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AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL OneDB™ database servers.
Administrator's GuideThe HCL OneDB™ Administrator's Guide provides the information required to administer HCL OneDB™.
High availability and scalabilityA successful production environment requires database systems that are always available, with minimal if any planned outages, and that can be scaled quickly and easily as business requirements change.
Cluster failover, redirection, and restorationTo maintain availability, you must plan for the failover of primary servers, redirecting client connections from unavailable servers, and restoring the cluster to its original configuration after a failure.
Recover HDR and RS clusters after failureWhen you restore the HDR or RS cluster back to the original configuration, you might need to restore critical media, as well as restart and configure servers in the cluster.
Restarting HDR or RS clusters after a network failureAfter a network failure, the HDR or RS cluster might need to be restarted. After a network failure, the primary database server is in online mode, and the secondary database server is in read-only mode. Replication is turned off on both database servers (state = off).

Restarting HDR or RS clusters after a network failure

After a network failure, the HDR or RS cluster might need to be restarted. After a network failure, the primary database server is in online mode, and the secondary database server is in read-only mode. Replication is turned off on both database servers (state = off).

Restarting the cluster might not be necessary because the primary database server attempts to reconnect every 10 seconds and displays a message regarding the inability to connect every 2 minutes.

If the cluster does not restart automatically, when the connection is reestablished, you can restart the cluster by running the following commands on the secondary server:

onmode -d secondary primary_name

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