Remember that once you disable archive log mode you
need to take a fresh backup once archive log mode is turned back on.
The Oracle documentation says the following about enabling and disabling archive
logging in RAC environments:"To
enable archive logging in RAC environments, the database
must be mounted but not open. Then start RAC in a disabled
state. To do this:
Disabling Archive log mode:
1. Shut down all instances.
2. Reset the CLUSTER_DATABASE parameter to false on one
instance. If you are using the server parameter file, make a sid-specific entry
for this.
3. Add settings for the LOG_ARCHIVE_DEST_n,
LOG_ARCHIVE_FORMAT, and LOG_ARCHIVE_START parameters to the parameter file. You
can multiplex the destination to up to ten locations, and the LOG_ARCHIVE_FORMAT
parameter should contain the %t parameter to include the thread number in the
archived log file name.
4. Start up the instance on which you have set
CLUSTER_DATABASE to false.
5. Enter the following statement:
ALTER DATABASE ARCHIVELOG
6. Shut down the instance.
7. Change the value of the CLUSTER_DATABASE parameter to
true.
8. Restart your instances.
These steps should allow you to disable archive log mode.
To disable archive logging, follow the same steps but use
the NOARCHIVELOG clause of the ALTER DATABASE statement."
