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<Chapter Id="runtime">
times the value of <varname>SORT_MEM</varname>. Sort operations are used
by <literal>ORDER BY</>, merge joins, and <command>CREATE INDEX</>.
Hash tables are used in hash joins, hash-based aggregation, and
- hash-based processing of <literal>IN</> subqueries.
+ hash-based processing of <literal>IN</> subqueries. Because
+ <command>CREATE INDEX</> is used when restoring a database, it might
+ be good to temporary increase this value during a restore.
</para>
</listitem>
</varlistentry>