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>E.221. Release 7.4.6</A
></H1
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><P
><B
>Release date: </B
>2004-10-22</P
></DIV
><P
>   This release contains a variety of fixes from 7.4.5.
   For information about new features in the 7.4 major release, see
   <A
HREF="release-7-4.html"
>Section E.227</A
>.
  </P
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>E.221.1. Migration to Version 7.4.6</A
></H2
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>    A dump/restore is not required for those running 7.4.X.
   </P
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>E.221.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
>Repair possible failure to update hint bits on disk</P
><P
>Under rare circumstances this oversight could lead to
<SPAN
CLASS="QUOTE"
>"could not access transaction status"</SPAN
> failures, which qualifies
it as a potential-data-loss bug.</P
></LI
><LI
><P
>Ensure that hashed outer join does not miss tuples</P
><P
>Very large left joins using a hash join plan could fail to output unmatched
left-side rows given just the right data distribution.</P
></LI
><LI
><P
>Disallow running <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
> as root</P
><P
>This is to guard against any possible security issues.</P
></LI
><LI
><P
>Avoid using temp files in <TT
CLASS="FILENAME"
>/tmp</TT
> in <TT
CLASS="COMMAND"
>make_oidjoins_check</TT
></P
><P
>This has been reported as a security issue, though it's hardly worthy of
concern since there is no reason for non-developers to use this script anyway.</P
></LI
><LI
><P
>Prevent forced backend shutdown from re-emitting prior command
result</P
><P
>In rare cases, a client might think that its last command had succeeded when
it really had been aborted by forced database shutdown.</P
></LI
><LI
><P
>Repair bug in <CODE
CLASS="FUNCTION"
>pg_stat_get_backend_idset</CODE
></P
><P
>This could lead to misbehavior in some of the system-statistics views.</P
></LI
><LI
><P
>Fix small memory leak in postmaster</P
></LI
><LI
><P
>Fix <SPAN
CLASS="QUOTE"
>"expected both swapped tables to have TOAST
tables"</SPAN
> bug</P
><P
>This could arise in cases such as CLUSTER after ALTER TABLE DROP COLUMN.</P
></LI
><LI
><P
>Prevent <TT
CLASS="LITERAL"
>pg_ctl restart</TT
> from adding <TT
CLASS="LITERAL"
>-D</TT
> multiple times</P
></LI
><LI
><P
>Fix problem with NULL values in GiST indexes</P
></LI
><LI
><P
><TT
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>::</TT
> is no longer interpreted as a variable in an
ECPG prepare statement</P
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