1. Shutdown Normal is normal to close the database. 2, shutdown immediate turns off the database immediately. Execute Shutdown Immediate in SVRMGRL, the database does not turn off immediately, but is turned off after Oracle executes some cleared work (terminating session, release session resources), when using shutdown, Shutdown Immediate can complete the database shutdown . 3, Shutdown Abort directly closes the database, the session that is accessing the database will be suddenly terminated, if there is a lot of operation in the database is being executed, then after Shutdown Abort, restart the database take a long time.
