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ROLLBACK and ROLLBACK ALL rescind all or part of the operations of a
transaction (a series of ISAM database operations).
 
ROLLBACK [savepoint%]
ROLLBACK ALL
    ■ The argument savepoint% is a number that identifies a savepoint
      within a transaction--a series of ISAM database operations that
      is either committed as a whole or rescinded.
    ■ Use SAVEPOINT to designate a savepoint, which marks the beginning
      of a subset of operations that can be rescinded.
 
Usage Notes
    ■ If you specify a savepoint% argument, ROLLBACK returns the data
      affected by the transaction to its state at that savepoint.
    ■ If you do not specify a savepoint% argument, ROLLBACK returns the data
      affected by the transaction to its state at the previous savepoint, or
      at the beginning of the transaction if there are no intermediate
      savepoints.
    ■ ROLLBACK ALL rescinds all ISAM operations in a transaction and returns
      the data to its initial state at the beginning of the transaction.
    ■ Use BEGINTRANS to indicate the beginning of a transaction.
    ■ Use COMMITTRANS to commit all operations since the most recent
      BEGINTRANS.