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>Appendix E. Release Notes</TD
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><A
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>E.16. Release 9.2.8</A
></H1
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Release Date: </B
>2014-03-20</P
></BLOCKQUOTE
></DIV
><P
> This release contains a variety of fixes from 9.2.7.
For information about new features in the 9.2 major release, see
<A
HREF="release-9-2.html"
>Section E.24</A
>.
</P
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><H2
CLASS="SECT2"
><A
NAME="AEN117917"
>E.16.1. Migration to Version 9.2.8</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 9.2.6,
see <A
HREF="release-9-2-6.html"
>Section E.18</A
>.
</P
></DIV
><DIV
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><H2
CLASS="SECT2"
><A
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>E.16.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Restore GIN metapages unconditionally to avoid torn-page risk
(Heikki Linnakangas)
</P
><P
> Although this oversight could theoretically result in a corrupted
index, it is unlikely to have caused any problems in practice, since
the active part of a GIN metapage is smaller than a standard 512-byte
disk sector.
</P
></LI
><LI
><P
> Avoid race condition in checking transaction commit status during
receipt of a <TT
CLASS="COMMAND"
>NOTIFY</TT
> message (Marko Tiikkaja)
</P
><P
> This prevents a scenario wherein a sufficiently fast client might
respond to a notification before database updates made by the
notifier have become visible to the recipient.
</P
></LI
><LI
><P
> Allow regular-expression operators to be terminated early by query
cancel requests (Tom Lane)
</P
><P
> This prevents scenarios wherein a pathological regular expression
could lock up a server process uninterruptably for a long time.
</P
></LI
><LI
><P
> Remove incorrect code that tried to allow <TT
CLASS="LITERAL"
>OVERLAPS</TT
> with
single-element row arguments (Joshua Yanovski)
</P
><P
> This code never worked correctly, and since the case is neither
specified by the SQL standard nor documented, it seemed better to
remove it than fix it.
</P
></LI
><LI
><P
> Avoid getting more than <TT
CLASS="LITERAL"
>AccessShareLock</TT
> when de-parsing a
rule or view (Dean Rasheed)
</P
><P
> This oversight resulted in <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> unexpectedly
acquiring <TT
CLASS="LITERAL"
>RowExclusiveLock</TT
> locks on tables mentioned as
the targets of <TT
CLASS="LITERAL"
>INSERT</TT
>/<TT
CLASS="LITERAL"
>UPDATE</TT
>/<TT
CLASS="LITERAL"
>DELETE</TT
>
commands in rules. While usually harmless, that could interfere with
concurrent transactions that tried to acquire, for example,
<TT
CLASS="LITERAL"
>ShareLock</TT
> on those tables.
</P
></LI
><LI
><P
> Improve performance of index endpoint probes during planning (Tom Lane)
</P
><P
> This change fixes a significant performance problem that occurred
when there were many not-yet-committed rows at the end of the index,
which is a common situation for indexes on sequentially-assigned
values such as timestamps or sequence-generated identifiers.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>walsender</SPAN
>'s failure to shut down cleanly when client
is <SPAN
CLASS="APPLICATION"
>pg_receivexlog</SPAN
> (Fujii Masao)
</P
></LI
><LI
><P
> Check WAL level and hot standby parameters correctly when doing crash
recovery that will be followed by archive recovery (Heikki Linnakangas)
</P
></LI
><LI
><P
> Fix test to see if hot standby connections can be allowed immediately
after a crash (Heikki Linnakangas)
</P
></LI
><LI
><P
> Prevent interrupts while reporting non-<TT
CLASS="LITERAL"
>ERROR</TT
> messages
(Tom Lane)
</P
><P
> This guards against rare server-process freezeups due to recursive
entry to <CODE
CLASS="FUNCTION"
>syslog()</CODE
>, and perhaps other related problems.
</P
></LI
><LI
><P
> Fix memory leak in PL/Perl when returning a composite result, including
multiple-OUT-parameter cases (Alex Hunsaker)
</P
></LI
><LI
><P
> Fix tracking of <SPAN
CLASS="APPLICATION"
>psql</SPAN
> script line numbers
during <TT
CLASS="LITERAL"
>\copy</TT
> from out-of-line data
(Kumar Rajeev Rastogi, Amit Khandekar)
</P
><P
> <TT
CLASS="LITERAL"
>\copy ... from</TT
> incremented the script file line number
for each data line, even if the data was not coming from the script
file. This mistake resulted in wrong line numbers being reported for
any errors occurring later in the same script file.
</P
></LI
><LI
><P
> Prevent intermittent <SPAN
CLASS="QUOTE"
>"could not reserve shared memory region"</SPAN
>
failures on recent Windows versions (MauMau)
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2014a
for DST law changes in Fiji and Turkey, plus historical changes in
Israel and Ukraine.
</P
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