<listitem>

<para>

Only calculate statistics for use by the optimizer (no vacuum),

like <option>--analyze-only</option>. Runseveral (currentlythree)

like <option>--analyze-only</option>. Run three

stages of analyze; the first stage uses the lowest possible statistics

target (see <xref linkend="guc-default-statistics-target"/>)

to produce usable statistics faster, and subsequent stages build the

full statistics.

</para>

<para>

This option is only useful to analyze a database thatcurrent has

no statistics or wholly incorrect ones, such as if it is newly

This option is only useful to analyze a database thatcurrently has

no statistics orhaswholly incorrect ones, such as if it is newly

populated from a restored dump or by <command>pg_upgrade</command>.

Be aware that running this option in a database with existing

Be aware that runningwiththis option in a database with existing

statistics may cause the query optimizer choices to become

transiently worse due to the low statistics targets of the early

stages.