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><B
>Release date: </B
>2015-06-12</P
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> 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
>.
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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
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> However, if you are upgrading from a version earlier than 9.1.16,
see <A
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>Section E.34</A
>.
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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
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> With just the wrong timing of concurrent activity, a <TT
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>VACUUM
FULL</TT
> on a system catalog might fail to update the <SPAN
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>"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
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> Avoid deadlock between incoming sessions and <TT
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>CREATE/DROP
DATABASE</TT
> (Tom Lane)
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> A new session starting in a database that is the target of
a <TT
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>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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