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doc: mention dependency on collation libraries

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Document that index storage is dependent on the operating system's
collation library ordering, and any change in that ordering can create
invalid indexes.

Discussion: 20160617154311.GB19359@momjian.us

Backpatch-through: 9.1
This commit is contained in:
Bruce Momjian 2016-07-02 11:22:36 -04:00
parent 40d0bd8d5e
commit e612181686
1 changed files with 9 additions and 0 deletions
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doc/src/sgml/runtime.sgml
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@ -183,6 +183,15 @@ postgres$ <userinput>initdb -D /usr/local/pgsql/data</userinput>
locale setting. For details see <xref linkend="multibyte">.
</para>
<para>
Non<literal>C</> and and non-<literal>POSIX</> locales rely on the
operating system's collation library for character set ordering.
This controls the ordering of keys stored in indexes. For this reason,
a cluster cannot switch to an incompatible collation library version,
either through snapshot restore, binary streaming replication, or
<application>pg_upgrade</> run.
</para>
<sect2 id="creating-cluster-mount-points">
<title>Use of Secondary File Systems</title>