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Fix documentation reference to maximum allowed for autovacuum_freeze_max_age.

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The documentation mentioned setting autovacuum_freeze_max_age to
"its maximum allowed value of a little less than two billion".
This led to a post asking about the exact maximum allowed value,
which is precisely two billion, not "a little less".

Based on question by Radovan Jablonovsky.  Backpatch to 8.3.
This commit is contained in:
Kevin Grittner 2012-09-16 12:21:12 -05:00
parent 3d3218aa3d
commit 17ddb7d65b
1 changed files with 2 additions and 2 deletions
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4
doc/src/sgml/maintenance.sgml
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@ -450,8 +450,8 @@
will take more space, because it must store the commit status of all
transactions back to the <varname>autovacuum_freeze_max_age</> horizon.
The commit status uses two bits per transaction, so if
<varname>autovacuum_freeze_max_age</> is set to its maximum allowed value of
a little less than two billion, <filename>pg_clog</> can be expected to
<varname>autovacuum_freeze_max_age</> is set to its maximum allowed
value of two billion, <filename>pg_clog</> can be expected to
grow to about half a gigabyte. If this is trivial compared to your
total database size, setting <varname>autovacuum_freeze_max_age</> to
its maximum allowed value is recommended. Otherwise, set it depending