Deferred Create for container managed persistence

The specification for EJB 2.x states that for Container Managed Persistence (CMP) during the ejbCreate, the container can create the representation of the entity in the database immediately, or defer it to a later time.

The WAS versions 5.0.2 and later enable you to take advantage of this specification. We can turn this option on from the EJB CMP side. When you choose this option, the runtime defers ejbCreate (or the equivalent database persistence request) until it is needed. This can be at the end of the transaction, or when a flush is needed for finders related to this EJB type. By doing this one can reduce two round trips for the newly created entity (insert and update) to one (insert).

The WAS v6.0 enables you to make the same settings using the Application Server Toolkit (AST).

 

See also

Setting the run time for deferred create with JVM arguments
Setting the run time for deferred commands with the assembly tools

 

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