RAC & DataGuard (physical pending)

Hi all

I am trying to get a high level overview of how CARS & DataGuard behave in the following configuration. I wrote my understanding of how things work. Please correct me if I'm wrong.

(1) node RAC (primary) 2 with a physical standby of single instance.

(a) same init.ora parameters related Eve would have configured on both nodes main cars.
(b) redo apply service to sleep could merge the redo leave the 2 wires of the primary and apply it to the night before to preserve the synchronization.
(c) during RAC primary instance must be to the top outside of the instance of Eve.
(d) during the downgrade as a primary RAC instance should be in place outside the instance of Eve.
(e) during the failover ofcourse the two primary instances would be down that guarantees the fail on.

(2) node 2 (primary) CARS with a physical standby 2 node

This is when it becomes complex and I'm not really sure how a, b, c, d, e would be in this scenario. Appreciate if you could throw some light on this and the list of what
a, b, c, d, e could look like in this scenario.

I'm assuming that only one instance in the standby THAT CARS should be in place when the watch is in configuration CARS to do it again apply to the work.


Also, if there is a white paper procedure step by step details to put in place the 2 scenarios above, please let me know. So far, I could not find that the MAA white paper, but which was not very helpful. If you prescribe a good book for RAC & DataGuard would be too great...


Thanks for your help

>

(1) node RAC (primary) 2 with a physical standby of single instance.

(a) same init.ora parameters related Eve would have configured on both nodes main cars.

Usually rac nodes share their spfile on a shared diskvolume or through the ASM. So they were all identically DG parameter

(b) redo apply service to sleep could merge the redo leave the 2 wires of the primary and apply it to the night before to preserve the synchronization.

Fix

(c) during RAC primary instance must be to the top outside of the instance of Eve.

Seems logical to me
Edit: actually during normal operation the two RAC nodes are up, so during the transition to digital they are both active too
This is the configuration that is important. As soon as the wait becomes primary, it could be that he only talks to one RAC node for its files of log-apply

(d) during the downgrade as a primary RAC instance should be in place outside the instance of Eve.

This single is the only race in step c.

(e) during the failover ofcourse the two primary instances would be down that guarantees the fail on.

Fix. Remember that during a failover of the RAC config would be déconfigurée the setting of the DG and must be added again as before.

You may need to take a look at: http://www.oracle.com/technology/deploy/availability/pdf/MAA_WP_10g_RACPrimarySingleInstancePhysicalStandby.pdf

>

(2) node 2 (primary) CARS with a physical standby 2 node

This is when it becomes complex and I'm not really sure how a, b, c, d, e would be in this scenario. Appreciate if you could throw some light on this and the list of what
a, b, c, d, e could look like in this scenario.

I'm assuming that only one instance in the standby THAT CARS should be in place when the watch is in configuration CARS to do it again apply to the work.

N ° day before primary RAC RAC would mean that both nodes are in place on both sides. PrimNode1 send its logs of StandbyNode1 recovery and the same for PrimNode2 and StandbyNode2

Have a look here: http://www.oracle.com/technology/deploy/availability/pdf/MAA_WP_10g_RACPrimaryRACPhysicalStandby.pdf

HTH,

FJFranken
My Blog: http://managingoracle.blogspot.com

Published by: fjfranken on July 16, 2010 01:13

Tags: Database

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