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>Appendix E. Release Notes</TD
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><A
NAME="RELEASE-9-2-3"
>E.22. Release 9.2.3</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2013-02-07</P
></DIV
><P
> This release contains a variety of fixes from 9.2.2.
For information about new features in the 9.2 major release, see
<A
HREF="release-9-2.html"
>Section E.25</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN113842"
>E.22.1. Migration to Version 9.2.3</A
></H2
><P
> A dump/restore is not required for those running 9.2.X.
</P
><P
> However, if you are upgrading from a version earlier than 9.2.2,
see <A
HREF="release-9-2-2.html"
>Section E.23</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN113847"
>E.22.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Prevent execution of <CODE
CLASS="FUNCTION"
>enum_recv</CODE
> from SQL (Tom Lane)
</P
><P
> The function was misdeclared, allowing a simple SQL command to crash the
server. In principle an attacker might be able to use it to examine the
contents of server memory. Our thanks to Sumit Soni (via Secunia SVCRP)
for reporting this issue. (CVE-2013-0255)
</P
></LI
><LI
><P
> Fix multiple problems in detection of when a consistent database
state has been reached during WAL replay (Fujii Masao, Heikki
Linnakangas, Simon Riggs, Andres Freund)
</P
></LI
><LI
><P
> Fix detection of end-of-backup point when no actual redo work is
required (Heikki Linnakangas)
</P
><P
> This mistake could result in incorrect <SPAN
CLASS="QUOTE"
>"WAL ends before end of
online backup"</SPAN
> errors.
</P
></LI
><LI
><P
> Update minimum recovery point when truncating a relation file (Heikki
Linnakangas)
</P
><P
> Once data has been discarded, it's no longer safe to stop recovery at
an earlier point in the timeline.
</P
></LI
><LI
><P
> Fix recycling of WAL segments after changing recovery target timeline
(Heikki Linnakangas)
</P
></LI
><LI
><P
> Properly restore timeline history files from archive on cascading
standby servers (Heikki Linnakangas)
</P
></LI
><LI
><P
> Fix lock conflict detection on hot-standby servers (Andres Freund,
Robert Haas)
</P
></LI
><LI
><P
> Fix missing cancellations in hot standby mode (Noah Misch, Simon Riggs)
</P
><P
> The need to cancel conflicting hot-standby queries would sometimes be
missed, allowing those queries to see inconsistent data.
</P
></LI
><LI
><P
> Prevent recovery pause feature from pausing before users can connect
(Tom Lane)
</P
></LI
><LI
><P
> Fix SQL grammar to allow subscripting or field selection from a
sub-SELECT result (Tom Lane)
</P
></LI
><LI
><P
> Fix performance problems with autovacuum truncation in busy workloads
(Jan Wieck)
</P
><P
> Truncation of empty pages at the end of a table requires exclusive
lock, but autovacuum was coded to fail (and release the table lock)
when there are conflicting lock requests. Under load, it is easily
possible that truncation would never occur, resulting in table bloat.
Fix by performing a partial truncation, releasing the lock, then
attempting to re-acquire the lock and continue. This fix also greatly
reduces the average time before autovacuum releases the lock after a
conflicting request arrives.
</P
></LI
><LI
><P
> Improve performance of <CODE
CLASS="FUNCTION"
>SPI_execute</CODE
> and related
functions, thereby improving PL/pgSQL's <TT
CLASS="LITERAL"
>EXECUTE</TT
>
(Heikki Linnakangas, Tom Lane)
</P
><P
> Remove some data-copying overhead that was added in 9.2 as a
consequence of revisions in the plan caching mechanism. This
eliminates a performance regression compared to 9.1, and also saves
memory, especially when the query string to be executed contains many
SQL statements.
</P
><P
> A side benefit is that multi-statement query strings are now
processed fully serially, that is we complete execution of earlier
statements before running parse analysis and planning on the
following ones. This eliminates a long-standing issue, in that DDL
that should affect the behavior of a later statement will now behave as
expected.
</P
></LI
><LI
><P
> Restore pre-9.2 cost estimates for index usage (Tom Lane)
</P
><P
> An ill-considered change of a fudge factor led to undesirably high
cost estimates for use of very large indexes.
</P
></LI
><LI
><P
> Fix intermittent crash in <TT
CLASS="LITERAL"
>DROP INDEX CONCURRENTLY</TT
> (Tom Lane)
</P
></LI
><LI
><P
> Fix potential corruption of shared-memory lock table during
<TT
CLASS="COMMAND"
>CREATE/DROP INDEX CONCURRENTLY</TT
> (Tom Lane)
</P
></LI
><LI
><P
> Fix <TT
CLASS="COMMAND"
>COPY</TT
>'s multiple-tuple-insertion code for the case of
a tuple larger than page size minus fillfactor (Heikki Linnakangas)
</P
><P
> The previous coding could get into an infinite loop.
</P
></LI
><LI
><P
> Protect against race conditions when scanning
<TT
CLASS="STRUCTNAME"
>pg_tablespace</TT
> (Stephen Frost, Tom Lane)
</P
><P
> <TT
CLASS="COMMAND"
>CREATE DATABASE</TT
> and <TT
CLASS="COMMAND"
>DROP DATABASE</TT
> could
misbehave if there were concurrent updates of
<TT
CLASS="STRUCTNAME"
>pg_tablespace</TT
> entries.
</P
></LI
><LI
><P
> Prevent <TT
CLASS="COMMAND"
>DROP OWNED</TT
> from trying to drop whole databases or
tablespaces (Álvaro Herrera)
</P
><P
> For safety, ownership of these objects must be reassigned, not dropped.
</P
></LI
><LI
><P
> Fix error in <A
HREF="runtime-config-client.html#GUC-VACUUM-FREEZE-TABLE-AGE"
><TT
CLASS="VARNAME"
>vacuum_freeze_table_age</TT
></A
>
implementation (Andres Freund)
</P
><P
> In installations that have existed for more than <A
HREF="runtime-config-client.html#GUC-VACUUM-FREEZE-MIN-AGE"
><TT
CLASS="VARNAME"
>vacuum_freeze_min_age</TT
></A
>
transactions, this mistake prevented autovacuum from using partial-table
scans, so that a full-table scan would always happen instead.
</P
></LI
><LI
><P
> Prevent misbehavior when a <TT
CLASS="SYMBOL"
>RowExpr</TT
> or <TT
CLASS="SYMBOL"
>XmlExpr</TT
>
is parse-analyzed twice (Andres Freund, Tom Lane)
</P
><P
> This mistake could be user-visible in contexts such as
<TT
CLASS="LITERAL"
>CREATE TABLE LIKE INCLUDING INDEXES</TT
>.
</P
></LI
><LI
><P
> Improve defenses against integer overflow in hashtable sizing
calculations (Jeff Davis)
</P
></LI
><LI
><P
> Fix some bugs associated with privileges on datatypes (Tom Lane)
</P
><P
> There were some issues with default privileges for types, and
<SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> failed to dump such privileges at all.
</P
></LI
><LI
><P
> Fix failure to ignore leftover temporary tables after a server crash
(Tom Lane)
</P
></LI
><LI
><P
> Fix failure to rotate postmaster log files for size reasons on
Windows (Jeff Janes, Heikki Linnakangas)
</P
></LI
><LI
><P
> Reject out-of-range dates in <CODE
CLASS="FUNCTION"
>to_date()</CODE
> (Hitoshi Harada)
</P
></LI
><LI
><P
> Fix <CODE
CLASS="FUNCTION"
>pg_extension_config_dump()</CODE
> to handle
extension-update cases properly (Tom Lane)
</P
><P
> This function will now replace any existing entry for the target
table, making it usable in extension update scripts.
</P
></LI
><LI
><P
> Fix PL/pgSQL's reporting of plan-time errors in possibly-simple
expressions (Tom Lane)
</P
><P
> The previous coding resulted in sometimes omitting the first line in
the <TT
CLASS="LITERAL"
>CONTEXT</TT
> traceback for the error.
</P
></LI
><LI
><P
> Fix PL/Python's handling of functions used as triggers on multiple
tables (Andres Freund)
</P
></LI
><LI
><P
> Ensure that non-ASCII prompt strings are translated to the correct
code page on Windows (Alexander Law, Noah Misch)
</P
><P
> This bug affected <SPAN
CLASS="APPLICATION"
>psql</SPAN
> and some other client programs.
</P
></LI
><LI
><P
> Fix possible crash in <SPAN
CLASS="APPLICATION"
>psql</SPAN
>'s <TT
CLASS="COMMAND"
>\?</TT
> command
when not connected to a database (Meng Qingzhong)
</P
></LI
><LI
><P
> Fix possible error if a relation file is removed while
<SPAN
CLASS="APPLICATION"
>pg_basebackup</SPAN
> is running (Heikki Linnakangas)
</P
></LI
><LI
><P
> Tolerate timeline switches while <TT
CLASS="LITERAL"
>pg_basebackup -X fetch</TT
>
is backing up a standby server (Heikki Linnakangas)
</P
></LI
><LI
><P
> Make <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> exclude data of unlogged tables when
running on a hot-standby server (Magnus Hagander)
</P
><P
> This would fail anyway because the data is not available on the standby
server, so it seems most convenient to assume
<TT
CLASS="OPTION"
>--no-unlogged-table-data</TT
> automatically.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> to deal with invalid indexes safely
(Bruce Momjian)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>'s -O/-o options (Marti Raudsepp)
</P
></LI
><LI
><P
> Fix one-byte buffer overrun in <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>'s
<CODE
CLASS="FUNCTION"
>PQprintTuples</CODE
> (Xi Wang)
</P
><P
> This ancient function is not used anywhere by
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> itself, but it might still be used by some
client code.
</P
></LI
><LI
><P
> Make <SPAN
CLASS="APPLICATION"
>ecpglib</SPAN
> use translated messages properly
(Chen Huajun)
</P
></LI
><LI
><P
> Properly install <SPAN
CLASS="APPLICATION"
>ecpg_compat</SPAN
> and
<SPAN
CLASS="APPLICATION"
>pgtypes</SPAN
> libraries on MSVC (Jiang Guiqing)
</P
></LI
><LI
><P
> Include our version of <CODE
CLASS="FUNCTION"
>isinf()</CODE
> in
<SPAN
CLASS="APPLICATION"
>libecpg</SPAN
> if it's not provided by the system
(Jiang Guiqing)
</P
></LI
><LI
><P
> Rearrange configure's tests for supplied functions so it is not
fooled by bogus exports from libedit/libreadline (Christoph Berg)
</P
></LI
><LI
><P
> Ensure Windows build number increases over time (Magnus Hagander)
</P
></LI
><LI
><P
> Make <SPAN
CLASS="APPLICATION"
>pgxs</SPAN
> build executables with the right
<TT
CLASS="LITERAL"
>.exe</TT
> suffix when cross-compiling for Windows
(Zoltan Boszormenyi)
</P
></LI
><LI
><P
> Add new timezone abbreviation <TT
CLASS="LITERAL"
>FET</TT
> (Tom Lane)
</P
><P
> This is now used in some eastern-European time zones.
</P
></LI
></UL
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