Disables prestarted transactions.

    Use the PRESTARTED TRANSACTIONS ARE OFF clause only if your
    application uses a server process that is attached to the
    database for long periods of time and causes the snapshot file
    to grow excessively. If you use the PRESTARTED TRANSACTIONS
    ARE OFF clause, Oracle Rdb uses additional I/0 because each START
    TRANSACTION statement must reserve a transaction sequence number
    (TSN).