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Commite612181

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doc: mention dependency on collation libraries
Document that index storage is dependent on the operating system'scollation library ordering, and any change in that ordering can createinvalid indexes.Discussion: 20160617154311.GB19359@momjian.usBackpatch-through: 9.1
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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>
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locale setting. For details see <xref linkend="multibyte">.
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</para>
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<para>
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Non<literal>C</> and and non-<literal>POSIX</> locales rely on the
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operating system's collation library for character set ordering.
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This controls the ordering of keys stored in indexes. For this reason,
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a cluster cannot switch to an incompatible collation library version,
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either through snapshot restore, binary streaming replication, or
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<application>pg_upgrade</> run.
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</para>
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<sect2 id="creating-cluster-mount-points">
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<title>Use of Secondary File Systems</title>
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