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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 if the secondary server failsIf you must restart HDR or an RS cluster after a failure of a secondary server, in addition to starting the secondary server, you might need to perform a logical log restore on the secondary server.

Restarting HDR or RS clusters if the secondary server fails

If you must restart HDR or an RS cluster after a failure of a secondary server, in addition to starting the secondary server, you might need to perform a logical log restore on the secondary server.

The steps assume that you have been backing up logical-log files on the primary database server as necessary since the failure of the secondary database server.

Table 1. Steps in restarting after a failure on the secondary database server
Step	On the primary	On the secondary
1.	The primary database server must be in online mode.	oninit If you receive the following message in the message log, continue with step 2: `DR: Start Failure recovery from tape`
2.		command ON-Bar command onbar -r -l

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