By changing the isolationlevel, the J2EE developer or deployer can balance data integrity against performance constraints to performance tune the application.
This section shows how to set the resource sharing scope, how to set the IBM isolationlevel extension, and how to associate access intents with BMP and CMP EJBs.
If the query is executed at a higher isolationlevel than the isolationlevel at which the MQT is created, that MQT will not be considered for execution of the query.