RE: RAC clarifications
- From: D'Hooge Freek <Freek.DHooge@xxxxxxxxx>
- To: "jason.arneil@xxxxxxxxx" <jason.arneil@xxxxxxxxx>, "cicciuxdba@xxxxxxxxx" <cicciuxdba@xxxxxxxxx>
- Date: Sat, 19 Dec 2009 14:38:17 +0100
About the patching. Most of the patches seems to be rolling upgrades, which
means that no entire cluster downtime is required. But you still need to stop
the instances/clusterware node per node.
And here lies the problem, most applications are not rac "aware" and can't
transparent deal with the failover of a session from one node to another (which
is also the reason why so many applications still have some downtime when a rac
node fails).
The same applies for dataguard.
If your application properly supports fan/fcf, then you will need very little
maintenance downtime with rac. I if doesn't, then you probably will need more
downtime (more layers to patch) then with a single node configuration (in which
case dataguard may be a better solution).
Regards,
Freek D'Hooge
Uptime
Oracle Database Administrator
email: freek.dhooge@xxxxxxxxx
tel +32(0)3 451 23 82
http://www.uptime.be
disclaimer: www.uptime.be/disclaimer
--
//www.freelists.org/webpage/oracle-l
Other related posts:
