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>Appendix E. Release Notes</TD
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>E.32. Release 9.1.18</A
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><B
>Release date: </B
>2015-06-12</P
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><P
>   This release contains a small number of fixes from 9.1.17.
   For information about new features in the 9.1 major release, see
   <A
HREF="release-9-1.html"
>Section E.50</A
>.
  </P
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>E.32.1. Migration to Version 9.1.18</A
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>    A dump/restore is not required for those running 9.1.X.
   </P
><P
>    However, if you are upgrading from a version earlier than 9.1.16,
    see <A
HREF="release-9-1-16.html"
>Section E.34</A
>.
   </P
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>E.32.2. Changes</A
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><P
>      Fix rare failure to invalidate relation cache init file (Tom Lane)
     </P
><P
>      With just the wrong timing of concurrent activity, a <TT
CLASS="COMMAND"
>VACUUM
      FULL</TT
> on a system catalog might fail to update the <SPAN
CLASS="QUOTE"
>"init file"</SPAN
>
      that's used to avoid cache-loading work for new sessions.  This would
      result in later sessions being unable to access that catalog at all.
      This is a very ancient bug, but it's so hard to trigger that no
      reproducible case had been seen until recently.
     </P
></LI
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>      Avoid deadlock between incoming sessions and <TT
CLASS="LITERAL"
>CREATE/DROP
      DATABASE</TT
> (Tom Lane)
     </P
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>      A new session starting in a database that is the target of
      a <TT
CLASS="COMMAND"
>DROP DATABASE</TT
> command, or is the template for
      a <TT
CLASS="COMMAND"
>CREATE DATABASE</TT
> command, could cause the command to wait
      for five seconds and then fail, even if the new session would have
      exited before that.
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