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>SAVEPOINT</H1
><DIV
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><A
NAME="AEN83383"
></A
><H2
>Name</H2
>SAVEPOINT&nbsp;--&nbsp;define a new savepoint within the current transaction</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN83386"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>SAVEPOINT <TT
CLASS="REPLACEABLE"
><I
>savepoint_name</I
></TT
></PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN83389"
></A
><H2
>Description</H2
><P
>   <TT
CLASS="COMMAND"
>SAVEPOINT</TT
> establishes a new savepoint within
   the current transaction.
  </P
><P
>   A savepoint is a special mark inside a transaction that allows all commands
   that are executed after it was established to be rolled back, restoring
   the transaction state to what it was at the time of the savepoint.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN83394"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>savepoint_name</I
></TT
></DT
><DD
><P
>      The name to give to the new savepoint.
     </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN83402"
></A
><H2
>Notes</H2
><P
>   Use <A
HREF="sql-rollback-to.html"
>ROLLBACK TO SAVEPOINT</A
> to
   rollback to a savepoint.  Use <A
HREF="sql-release-savepoint.html"
>RELEASE SAVEPOINT</A
>
   to destroy a savepoint, keeping
   the effects of commands executed after it was established.
  </P
><P
>   Savepoints can only be established when inside a transaction block.
   There can be multiple savepoints defined within a transaction.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN83408"
></A
><H2
>Examples</H2
><P
>   To establish a savepoint and later undo the effects of all commands executed
   after it was established:
</P><PRE
CLASS="PROGRAMLISTING"
>BEGIN;
    INSERT INTO table1 VALUES (1);
    SAVEPOINT my_savepoint;
    INSERT INTO table1 VALUES (2);
    ROLLBACK TO SAVEPOINT my_savepoint;
    INSERT INTO table1 VALUES (3);
COMMIT;</PRE
><P>
   The above transaction will insert the values 1 and 3, but not 2.
  </P
><P
>   To establish and later destroy a savepoint:
</P><PRE
CLASS="PROGRAMLISTING"
>BEGIN;
    INSERT INTO table1 VALUES (3);
    SAVEPOINT my_savepoint;
    INSERT INTO table1 VALUES (4);
    RELEASE SAVEPOINT my_savepoint;
COMMIT;</PRE
><P>
   The above transaction will insert both 3 and 4.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN83414"
></A
><H2
>Compatibility</H2
><P
>   SQL requires a savepoint to be destroyed automatically when another
   savepoint with the same name is established.  In
   <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>, the old savepoint is kept, though only the more
   recent one will be used when rolling back or releasing.  (Releasing the
   newer savepoint with <TT
CLASS="COMMAND"
>RELEASE SAVEPOINT</TT
> will cause the older one
   to again become accessible to <TT
CLASS="COMMAND"
>ROLLBACK TO SAVEPOINT</TT
> and
   <TT
CLASS="COMMAND"
>RELEASE SAVEPOINT</TT
>.) Otherwise, <TT
CLASS="COMMAND"
>SAVEPOINT</TT
> is
   fully SQL conforming.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN83422"
></A
><H2
>See Also</H2
><A
HREF="sql-begin.html"
>BEGIN</A
>, <A
HREF="sql-commit.html"
>COMMIT</A
>, <A
HREF="sql-release-savepoint.html"
>RELEASE SAVEPOINT</A
>, <A
HREF="sql-rollback.html"
>ROLLBACK</A
>, <A
HREF="sql-rollback-to.html"
>ROLLBACK TO SAVEPOINT</A
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