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>Appendix E. Release Notes</TD
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>E.62. Release 9.0.12</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2013-02-07</P
></DIV
><P
> This release contains a variety of fixes from 9.0.11.
For information about new features in the 9.0 major release, see
<A
HREF="release-9-0.html"
>Section E.74</A
>.
</P
><DIV
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><H2
CLASS="SECT2"
><A
NAME="AEN121804"
>E.62.1. Migration to Version 9.0.12</A
></H2
><P
> A dump/restore is not required for those running 9.0.X.
</P
><P
> However, if you are upgrading from a version earlier than 9.0.6,
see <A
HREF="release-9-0-6.html"
>Section E.68</A
>.
</P
></DIV
><DIV
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><H2
CLASS="SECT2"
><A
NAME="AEN121809"
>E.62.2. 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
> 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 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
> 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
> 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
> Reject out-of-range dates in <CODE
CLASS="FUNCTION"
>to_date()</CODE
> (Hitoshi Harada)
</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 <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> to deal with invalid indexes safely
(Bruce Momjian)
</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
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