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>ROLLBACK PREPARED</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN77272"
></A
><H2
>Name</H2
>ROLLBACK PREPARED&nbsp;--&nbsp;cancel a transaction that was earlier prepared for two-phase commit</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN77277"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ROLLBACK PREPARED <TT
CLASS="REPLACEABLE"
><I
>transaction_id</I
></TT
></PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN77280"
></A
><H2
>Description</H2
><P
>   <TT
CLASS="COMMAND"
>ROLLBACK PREPARED</TT
> rolls back a transaction that is in
   prepared state.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN77284"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>transaction_id</I
></TT
></DT
><DD
><P
>      The transaction identifier of the transaction that is to be
      rolled back.
     </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN77292"
></A
><H2
>Notes</H2
><P
>   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.
  </P
><P
>   This command cannot be executed inside a transaction block. The prepared
   transaction is rolled back immediately.
  </P
><P
>   All currently available prepared transactions are listed in the
   <A
HREF="view-pg-prepared-xacts.html"
><TT
CLASS="STRUCTNAME"
>pg_prepared_xacts</TT
></A
>
   system view.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="SQL-ROLLBACK-PREPARED-EXAMPLES"
></A
><H2
>Examples</H2
><P
>   Roll back the transaction identified by the transaction
   identifier <TT
CLASS="LITERAL"
>foobar</TT
>:

</P><PRE
CLASS="PROGRAMLISTING"
>ROLLBACK PREPARED 'foobar';</PRE
><P></P
></DIV
><DIV
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><A
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></A
><H2
>Compatibility</H2
><P
>   <TT
CLASS="COMMAND"
>ROLLBACK PREPARED</TT
> is a
   <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 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.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN77309"
></A
><H2
>See Also</H2
><A
HREF="sql-prepare-transaction.html"
>PREPARE TRANSACTION</A
>, <A
HREF="sql-commit-prepared.html"
>COMMIT PREPARED</A
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