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-.\" This is -*-nroff-*-
-.\" XXX standard disclaimer belongs here....
-.TH PURGE SQL 11/05/95 Postgres95 Postgres95
-.SH NAME
-purge \(em discard historical data
-.SH SYNOPSIS
-.nf
-\fBpurge\fR classname [ \fBbefore\fR abstime ] [ \fBafter\fR reltime ]
-.fi
-.SH DESCRIPTION
-.BR Purge
-allows a user to specify the historical retention properties of a
-class.  If the date specified is an absolute time such as \*(lqJan 1
-1987\*(rq, Postgres will discard tuples whose validity expired before
-the indicated time.
-.BR Purge 
-with no
-.IR before
-clause is equivalent to \*(lqpurge before now\*(rq. Until specified
-with a purge command, instance preservation defaults to
-\*(lqforever\*(rq.
-.PP
-The user may purge a class at any time as long as the purge date never
-decreases.  Postgres will enforce this restriction, silently.
-.PP
-Note that the 
-.BR purge
-command does not do anything except set a parameter for system 
-operation.  Use
-.IR vacuum (l)
-to enforce this parameter.
-.SH EXAMPLE
-.nf
---
---Always discard data in the EMP class
---prior to January 1, 1989
---
-purge EMP before "Jan 1 1989"
-.fi
-.nf
---
---Retain only the current data in EMP
---
-purge EMP
-.fi
-.SH "SEE ALSO"
-vacuum(l).
-.SH "BUGS AND CAVEATS"
-Error messages are quite unhelpful.  A complaint about
-\*(lqinconsistent times\*(rq followed by several nine-digit numbers
-indicates an attempt to \*(lqback up\*(rq a purge date on a relation.
-.PP
-You cannot purge certain system catalogs (namely, \*(lqpg_class\*(rq,
-\*(lqpg_attribute\*(rq, \*(lqpg_am\*(rq, and \*(lqpg_amop\*(rq) due 
-to circularities in the system catalog code.
-.PP
-This definition of the 
-.BR purge
-command is really only useful for non-archived relations, since 
-tuples will not be discarded from archive relations (they are 
-never vacuumed).