1. Cache Guide
  2. Using Cache in an Oracle RAC Environment
  3. Restrictions on Using Cache in an Oracle RAC Environment

Restrictions on Using Cache in an Oracle RAC Environment

There are some restrictions for cache support of Oracle RAC.

The restrictions for cache support of Oracle RAC are:

  • Cache operations are limited to Oracle RAC, FAN and TAF capabilities. For example, if all nodes for a service fail, the service is not restarted. TimesTen waits for the user to restart the service.

  • TAF does not recover ALTER SESSION operations. The user is responsible for restoring changed session attributes after a failover.

  • For cache operations, TimesTen uses OCI integrated with FAN. This interface automatically spawns a thread to wait for an Oracle Database event. This is the only TimesTen feature that spawns a thread in a TimesTen application with the direct driver. Adapt your application to account for this thread creation. If you do not want the extra thread, set the RACCallback connection attribute to 0 so that TAF and FAN are not used.