Hello,
I'm in a 11gR2 .In the same host (and Solaris 10 ) where exist different instances under the same $ORACLE_HOME i have to use V$BACKUP_SYNC_IO or V$BACKUP_ASYNC_IO depending on the instance i connect
What's determine this behaviors ? I don´t understand hot to enable Sync or Async .
I've read:
https://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmtunin.htm#BRADV89862
With synchronous I/O, it is difficult to identify specific bottlenecks because all synchronous I/O is a bottleneck to the process
if you see data in V$BACKUP_SYNC_IO, then the problem is that you have not enabled asynchronous I/O or you are not using disk I/O slaves.
thnaks to all and regards.
Francesco