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Tuesday, November 15, 2011

Oracle Shutdown


SHUTDOWN THE DATABASE:                                                                              
There are 4 ways to shutdown database

1- SHUTDOWN NORMAL:
  • No new connection can be made
  • Oracle server waits all users to disconnect
  • database and redo buffer written to the disk
  • Background process terminated and SGA remove from memory
  • Oracle closes and dismount database before shutdown
  • Next startup does not require recovery

2- SHUTDOWN TRANSACTIONAL:
  • No new connection can be made
  • User automatically disconnect after completing the transaction in progress
  • When all transaction finished shutdown occur immediately
  • Next startup does not require recovery
3- SHUTDOWM IMMEDIATE:
  • Current SQL statement being processed is not completed
  • Oracle server does not wait for the user who are currently connected to the database
  • Oracle closes and dismount database before shutdown.
  • Next startup does not require recovery

4- SHUTDOWN ABORT:
  • Oracle does not wait for user currently connected to the database
  • Database and redo buffers are not written to the disks
  • The instance terminated without closing the files
  • The database is not close or dismounts
  • Next startup requires instance recovery.

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