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doc: mention vacuum's removal of commit timestamp information

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Reported-by: Kyotaro HORIGUCHI

Discussion: https://postgr.es/m/20180622.172132.230342845.horiguchi.kyotaro@lab.ntt.co.jp

Co-authored-by: Kyotaro HORIGUCHI

Backpatch-through: 16
This commit is contained in:
Bruce Momjian
2023-11-24 17:56:28 -05:00
parent 7471230cc6
commit c136eb0298
1 changed files with 2 additions and 1 deletions
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doc/src/sgml/func.sgml
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@ -25704,7 +25704,8 @@ SELECT collation for ('foo' COLLATE "de_DE");
They only provide useful data when the
<xref linkend="guc-track-commit-timestamp"/> configuration option is
enabled, and only for transactions that were committed after it was
enabled.
enabled. Commit timestamp information is routinely removed during
vacuum.
</para>
<table id="functions-commit-timestamp">