To quiesce a RAC database, use the ALTER SYSTEM QUIESCE RESTRICTED statement from one instance.
It is not possible to open the database from any instance while the database is in the process of being quiesced from another instance.
After all non-DBA sessions become inactive, the ALTER SYSTEM QUIESCE RESTRICTED statement executes and the database is considered to be quiesced.
In a RAC environment, this statement affects all instances.
Cold backups cannot be taken when the database is in a quiesced state because the Oracle background processes may still perform updates for internal purposes even when the database is in a quiesced state.
Also, the file headers of online data filescontinue to appear as if they are being accessed. They do not look the same as if a clean shutdownwere done.
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