Can read-only standby be cascaded from another DR physical standby

we are going to have one two-node RAC database in the primary site (site A), one Data Guard maintained standby database in the DR site (site B) and one ACTIVE Data Guard maintained read-only database for reporting (site C, on the same subnet as site B). My question is what is the best practice for the data guard configuration in terms of the redo log transportation, Is it possible to set up relay of redo log transport from one physical standby to another (database version 11gR2, data guard in Maximum Performance Mode):
1)     A->B->C (minimum overhead to primary site A, maximum delay to report site C)
2)     A->C->B (minimum overhead to primary site A, maximum delay to DR site C)
3)     A->B; A-C (maximum overhead to primary site A, minimum delay to site B and C)
Are all three configuration possible, which one would you recommend?
Any discussion document or white paper about the above configuration you can point to for me (I gather the scenario may be rare, but multiple physical standby instances set up are not uncommon, if to ignore active data guard part) ?
Edited by: user10786648 on 24/07/2012 17:40
Edited by: user10786648 on 24/07/2012 17:47
Edited by: user10786648 on 24/07/2012 23:36

Hello;
Welcome to the forum.
minimum overhead to primary site A, maximum delay to report site - ( I don't believe in emergency reports, Primary should rule. )
Will refer to these white papers :
Data Guard Redo Transport & Network Best Practices
http://www.oracle.com/technetwork/database/features/availability/maa-wp-10gr2-dataguardnetworkbestpr-134557.pdf
And
Rapid Oracle RAC Standby
http://www.oracle.com/technetwork/database/availability/maa-wp-11g-racone-standby-501088.pdf
And of General interest
Oracle Data Guard with Oracle Database 11g Release 2
http://www.oracle.com/technetwork/database/features/availability/twp-dataguard-11gr2-1-131981.pdf
Oracle Data Guard Technical White Papers
http://www.oracle.com/technetwork/database/features/availability/data-guard-technical-info-152834.html
http://grokbase.com/t/freelists.org/oracle-l/11c18th65t/active-dataguard-ndash-ndash-cascade-standby-or-not
Best Regards
mseberg
Edited by: mseberg on Jul 24, 2012 7:55 PM

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