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>Appendix E. Release Notes</TD
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>E.44. Release 9.1.6</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2012-09-24</P
></DIV
><P
> This release contains a variety of fixes from 9.1.5.
For information about new features in the 9.1 major release, see
<A
HREF="release-9-1.html"
>Section E.50</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN118134"
>E.44.1. Migration to Version 9.1.6</A
></H2
><P
> A dump/restore is not required for those running 9.1.X.
</P
><P
> However, you may need to perform <TT
CLASS="COMMAND"
>REINDEX</TT
> operations to
recover from the effects of the data corruption bug described in the
first changelog item below.
</P
><P
> Also, if you are upgrading from a version earlier than 9.1.4,
see <A
HREF="release-9-1-4.html"
>Section E.46</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN118141"
>E.44.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Fix persistence marking of shared buffers during WAL replay
(Jeff Davis)
</P
><P
> This mistake can result in buffers not being written out during
checkpoints, resulting in data corruption if the server later crashes
without ever having written those buffers. Corruption can occur on
any server following crash recovery, but it is significantly more
likely to occur on standby slave servers since those perform much
more WAL replay. There is a low probability of corruption of btree
and GIN indexes. There is a much higher probability of corruption of
table <SPAN
CLASS="QUOTE"
>"visibility maps"</SPAN
>. Fortunately, visibility maps are
non-critical data in 9.1, so the worst consequence of such corruption
in 9.1 installations is transient inefficiency of vacuuming. Table
data proper cannot be corrupted by this bug.
</P
><P
> While no index corruption due to this bug is known to have occurred
in the field, as a precautionary measure it is recommended that
production installations <TT
CLASS="COMMAND"
>REINDEX</TT
> all btree and GIN
indexes at a convenient time after upgrading to 9.1.6.
</P
><P
> Also, if you intend to do an in-place upgrade to 9.2.X, before doing
so it is recommended to perform a <TT
CLASS="COMMAND"
>VACUUM</TT
> of all tables
while having <A
HREF="runtime-config-client.html#GUC-VACUUM-FREEZE-TABLE-AGE"
><TT
CLASS="VARNAME"
>vacuum_freeze_table_age</TT
></A
>
set to zero. This will ensure that any lingering wrong data in the
visibility maps is corrected before 9.2.X can depend on it. <A
HREF="runtime-config-resource.html#GUC-VACUUM-COST-DELAY"
><TT
CLASS="VARNAME"
>vacuum_cost_delay</TT
></A
>
can be adjusted to reduce the performance impact of vacuuming, while
causing it to take longer to finish.
</P
></LI
><LI
><P
> Fix planner's assignment of executor parameters, and fix executor's
rescan logic for CTE plan nodes (Tom Lane)
</P
><P
> These errors could result in wrong answers from queries that scan the
same <TT
CLASS="LITERAL"
>WITH</TT
> subquery multiple times.
</P
></LI
><LI
><P
> Fix misbehavior when <A
HREF="runtime-config-client.html#GUC-DEFAULT-TRANSACTION-ISOLATION"
><TT
CLASS="VARNAME"
>default_transaction_isolation</TT
></A
>
is set to <TT
CLASS="LITERAL"
>serializable</TT
> (Kevin Grittner, Tom Lane, Heikki
Linnakangas)
</P
><P
> Symptoms include crashes at process start on Windows, and crashes in
hot standby operation.
</P
></LI
><LI
><P
> Improve selectivity estimation for text search queries involving
prefixes, i.e. <TT
CLASS="REPLACEABLE"
><I
>word</I
></TT
><TT
CLASS="LITERAL"
>:*</TT
> patterns (Tom Lane)
</P
></LI
><LI
><P
> Improve page-splitting decisions in GiST indexes (Alexander Korotkov,
Robert Haas, Tom Lane)
</P
><P
> Multi-column GiST indexes might suffer unexpected bloat due to this
error.
</P
></LI
><LI
><P
> Fix cascading privilege revoke to stop if privileges are still held
(Tom Lane)
</P
><P
> If we revoke a grant option from some role <TT
CLASS="REPLACEABLE"
><I
>X</I
></TT
>, but
<TT
CLASS="REPLACEABLE"
><I
>X</I
></TT
> still holds that option via a grant from someone
else, we should not recursively revoke the corresponding privilege
from role(s) <TT
CLASS="REPLACEABLE"
><I
>Y</I
></TT
> that <TT
CLASS="REPLACEABLE"
><I
>X</I
></TT
> had granted it
to.
</P
></LI
><LI
><P
> Disallow extensions from containing the schema they are assigned to
(Thom Brown)
</P
><P
> This situation creates circular dependencies that confuse
<SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> and probably other things. It's confusing
for humans too, so disallow it.
</P
></LI
><LI
><P
> Improve error messages for Hot Standby misconfiguration errors
(Gurjeet Singh)
</P
></LI
><LI
><P
> Make <SPAN
CLASS="APPLICATION"
>configure</SPAN
> probe for <CODE
CLASS="FUNCTION"
>mbstowcs_l</CODE
> (Tom
Lane)
</P
><P
> This fixes build failures on some versions of AIX.
</P
></LI
><LI
><P
> Fix handling of <TT
CLASS="LITERAL"
>SIGFPE</TT
> when PL/Perl is in use (Andres Freund)
</P
><P
> Perl resets the process's <TT
CLASS="LITERAL"
>SIGFPE</TT
> handler to
<TT
CLASS="LITERAL"
>SIG_IGN</TT
>, which could result in crashes later on. Restore
the normal Postgres signal handler after initializing PL/Perl.
</P
></LI
><LI
><P
> Prevent PL/Perl from crashing if a recursive PL/Perl function is
redefined while being executed (Tom Lane)
</P
></LI
><LI
><P
> Work around possible misoptimization in PL/Perl (Tom Lane)
</P
><P
> Some Linux distributions contain an incorrect version of
<TT
CLASS="FILENAME"
>pthread.h</TT
> that results in incorrect compiled code in
PL/Perl, leading to crashes if a PL/Perl function calls another one
that throws an error.
</P
></LI
><LI
><P
> Fix bugs in <TT
CLASS="FILENAME"
>contrib/pg_trgm</TT
>'s <TT
CLASS="LITERAL"
>LIKE</TT
> pattern
analysis code (Fujii Masao)
</P
><P
> <TT
CLASS="LITERAL"
>LIKE</TT
> queries using a trigram index could produce wrong
results if the pattern contained <TT
CLASS="LITERAL"
>LIKE</TT
> escape characters.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>'s handling of line endings on Windows
(Andrew Dunstan)
</P
><P
> Previously, <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> might add or remove carriage
returns in places such as function bodies.
</P
></LI
><LI
><P
> On Windows, make <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> use backslash path
separators in the scripts it emits (Andrew Dunstan)
</P
></LI
><LI
><P
> Remove unnecessary dependency on <SPAN
CLASS="APPLICATION"
>pg_config</SPAN
> from
<SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> (Peter Eisentraut)
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2012f
for DST law changes in Fiji
</P
></LI
></UL
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