savepoint(7)

1SAVEPOINT(7)                     SQL Commands                     SAVEPOINT(7)
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NAME

6       SAVEPOINT - define a new savepoint within the current transaction
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SYNOPSIS

10       SAVEPOINT savepoint_name
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DESCRIPTION

14       SAVEPOINT establishes a new savepoint within the current transaction.
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16       A savepoint is a special mark inside a transaction that allows all com‐
17       mands that are executed after it was established  to  be  rolled  back,
18       restoring the transaction state to what it was at the time of the save‐
19       point.
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PARAMETERS

22       savepoint_name
23              The name to give to the new savepoint.
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NOTES

26       Use ROLLBACK TO SAVEPOINT [rollback_to_savepoint(7)] to rollback  to  a
27       savepoint.  Use  RELEASE  SAVEPOINT [release_savepoint(7)] to destroy a
28       savepoint, keeping the effects of commands executed after it was estab‐
29       lished.
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31       Savepoints  can  only  be  established when inside a transaction block.
32       There can be multiple savepoints defined within a transaction.
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EXAMPLES

35       To establish a savepoint and later undo the  effects  of  all  commands
36       executed after it was established:
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38       BEGIN;
39           INSERT INTO table1 VALUES (1);
40           SAVEPOINT my_savepoint;
41           INSERT INTO table1 VALUES (2);
42           ROLLBACK TO SAVEPOINT my_savepoint;
43           INSERT INTO table1 VALUES (3);
44       COMMIT;
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46       The above transaction will insert the values 1 and 3, but not 2.
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48       To establish and later destroy a savepoint:
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50       BEGIN;
51           INSERT INTO table1 VALUES (3);
52           SAVEPOINT my_savepoint;
53           INSERT INTO table1 VALUES (4);
54           RELEASE SAVEPOINT my_savepoint;
55       COMMIT;
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57       The above transaction will insert both 3 and 4.
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COMPATIBILITY

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