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Function documentation RAC with BRBACKUP  Locate the document in its SAP Library structure

Use

This section describes how to set up the Oracle Real Application Cluster (RAC) to run with BRBACKUP.

Prerequisites

You must set the parallel_instances parameter in the init<DBSID>.sap profile used by BRBACKUP so that BRBACKUP can access all the Oracle instances.

Features

BRBACKUP functionality is available for RAC databases, including the support of software and hardware compression. However, there is no continuation mechanism with the dd command. For more information, see Raw Devices with BRBACKUP and BRRESTORE.

Activities

Database backup with BRBACKUP for RAC runs as follows:

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       1.      If the local Oracle instance is stopped, BRBACKUP starts it with the appropriate SQLPLUS commands.

       2.      BRBACKUP logs on to the local dedicated database (DDB) instance and performs the common actions in the database (determination of the database structure, the volumes used, and so on).

       3.      For an offline backup, database instances are stopped. For online backup, the instances continue running during the backup.

       4.      The required backup is started.

       5.      For an offline backup, database instances are restarted in parallel at the end of the backup.

       6.      BRBACKUP updates the SDBAH and SDBAD tables.

       7.      The status of all instances before the start of the backup with BRBACKUP is recovered. That is, the instances that were stopped before the backup are now stopped again.

During the entire backup, BRCONNECT monitors all database instances and checks them constantly to see that the required status of each instance remains unchanged. If the status of an instance changes during the backup, BRCONNECT interrupts the entire backup.

In the BRBACKUP log, both before and after the actual backup, a log is made of the parameters relevant to archiving for all database instances in question. The log consists of output of the ARCHIVE LOG LISTcommand.

If you run an offline backup of the entire database, a copy of all online redo log groups for the Oracle instances is saved in each case.

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