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Copy-edit vacuuumdb --analyze-in-stages doc blurb 

I had made a few typos, and Nikolai Berkoff made a wording change
suggestion.

Discussion: https://postgr.es/m/VMwe7-sGegrQPQ7fJjSCdsEbESKeJFOb6G4DFxxNrf45I7DzHio7sNUH88wWRMnAy5a5G0-FB31dxPM47ldigW6WdiCPncHgqO9bNl6F240=@pm.me
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Alvaro Herrera 2021-11-26 14:42:15 -03:00
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doc/src/sgml/ref/vacuumdb.sgml
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@ -397,7 +397,7 @@ PostgreSQL documentation
<listitem> <listitem>
<para> <para>
Only calculate statistics for use by the optimizer (no vacuum), Only calculate statistics for use by the optimizer (no vacuum),
like <option>--analyze-only</option>. Run several (currently three) like <option>--analyze-only</option>. Run three
stages of analyze; the first stage uses the lowest possible statistics stages of analyze; the first stage uses the lowest possible statistics
target (see <xref linkend="guc-default-statistics-target"/>) target (see <xref linkend="guc-default-statistics-target"/>)
to produce usable statistics faster, and subsequent stages build the to produce usable statistics faster, and subsequent stages build the
@ -405,10 +405,10 @@ PostgreSQL documentation
</para> </para>
<para> <para>
This option is only useful to analyze a database that current has This option is only useful to analyze a database that currently has
no statistics or wholly incorrect ones, such as if it is newly no statistics or has wholly incorrect ones, such as if it is newly
populated from a restored dump or by <command>pg_upgrade</command>. 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 running with this option in a database with existing
statistics may cause the query optimizer choices to become statistics may cause the query optimizer choices to become
transiently worse due to the low statistics targets of the early transiently worse due to the low statistics targets of the early
stages. stages.