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  6. RELEASE SAVEPOINT

RELEASE SAVEPOINT

Function

RELEASE SAVEPOINT destroys a savepoint previously defined in the current transaction.

Destroying a savepoint makes it unavailable as a rollback point, but it has no other user visible behavior. It does not undo the effects of commands executed after the savepoint was established. To do that, use ROLLBACK TO SAVEPOINT. Destroying a savepoint when it is no longer needed allows the system to reclaim some resources earlier than transaction end.

RELEASE SAVEPOINT also destroys all savepoints that were established after the named savepoint was established.

Precautions

  • Specifying a savepoint name that was not previously defined causes an error.
  • It is not possible to release a savepoint when the transaction is in an aborted state.
  • If multiple savepoints have the same name, only the one that was most recently defined is released.

Syntax

RELEASE [ SAVEPOINT ] savepoint_name;

Parameter Description

savepoint_name

Specifies the name of the savepoint you want to destroy.

Examples

-- Create a table:
CREATE TABLE tpcds.table1(a int);

-- Start a transaction:
START TRANSACTION;

-- Insert data:
INSERT INTO tpcds.table1 VALUES (3);

-- Establish a savepoint:
SAVEPOINT my_savepoint;

-- Insert data:
INSERT INTO tpcds.table1 VALUES (4);

-- Delete the savepoint:
RELEASE SAVEPOINT my_savepoint;

-- Submit the transaction:
COMMIT;

-- Query the table content, which should contain both 3 and 4.
SELECT * FROM tpcds.table1;

-- Delete the tables:
DROP TABLE tpcds.table1;