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savepoint
A savepoint is a way of implementing subtransactions (also known as nested transactions) within a relational database management system by indicating a point within a transaction that can be "rolled back to" without affecting any work done in the transaction before the savepoint was created. Multiple savepoints can exist within a single transaction. Savepoints are useful for implementing complex error recovery in database applications — if an error occurs in the midst of a multiple-statement transaction, the application may be able to recover from the error (by rolling back to a savepoint) without needing to abort the entire transaction.
A savepoint can be declared by issuing a SAVEPOINT ''name'' statement. All changes made after a savepoint has been declared can be undone by issuing a ROLLBACK TO SAVEPOINT ''name'' command. Issuing RELEASE SAVEPOINT ''name'' will cause the named savepoint to be discarded, but will not otherwise affect anything. Issuing the commands ROLLBACK or COMMIT will also discard any savepoints created since the start of the main transaction.〔http://docs.oracle.com/cd/B19306_01/appdev.102/b14261/savepoint_statement.htm〕
Savepoints are supported in some form or other in database systems like PostgreSQL, Oracle, Microsoft SQL Server, MySQL, DB2, SQLite (since 3.6.8), Firebird, H2 Database Engine, and Informix (since version 11.50xC3). Savepoints are also defined in the SQL standard.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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