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>Appendix E. Release Notes</TD
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><A
NAME="RELEASE-9-0-4"
>E.70. Release 9.0.4</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2011-04-18</P
></DIV
><P
> This release contains a variety of fixes from 9.0.3.
For information about new features in the 9.0 major release, see
<A
HREF="release-9-0.html"
>Section E.74</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN122929"
>E.70.1. Migration to Version 9.0.4</A
></H2
><P
> A dump/restore is not required for those running 9.0.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
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN122937"
>E.70.2. 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
> Use better SQLSTATE error codes for hot standby conflict cases
(Tatsuo Ishii and Simon Riggs)
</P
><P
> All retryable conflict errors now have an error code that indicates
that a retry is possible. Also, session closure due to the database
being dropped on the master is now reported as
<TT
CLASS="LITERAL"
>ERRCODE_DATABASE_DROPPED</TT
>, rather than
<TT
CLASS="LITERAL"
>ERRCODE_ADMIN_SHUTDOWN</TT
>, so that connection poolers can
handle the situation correctly.
</P
></LI
><LI
><P
> Prevent intermittent hang in interactions of startup process with
bgwriter process (Simon Riggs)
</P
><P
> This affected recovery in non-hot-standby cases.
</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
> Allow <SPAN
CLASS="QUOTE"
>"replication"</SPAN
> as a user name in
<TT
CLASS="FILENAME"
>pg_hba.conf</TT
> (Andrew Dunstan)
</P
><P
> <SPAN
CLASS="QUOTE"
>"replication"</SPAN
> is special in the database name column, but it
was mistakenly also treated as special in the user name column.
</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 handling of <TT
CLASS="LITERAL"
>SELECT FOR UPDATE</TT
> in a sub-SELECT
(Tom Lane)
</P
><P
> This bug typically led to <SPAN
CLASS="QUOTE"
>"cannot extract system attribute from
virtual tuple"</SPAN
> errors.
</P
></LI
><LI
><P
> Fix selectivity estimation for text search to account for NULLs
(Jesper Krogh)
</P
></LI
><LI
><P
> Fix get_actual_variable_range() to support hypothetical indexes
injected by an index adviser plugin (Gurjeet Singh)
</P
></LI
><LI
><P
> Fix PL/Python memory leak involving array slices (Daniel Popowich)
</P
></LI
><LI
><P
> Allow <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>'s SSL initialization to succeed when
user's home directory is unavailable (Tom Lane)
</P
><P
> If the SSL mode is such that a root certificate file is not required,
there is no need to fail. This change restores the behavior to what
it was in pre-9.0 releases.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> to return a useful error message for errors
detected in <CODE
CLASS="FUNCTION"
>conninfo_array_parse</CODE
> (Joseph Adams)
</P
><P
> A typo caused the library to return NULL, rather than the
<TT
CLASS="STRUCTNAME"
>PGconn</TT
> structure containing the error message, to the
application.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
> preprocessor's handling of float constants
(Heikki Linnakangas)
</P
></LI
><LI
><P
> Fix parallel <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
> to handle comments on
POST_DATA items correctly (Arnd Hannemann)
</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
> Avoid crash when trying to write to the Windows console very early
in process startup (Rushabh Lathia)
</P
></LI
><LI
><P
> Support building with MinGW 64 bit compiler for Windows
(Andrew Dunstan)
</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
></LI
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