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>Appendix E. Release Notes</TD
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><A
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>E.49. Release 9.0.17</A
></H1
><DIV
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><BLOCKQUOTE
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><P
><B
>Release Date: </B
>2014-03-20</P
></BLOCKQUOTE
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><P
> This release contains a variety of fixes from 9.0.16.
For information about new features in the 9.0 major release, see
<A
HREF="release-9-0.html"
>Section E.66</A
>.
</P
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><A
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>E.49.1. Migration to Version 9.0.17</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 9.0.15,
see <A
HREF="release-9-0-15.html"
>Section E.51</A
>.
</P
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><H2
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><A
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>E.49.2. 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 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
> 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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