'\" t
.\"     Title: DISCARD
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 2019
.\"    Manual: PostgreSQL 12.0 Documentation
.\"    Source: PostgreSQL 12.0
.\"  Language: English
.\"
.TH "DISCARD" "7" "2019" "PostgreSQL 12.0" "PostgreSQL 12.0 Documentation"
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.SH "NAME"
DISCARD \- discard session state
.SH "SYNOPSIS"
.sp
.nf
DISCARD { ALL | PLANS | SEQUENCES | TEMPORARY | TEMP }
.fi
.SH "DESCRIPTION"
.PP
\fBDISCARD\fR
releases internal resources associated with a database session\&. This command is useful for partially or fully resetting the session\*(Aqs state\&. There are several subcommands to release different types of resources; the
\fBDISCARD ALL\fR
variant subsumes all the others, and also resets additional state\&.
.SH "PARAMETERS"
.PP
PLANS
.RS 4
Releases all cached query plans, forcing re\-planning to occur the next time the associated prepared statement is used\&.
.RE
.PP
SEQUENCES
.RS 4
Discards all cached sequence\-related state, including
\fBcurrval()\fR/\fBlastval()\fR
information and any preallocated sequence values that have not yet been returned by
\fBnextval()\fR\&. (See
CREATE SEQUENCE (\fBCREATE_SEQUENCE\fR(7))
for a description of preallocated sequence values\&.)
.RE
.PP
TEMPORARY or TEMP
.RS 4
Drops all temporary tables created in the current session\&.
.RE
.PP
ALL
.RS 4
Releases all temporary resources associated with the current session and resets the session to its initial state\&. Currently, this has the same effect as executing the following sequence of statements:
.sp
.if n \{\
.RS 4
.\}
.nf
CLOSE ALL;
SET SESSION AUTHORIZATION DEFAULT;
RESET ALL;
DEALLOCATE ALL;
UNLISTEN *;
SELECT pg_advisory_unlock_all();
DISCARD PLANS;
DISCARD TEMP;
DISCARD SEQUENCES;
.fi
.if n \{\
.RE
.\}
.RE
.SH "NOTES"
.PP
\fBDISCARD ALL\fR
cannot be executed inside a transaction block\&.
.SH "COMPATIBILITY"
.PP
\fBDISCARD\fR
is a
PostgreSQL
extension\&.