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Fix ancient docs/comments thinko: XID comparison is mod 2^32, not 2^31.

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Pointed out by Gianni Ciolli.
This commit is contained in:
Tom Lane
2013-12-12 12:40:07 -05:00
parent 884c6384a2
commit 85eb066ecd
2 changed files with 2 additions and 2 deletions
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doc/src/sgml/maintenance.sgml
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@ -356,7 +356,7 @@
<productname>PostgreSQL</productname> distinguishes a special XID
<literal>FrozenXID</>. This XID is always considered older
than every normal XID. Normal XIDs are
compared using modulo-2<superscript>31</> arithmetic. This means
compared using modulo-2<superscript>32</> arithmetic. This means
that for every normal XID, there are two billion XIDs that are
<quote>older</> and two billion that are <quote>newer</>; another
way to say it is that the normal XID space is circular with no