Question: What do
I do to minimize the downtime when performing a database
recovery? I have a very large database and we cannot
be down for a long period of time when restoring a bas file
and rolling forward. What are some of the low downtime
options for recovering an Oracle database?
Answer: The best way to minimize
downtime, is to never be in a position to recover the
database. If your downtime costs exceed $100,000 per
minute, then triple mirroring your disks is a great way to
prevent data loss at the disk level (although you are still
at-risk from logical corruption, but this is quite rare).
Also, read my important notes on
Oracle failover approaches to recovery.
That, combined with a server that has redundant RAM and
CPU, and you are fully protected against a recovery, all at
the hardware level.
Other tools and techniques to use to minimize downtime for a recovery
include:
- Frequent full hot backups:
This approach minimizes the time to apply archived redo
logs when performing a database recovery.
- Standby database: You can use
Data Guard, Streams, or GoldenGate replication to make a
current standby database for a fast failover.
- RAC: RAC only protects you
against instance failure, and you still have a common
database (and data files) to manage.
- Fast Recovery Area (FRA):
Oracle has the
flash recovery area for fast recoveries.
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