Oracle RAC Database QUIESCE Mode

  • Oracle RAC database quiesce mode is only privileged user can login to database and perform operation. It is restricted mode for DBA operations only.
  • To put RAC database in quiesce mode, use ALTER SYSTEM QUIESCE RESTRICTED
  • Above statement affect all instances in RAC. Database Resource Manager feature must be activated. After all non-DBA session become inactive then database considered as quiesced.
  • The instance from which you put RAC database in quiesce mode, from same instance you have to unquiesce database, using ALTER SYSTEM UNQUIESCE
    • If you have executed ALTER SYSTEM QUIESCE RESTRICTED statement, and oracle database has not finished processing it, then you cannot open database.
    • WE cannot open database if it is already quiesced.
    • ALTER SYSTEM QUIESCE RESTRICTED and ALTER SYSTEM UNQUIESCE statement affect all instances in RAC database.
  • Cold backup cannot be taken when database in quiesce mode because oracle background processes may still perform updates for internal purposes. File headers of online datafile continues to appear as if they are being used.
  • Below is snippet of quiescing RAC database and alert log of 2 node RAC database during quiescing RAC database.

  • Alert log of instance 1:


  • Alert log of instance 2:

Reference:




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