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Oracle Tips by Burleson |
Oracle Dataguard
Chapter 9 - Recovery Manager and Data
Guard
What needs to be Backed
Up for a RAC Grid Creation?
The first step in creating a standby database,
using any method, is to identify a suitable backup to use. To use
RMAN for RAC Grid creation, there should always be a backup
containing the following components:
The control file, data files and archived redo
log files can be backed up as a backup set or image copies. The
backup of the server parameter file does not have to be using RMAN.
This file can simply be copied to another file using the operating
system utility and then the necessary changes made.
The changes required in the server parameter
file are similar to the ones presented in Chapter 3. To create a
standby database, any of the following can be used: a backup set
containing all the required files; a set of image copies of the
required files; or a heterogeneous set containing some files as the
backup set and some as image copies.
In a scenario where the primary and the standby
database are residing on the same host, a backup of the archived
redo log files is not required. This is due to the fact that the
control file or recovery catalog of the primary database will have
information about the archived redo log files location. Therefore,
during the recovery operation of the DUPLICATE command, RMAN can
make use of this information. In this case, during the initial
recovery, RMAN will read and apply archived redo log files from the
local archival destination of the primary database onto the standby
database.
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