Re: Does RMAN needs tablespace in hot backup mode??
From: Murali <oraclems_at_hotmail.com>
Date: 6 Dec 2001 07:28:18 -0800
Message-ID: <22e6597b.0112060728.5dfff97d_at_posting.google.com>
Date: 6 Dec 2001 07:28:18 -0800
Message-ID: <22e6597b.0112060728.5dfff97d_at_posting.google.com>
>(in another word, temporarily freeze the datafiles during backup
> and let the changes be written to redo log files).
Not to quibble, but only the datafile headers are frozen (checkpoints do not update the SCN in the header, so that Oracle knows where to start the recovery from). DBWR still keeps writing dirty buffers from the buffer cache to the datafiles belonging to the tablespace which is in backup mode. Only, instead of just the changes in a block being written to the redo log files, the whole block is written, generating more redo.
Murali Received on Thu Dec 06 2001 - 16:28:18 CET