Sharing persistent stores

The question arises. In WebLogic Server, should you share persistent stores across your JMS modules?

Let's say that you have 2 separate JMS modules, each hosting a slew of queues and topics:

• IPNWebErrorModule (contains JMS queues used exclusively by our error handling code)
• IPNWebERPModule   (contains JMS queues and topics specific to our ERP code)

The short answer is found in the Best Practices When Using Persistent Stores in the Oracle documentation:

For subsystems that share the same server instance, share one store between multiple subsystems rather than using a store per subsystem. Sharing a store is more efficient for the following reasons:

• A single store batches concurrent requests into single I/Os which reduces overall disk usage.
• Transactions in which only one resource participates are lightweight one-phase transactions. Conversely, transactions in which multiple stores participate become heavier weight two-phase transactions.

Applicable Versions

• Oracle WebLogic Server 11g

References

• http://docs.oracle.com/cd/E17904_01/web.1111/e13814/storetune.htm