MAA - Oracle 10gR2 Redo Transport and Network Best Practices

Maximum Availability Architecture
• Oracle RAC primary database and an Oracle RAC standby database:
http://www.oracle.com/technetwork/database/features/availability/maa-wp-10g-
racprimaryracphysicalsta-131940.pdf
Note: In addition to the above methods, you can use Oracle Enterprise Manager to
create a single-instance standby database from a single-instance or Oracle RAC
primary database.
If you have an existing Data Guard physical standby configuration, you must meet
the following prerequisites before enabling Active Data Guard:
Prerequisites:
1. Obtain a license for the Active Data Guard option
2. Set the COMPATIBLE parameter to at least 11.0.0 in the initialization
parameter file or the SPFILE on both the primary and standby
databases. In addition, the standby must be recovering redo generated
after the COMPATIBLE parameter was set to at least 11.0.0.
BEST PRACTICES FOR ACTIVE DATA GUARD
How to Check if Active Data Guard is Already Enabled
Use the following query to confirm that Data Guard is in active mode:
SQL> SELECT 'Using Active Data Guard' ADG FROM V$MANAGED_STANDBY M,
V$DATABASE D WHERE M.PROCESS LIKE 'MRP%' AND D.OPEN_MODE='READ ONLY';
ADG
-----------------------
Using Active Data Guard
SQL>
If the query does not return the above result, and instead returns: no rows
selected, then Active Data Guard is not enabled, follow the procedures below
to enable Active Data Guard.
A future release of Enterprise Manager Grid Control will make it simple to enable
Active Data Guard and report its status directly from the Data Guard Home Page.
General Best Practices
This section summarizes general best practices for deploying Active Data Guard.
Each topic is discussed in greater detail either in this white paper or in the
documentation referenced.
• Configure and tune Data Guard transport services:
Oracle Active Data Guard: Oracle Data Guard 11g Page 7