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ti-chi-bot merged 3 commits into from
Apr 19, 2024
Merged

ebnf savepoint (#17083) #17241

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ebnf savepoint
dveeden Apr 9, 2024
52d4bd8
Add note about rollback work
dveeden Apr 9, 2024
9c84e79
wording updates
qiancai Apr 18, 2024
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15 changes: 15 additions & 0 deletions sql-statements/sql-statement-savepoint.md
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Expand Up @@ -36,6 +36,19 @@ RELEASE SAVEPOINT identifier

After the transaction is committed or rolled back, all savepoints in the transaction will be deleted.

## Synopsis

```ebnf+diagram
SavepointStmt ::=
"SAVEPOINT" Identifier

RollbackToStmt ::=
"ROLLBACK" "TO" "SAVEPOINT"? Identifier

ReleaseSavepointStmt ::=
"RELEASE" "SAVEPOINT" Identifier
```

## Examples

Create a table `t1`:
Expand Down Expand Up @@ -141,6 +154,8 @@ SELECT * FROM t1;

When `ROLLBACK TO SAVEPOINT` is used to roll back a transaction to a specified savepoint, MySQL releases the locks held only after the specified savepoint, while in TiDB pessimistic transaction, TiDB does not immediately release the locks held after the specified savepoint. Instead, TiDB releases all locks when the transaction is committed or rolled back.

TiDB does not support the MySQL syntax `ROLLBACK WORK TO SAVEPOINT ...`.

## See also

* [COMMIT](/sql-statements/sql-statement-commit.md)
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