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>E.89. Release 8.4.8</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2011-04-18</P
></DIV
><P
> This release contains a variety of fixes from 8.4.7.
For information about new features in the 8.4 major release, see
<A
HREF="release-8-4.html"
>Section E.97</A
>.
</P
><DIV
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><H2
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><A
NAME="AEN126356"
>E.89.1. Migration to Version 8.4.8</A
></H2
><P
> A dump/restore is not required for those running 8.4.X.
</P
><P
> However, if your installation was upgraded from a previous major
release by running <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>, you should take
action to prevent possible data loss due to a now-fixed bug in
<SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>. The recommended solution is to run
<TT
CLASS="COMMAND"
>VACUUM FREEZE</TT
> on all TOAST tables.
More information is available at <A
HREF="http://wiki.postgresql.org/wiki/20110408pg_upgrade_fix"
TARGET="_top"
> http://wiki.postgresql.org/wiki/20110408pg_upgrade_fix</A
>.
</P
><P
> Also, if you are upgrading from a version earlier than 8.4.2,
see <A
HREF="release-8-4-2.html"
>Section E.95</A
>.
</P
></DIV
><DIV
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><H2
CLASS="SECT2"
><A
NAME="AEN126366"
>E.89.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>'s handling of TOAST tables
(Bruce Momjian)
</P
><P
> The <TT
CLASS="STRUCTNAME"
>pg_class</TT
>.<TT
CLASS="STRUCTFIELD"
>relfrozenxid</TT
> value for
TOAST tables was not correctly copied into the new installation
during <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>. This could later result in
<TT
CLASS="LITERAL"
>pg_clog</TT
> files being discarded while they were still
needed to validate tuples in the TOAST tables, leading to
<SPAN
CLASS="QUOTE"
>"could not access status of transaction"</SPAN
> failures.
</P
><P
> This error poses a significant risk of data loss for installations
that have been upgraded with <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>. This patch
corrects the problem for future uses of <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>,
but does not in itself cure the issue in installations that have been
processed with a buggy version of <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>.
</P
></LI
><LI
><P
> Suppress incorrect <SPAN
CLASS="QUOTE"
>"PD_ALL_VISIBLE flag was incorrectly set"</SPAN
>
warning (Heikki Linnakangas)
</P
><P
> <TT
CLASS="COMMAND"
>VACUUM</TT
> would sometimes issue this warning in cases that
are actually valid.
</P
></LI
><LI
><P
> Disallow including a composite type in itself (Tom Lane)
</P
><P
> This prevents scenarios wherein the server could recurse infinitely
while processing the composite type. While there are some possible
uses for such a structure, they don't seem compelling enough to
justify the effort required to make sure it always works safely.
</P
></LI
><LI
><P
> Avoid potential deadlock during catalog cache initialization
(Nikhil Sontakke)
</P
><P
> In some cases the cache loading code would acquire share lock on a
system index before locking the index's catalog. This could deadlock
against processes trying to acquire exclusive locks in the other,
more standard order.
</P
></LI
><LI
><P
> Fix dangling-pointer problem in <TT
CLASS="LITERAL"
>BEFORE ROW UPDATE</TT
> trigger
handling when there was a concurrent update to the target tuple
(Tom Lane)
</P
><P
> This bug has been observed to result in intermittent <SPAN
CLASS="QUOTE"
>"cannot
extract system attribute from virtual tuple"</SPAN
> failures while trying to
do <TT
CLASS="LITERAL"
>UPDATE RETURNING ctid</TT
>. There is a very small probability
of more serious errors, such as generating incorrect index entries for
the updated tuple.
</P
></LI
><LI
><P
> Disallow <TT
CLASS="COMMAND"
>DROP TABLE</TT
> when there are pending deferred trigger
events for the table (Tom Lane)
</P
><P
> Formerly the <TT
CLASS="COMMAND"
>DROP</TT
> would go through, leading to
<SPAN
CLASS="QUOTE"
>"could not open relation with OID nnn"</SPAN
> errors when the
triggers were eventually fired.
</P
></LI
><LI
><P
> Prevent crash triggered by constant-false WHERE conditions during
GEQO optimization (Tom Lane)
</P
></LI
><LI
><P
> Improve planner's handling of semi-join and anti-join cases
(Tom Lane)
</P
></LI
><LI
><P
> Fix selectivity estimation for text search to account for NULLs
(Jesper Krogh)
</P
></LI
><LI
><P
> Improve PL/pgSQL's ability to handle row types with dropped columns
(Pavel Stehule)
</P
><P
> This is a back-patch of fixes previously made in 9.0.
</P
></LI
><LI
><P
> Fix PL/Python memory leak involving array slices (Daniel Popowich)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
> to cope with long lines (over 1KB) in
TOC files (Tom Lane)
</P
></LI
><LI
><P
> Put in more safeguards against crashing due to division-by-zero
with overly enthusiastic compiler optimization (Aurelien Jarno)
</P
></LI
><LI
><P
> Support use of dlopen() in FreeBSD and OpenBSD on MIPS (Tom Lane)
</P
><P
> There was a hard-wired assumption that this system function was not
available on MIPS hardware on these systems. Use a compile-time test
instead, since more recent versions have it.
</P
></LI
><LI
><P
> Fix compilation failures on HP-UX (Heikki Linnakangas)
</P
></LI
><LI
><P
> Fix version-incompatibility problem with <SPAN
CLASS="APPLICATION"
>libintl</SPAN
> on
Windows (Hiroshi Inoue)
</P
></LI
><LI
><P
> Fix usage of <SPAN
CLASS="APPLICATION"
>xcopy</SPAN
> in Windows build scripts to
work correctly under Windows 7 (Andrew Dunstan)
</P
><P
> This affects the build scripts only, not installation or usage.
</P
></LI
><LI
><P
> Fix path separator used by <SPAN
CLASS="APPLICATION"
>pg_regress</SPAN
> on Cygwin
(Andrew Dunstan)
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2011f
for DST law changes in Chile, Cuba, Falkland Islands, Morocco, Samoa,
and Turkey; also historical corrections for South Australia, Alaska,
and Hawaii.
</P
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