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Configuring SAP HANA System Replication between a primary and secondary site involves several steps. Here is an overview of the process:
- Ensure that you have a fully installed and configured SAP HANA system on both the primary and secondary sites.
- Make sure the network connectivity is established between the primary and secondary sites, including the necessary ports for HANA communication.
- Enable System Replication:
- On the primary site, open the SAP HANA Cockpit or SAP HANA Studio.
- Connect to the primary HANA instance as a user with administrative privileges.
- Navigate to the “System Replication” section and enable the system replication feature.
- Configure the Primary Site:
- Set the replication mode to “sync” or “async” based on your requirements.
- Define the secondary site and specify the connection details (IP address, port, etc.) of the secondary HANA instance.
- Configure the replication parameters like the replication mode, log retention, etc.
- Save the configuration and start the replication process on the primary site.
- Prepare the Secondary Site:
- Install and configure a new SAP HANA system on the secondary site if it’s not already done.
- Ensure that the secondary site has the same hardware resources and HANA version as the primary site.
- Configure the network settings and ensure that the secondary site can communicate with the primary site.
- Establish the Initial Data Copy:
- Initiate the initial data replication from the primary site to the secondary site.
- This process involves copying the data from the primary database to the secondary database to synchronize them.
- Monitor the data copy process and ensure it completes successfully.
- Test the Replication:
- Once the initial data copy is complete, verify that the data is consistent between the primary and secondary sites.
- Perform tests and checks to ensure that the replication is working as expected.
- Validate that the secondary site is in a synchronized state with the primary site.
- Monitor and Maintain:
- Set up monitoring tools to track the replication status and performance.
- Regularly monitor the replication processes, log files, and system alerts.
- Perform periodic checks to ensure the replication is functioning correctly.
To configure HANA system replication between a primary and secondary site, you’ll need to perform several steps. Here’s an overview of the commands involved in the configuration process:
- Connect to the primary site’s HANA database using the HANA Studio or HANA Cockpit, or by using the
hdbsqlcommand line tool.
- Check the current replication status and configuration:
ALTER SYSTEM GET CONFIGURATION ('systemReplication')
This command will show you the current replication status and settings.
- If replication is not yet enabled, you’ll need to enable it. Use the following command:
ALTER SYSTEM SET CONFIGURATION ('systemReplication', 'enabled', 'true') WITH RECONFIGURE
This command enables system replication and triggers a reconfiguration.
- Create the secondary site configuration. Connect to the secondary site’s HANA database and execute the following command:
CREATE SYSTEM REPLICATION CONFIGURATION '<configuration_name>' SITE 'secondary_site' HOST '<secondary_host>' PORT <secondary_port> USER '<replication_user>' PASSWORD '<replication_password>'
<replication_password>with the appropriate values.
- Configure the replication mode and other parameters. Execute the following command at the primary site:
ALTER SYSTEM ALTER CONFIGURATION ('systemReplication') SET ('mode', '<sync_mode>') WHERE TARGET = 'secondary_site'Replace
<sync_mode>with the desired synchronization mode. Common options are 'sync', 'async', or 'near_sync'.
- Start the replication process:
ALTER SYSTEM START REPLICA ADMIN FOR CONFIGURATION '<configuration_name>'Replace
<configuration_name>with the name specified in step 4.
- Validate the replication setup. Check the replication status using:
SELECT * FROM M_SYSTEM_REPLICATION_STATUSThis command will show you the current replication status.