgrading from a version earlier than 9.0.6,
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see the release notes for 9.0.6.
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<title>Changes</title>
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Fix planner's assignment of executor parameters, and fix executor's
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rescan logic for CTE plan nodes (Tom Lane)
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These errors could result in wrong answers from queries that scan the
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same <literal>WITH</> subquery multiple times.
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Improve page-splitting decisions in GiST indexes (Alexander Korotkov,
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Robert Haas, Tom Lane)
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Multi-column GiST indexes might suffer unexpected bloat due to this
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Fix cascading privilege revoke to stop if privileges are still held
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If we revoke a grant option from some role <replaceable>X</>, but
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<replaceable>X</> still holds that option via a grant from someone
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else, we should not recursively revoke the corresponding privilege
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from role(s) <replaceable>Y</> that <replaceable>X</> had granted it
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Improve error messages for Hot Standby misconfiguration errors
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Fix handling of <literal>SIGFPE</> when PL/Perl is in use (Andres Freund)
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Perl resets the process's <literal>SIGFPE</> handler to
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<literal>SIG_IGN</>, which could result in crashes later on. Restore
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the normal Postgres signal handler after initializing PL/Perl.
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Prevent PL/Perl from crashing if a recursive PL/Perl function is
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redefined while being executed (Tom Lane)
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Work around possible misoptimization in PL/Perl (Tom Lane)
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Some Linux distributions contain an incorrect version of
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<filename>pthread.h</> that results in incorrect compiled code in
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PL/Perl, leading to crashes if a PL/Perl function calls another one
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that throws an error.
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Fix <application>pg_upgrade</>'s handling of line endings on Windows
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Previously, <application>pg_upgrade</> might add or remove carriage
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returns in places such as function bodies.
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On Windows, make <application>pg_upgrade</> use backslash path
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separators in the scripts it emits (Andrew Dunstan)
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Update time zone data files to <application>tzdata</> release 2012f
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for DST law changes in Fiji
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<sect1 id="release-9-0-9">
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<title>Release 9.0.9</title>
added
removed
doc/src/sgml/release-9.0.sgml
