While backing up to the Oracle Fast Recovery Area (FRA), you
Determined the backup istaking too long and suspect a performance
Bottleneck. Which three are true about diagnosing and tuning these
Problems? (Choose three.)
A.If an RMAN BACKUP VALIDATE command takesroughly the same time as an正确答案BCD
Actual backup, then both read and write I/O are likely bottlenecks. B.Setting DBWR_IO_SLAVES to a non zero value can improve backup
Performance when using synchronous I/O. C.If an RMAN BACKUP VALIDATE command takes noticeably lessthan an actual
Backup, then write I/O is a likely bottleneck. D.If an RMAN BACKUP VALIDATE command takesroughly the same time as an
Actual backup, then read I/O is a likely bottleneck. E.Data files with a high value in
V$BACKUP_SYNC_IO.DISCRETE_BYTES_PER_SECOND are a potential
Performance bottleneck when synchronous I/O is used. F.Setting DBWR_IO_SLAVES to a non zero value can improve backup
Performance when using asynchronous I/O/ G.Data files with a high value in V$BACKUP_ASYNC_IO.SHORT_WAITS are a
Potential performance bottleneck when asynchronous I/O is used.
