SAVEPOINT

    Description

    establishes a new savepoint within the current transaction.

    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.

    The name of the new savepoint.

    Notes

    Savepoints can only be established when inside a transaction block. There can be multiple savepoints defined within a transaction.

    To establish a savepoint and later undo the effects of all commands executed after it was established:

    The above transaction will insert the values 1 and 3, but not 2.

    The above transaction will insert both 3 and 4.

    Compatibility

    SQL requires a savepoint to be destroyed automatically when another savepoint with the same name is established. In HAWQ, the old savepoint is kept, though only the more recent one will be used when rolling back or releasing. (Releasing the newer savepoint will cause the older one to again become accessible to and RELEASE SAVEPOINT.) Otherwise, SAVEPOINT is fully SQL conforming.

    , COMMIT, , RELEASE SAVEPOINT,