'\" t
.\"     Title: ROLLBACK PREPARED
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
.\"      Date: 2016
.\"    Manual: PostgreSQL 9.5.2 Documentation
.\"    Source: PostgreSQL 9.5.2
.\"  Language: English
.\"
.TH "ROLLBACK PREPARED" "5sql" "2016" "PostgreSQL 9.5.2" "PostgreSQL 9.5.2 Documentation"
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.SH "NAME"
ROLLBACK_PREPARED \- cancel a transaction that was earlier prepared for two\-phase commit
.SH "SYNOPSIS"
.sp
.nf
ROLLBACK PREPARED \fItransaction_id\fR
.fi
.SH "DESCRIPTION"
.PP

\fBROLLBACK PREPARED\fR
rolls back a transaction that is in prepared state\&.
.SH "PARAMETERS"
.PP
\fItransaction_id\fR
.RS 4
The transaction identifier of the transaction that is to be rolled back\&.
.RE
.SH "NOTES"
.PP
To roll back a prepared transaction, you must be either the same user that executed the transaction originally, or a superuser\&. But you do not have to be in the same session that executed the transaction\&.
.PP
This command cannot be executed inside a transaction block\&. The prepared transaction is rolled back immediately\&.
.PP
All currently available prepared transactions are listed in the
pg_prepared_xacts
system view\&.
.SH "EXAMPLES"
.PP
Roll back the transaction identified by the transaction identifier
foobar:
.sp
.if n \{\
.RS 4
.\}
.nf
ROLLBACK PREPARED \(aqfoobar\(aq;
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP

\fBROLLBACK PREPARED\fR
is a
PostgreSQL
extension\&. It is intended for use by external transaction management systems, some of which are covered by standards (such as X/Open XA), but the SQL side of those systems is not standardized\&.
.SH "SEE ALSO"
PREPARE TRANSACTION (\fBPREPARE_TRANSACTION\fR(5)), COMMIT PREPARED (\fBCOMMIT_PREPARED\fR(5))