Youcan provide this level of reliability by using a remote mirroring technology
sometimes known as geo-mirroring. Essentially, all writes to the online redo log files
and the control files at the primary site must be mirrored synchronously to the
standby site. For simplicity, youcan also geo-mirror the archived log destination,
which will duplicate the archived logs at the remote site, in effect copying the
archived redo logs from the primary to the standby site. This approach can simplify
operations; you use one solution for all the mirroring requirements, as opposed to
having Oracle copy the archived logs and having geo-mirroring handle the other critical
files.
Geo-mirroring of the online redo logs results in every committed transaction being
written to both the online redo log at the primary site and the copy of the online redo
log at the standby site. This process adds some time to each transaction for the mirrored
write to reach the standby site. Depending on the distance between the sites
and the network used, geo-mirroring can hamper performance, so you should test its
impact on the normal operation of your database.
Pages:
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624