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.

savepoint_name

Notes

Use ROLLBACK TO SAVEPOINT to rollback to a savepoint. Use to destroy a savepoint, keeping the effects of commands executed after it was established.

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:

To establish and later destroy a savepoint:

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 Greenplum Database, 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 ROLLBACK TO SAVEPOINT and .) Otherwise, SAVEPOINT is fully SQL conforming.

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