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Commit4a96908

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Document new 9.0 behavior of ANALYZE on inheritance hierarchies.
In particular, note that autovacuum does not yet understand that it mightneed to vacuum inheritance parents as a result of changes to the childtables.
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‎doc/src/sgml/ref/analyze.sgml

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<!--
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$PostgreSQL: pgsql/doc/src/sgml/ref/analyze.sgml,v 1.29 2010/04/03 07:22:57 petere Exp $
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$PostgreSQL: pgsql/doc/src/sgml/ref/analyze.sgml,v 1.30 2010/06/15 18:43:35 rhaas Exp $
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PostgreSQL documentation
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-->
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@@ -176,6 +176,17 @@ ANALYZE [ VERBOSE ] [ <replaceable class="PARAMETER">table</replaceable> [ ( <re
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<command>ALTER TABLE ... ALTER COLUMN ... SET (n_distinct = ...)</>
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(see <xref linkend="sql-altertable">).
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</para>
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<para>
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If the table being analyzed has one or more children,
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<command>ANALYZE</command> will gather statistics twice: once on the
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rows of the parent table only, and a second time on the rows of the
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parent table with all of its children. The autovacuum daemon, however,
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will only consider inserts or updates on the parent table when deciding
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whether to trigger an automatic analyze. If that table is rarely
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inserted into or updated, the inheritance statistics will not be up to date
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unless you run <command>ANALYZE</command> manually.
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</para>
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</refsect1>
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<refsect1>

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