diff --git a/doc/src/sgml/ref/vacuum.sgml b/doc/src/sgml/ref/vacuum.sgml index 6511563523c286587aa138fb641a55243402e59a..f77e1fb6730d906d012e5734123485d81172b4a1 100644 --- a/doc/src/sgml/ref/vacuum.sgml +++ b/doc/src/sgml/ref/vacuum.sgml @@ -1,5 +1,5 @@ <!-- -$Header: /cvsroot/pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.7 1999/12/07 22:41:41 momjian Exp $ +$Header: /cvsroot/pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.8 2000/04/05 21:51:11 momjian Exp $ Postgres documentation --> @@ -51,8 +51,6 @@ VACUUM [ VERBOSE ] ANALYZE [ <replaceable class="PARAMETER">table</replaceable> <para> Updates column statistics used by the optimizer to determine the most efficient way to execute a query. - The statistics represent the disbursion of the data in each column. - This information is valuable when several execution paths are possible. </para> </listitem> </varlistentry> @@ -158,6 +156,13 @@ NOTICE: Index <replaceable class="PARAMETER">index</replaceable>: Pages 28; tuples and number of pages stored in all classes. </para> + + <para> + <command>VACUUM ANALYZE</command> collects statistics representing the + disbursion of the data in each column. + This information is valuable when several query execution paths are possible. + </para> + <para> Running <command>VACUUM</command> periodically will increase the speed of the database in processing user queries. @@ -179,11 +184,12 @@ NOTICE: Index <replaceable class="PARAMETER">index</replaceable>: Pages 28; query may be executed at any time, however. In particular, after copying a large class into <productname>Postgres</productname> or after deleting a large number of - records, it may be a good idea to issue a <command>VACUUM</command> + records, it may be a good idea to issue a <command>VACUUM ANALYZE</command> query. This will update the system catalogs with the results of all recent changes, and allow the <productname>Postgres</productname> query optimizer to make better choices in planning user queries. </para> + </refsect2> </refsect1>