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Aggressively freeze tables when CLUSTER or VACUUM FULL rewrites them.

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We haven't wanted to do this in the past on the grounds that in rare
cases the original xmin value will be needed for forensic purposes, but
commit 37484ad2aa removes that objection,
so now we can.

Per extensive discussion, among many people, on pgsql-hackers.
This commit is contained in:
Robert Haas
2014-01-02 15:09:21 -05:00
parent 4cf81b737d
commit 3cff1879f8
5 changed files with 22 additions and 31 deletions
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4
doc/src/sgml/ref/vacuum.sgml
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@ -102,7 +102,9 @@ VACUUM [ FULL ] [ FREEZE ] [ VERBOSE ] ANALYZE [ <replaceable class="PARAMETER">
Specifying <literal>FREEZE</literal> is equivalent to performing
<command>VACUUM</command> with the
<xref linkend="guc-vacuum-freeze-min-age"> parameter
set to zero.
set to zero. Aggressive freezing is always performed when the
table is rewritten, so this option is redundant when <literal>FULL</>
is specified.
</para>
</listitem>
</varlistentry>