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+.\" This is -*-nroff-*-
+.\" XXX standard disclaimer belongs here....
+.\" $Header: /cvsroot/pgsql/doc/man/Attic/vacuum.l,v 1.1.1.1 1996/08/18 22:14:28 scrappy Exp $
+.TH VACUUM SQL 11/05/95 Postgres95 Postgres95
+.SH NAME
+vacuum \(em vacuum a database
+.SH SYNOPSIS
+.nf
+\fBvacuum\fP
+.fi
+.SH DESCRIPTION
+.BR Vacuum
+is the Postgres vacuum cleaner.  It opens every class in the database,
+moves deleted records to the archive for archived relations, cleans
+out records from aborted transactions, and updates statistics in the
+system catalogs.  The statistics maintained include the number of
+tuples and number of pages stored in all classes.  Running
+.BR vacuum
+periodically will increase Postgres's speed in processing user queries.
+.PP
+The open database is the one that is vacuumed.  
+.PP
+We recommend that production databases be vacuumed nightly, in order
+to keep statistics relatively current.  The
+.BR vacuum
+query may be executed at any time, however.  In particular, after
+copying a large class into Postgres or deleting a large number of
+records, it may be a good idea to issue a
+.BR vacuum
+query.  This will update the system catalogs with the results of all
+recent changes, and allow the Postgres query optimizer to make better
+choices in planning user queries.
+.SH "SEE ALSO"
+vacuum(1).