There are a number of ways that the HADR standby or standbys can be used beyond their HA or DR purpose.
Reads on standby
The reads on standby feature can be used to direct read-only workload to one or more standby databases without affecting the HA or DR responsibility of the standby. This feature can help reduce the workload on the primary without affecting the main responsibility of the standby.
Only the primary database is accessible unless the reads on standby feature is enabled on one or more of the standbys. Applications connecting to the standby database do not affect the availability of the standby in the case of a failover.
Delayed replay can be used to specify that a standby database is to remain at an earlier point in time than the primary, in terms of log replay. If data is lost or corrupted on the primary, it can be recovered on the time delayed standby.
Rolling updates and upgradesUsing an HADR setup, one can make various types of upgrades and DB2® fix pack updates to your databases without an outage. With multiple standby mode enabled, an upgrade can be performed while maintaining the protection provided by HADR