Performing cross-regional disaster recovery for an Exadata Database on Oracle Database@Azure involves several steps. This ensures that your databases can be quickly and efficiently recovered in the event of a regional failure. Below is a step-by-step guide to set up and perform cross-regional disaster recovery:
Step-by-Step Guide
1. Pre-Requisites and Setup
Oracle Exadata Infrastructure: Ensure you have Exadata infrastructure set up in both the primary and secondary regions.
Oracle Database Configuration: The databases should be running on Oracle Database 12c or later.
Network Configuration: Secure and configure the network connectivity between the two regions.
2. Configure Data Guard on Exadata
Data Guard is Oracle's disaster recovery solution, which allows you to set up, manage, and monitor one or more standby databases to protect data from failures, disasters, errors, and corruptions.
Primary Region Configuration:
Enable Force Logging: ALTER DATABASE FORCE LOGGING;
Configure Archivelog Mode: SHUTDOWN IMMEDIATE; STARTUP MOUNT; ALTER DATABASE ARCHIVELOG; ALTER DATABASE OPEN;
Set Initialization Parameters: Add the following parameters to the init.ora or spfile: LOG_ARCHIVE_DEST_1='LOCATION=USE_DB_RECOVERY_FILE_DEST' LOG_ARCHIVE_DEST_2='SERVICE=standby_db' LOG_ARCHIVE_DEST_STATE_2=ENABLE LOG_ARCHIVE_FORMAT='%t_%s_%r.dbf'
Standby Region Configuration:
Prepare the Standby Database: RMAN> DUPLICATE TARGET DATABASE FOR STANDBY FROM ACTIVE DATABASE DORECOVER;
Set Initialization Parameters on Standby: LOG_ARCHIVE_DEST_1='LOCATION=USE_DB_RECOVERY_FILE_DEST' LOG_ARCHIVE_DEST_2='SERVICE=primary_db' LOG_ARCHIVE_DEST_STATE_2=ENABLE LOG_ARCHIVE_FORMAT='%t_%s_%r.dbf'
Start Redo Apply: ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;
3. Configure Oracle Data Guard Broker
Oracle Data Guard Broker simplifies the management of a Data Guard configuration by providing a centralized interface.
Enable the Broker on Both Databases: ALTER SYSTEM SET DG_BROKER_START=TRUE;
Create a Configuration: DGMGRL> CREATE CONFIGURATION 'DRConfig' AS PRIMARY DATABASE IS 'primary_db' CONNECT IDENTIFIER IS 'primary';
Add Standby Database: DGMGRL> ADD DATABASE 'standby_db' AS CONNECT IDENTIFIER IS 'standby';
Enable the Configuration: sql Copy code DGMGRL> ENABLE CONFIGURATION;
4. Test the Disaster Recovery Setup
Switchover to Standby: s DGMGRL> SWITCHOVER TO 'standby_db';
Failover to Standby (if the primary is unavailable): DGMGRL> FAILOVER TO 'standby_db';
Reinstate the Former Primary as Standby (if possible): DGMGRL> REINSTATE DATABASE 'primary_db';
5. Monitor and Manage the Setup
Regular Backups: Ensure that regular backups are taken and validated.
Monitoring: Use Oracle Enterprise Manager or other monitoring tools to keep track of the health and performance of both primary and standby databases.
Testing: Regularly test the switchover and failover processes to ensure the disaster recovery plan works as expected.
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