Persistence Properties in Oracle SOA Suite

Persistence Properties in Oracle SOA Suite:

Oracle BPEL Persistence properties are used to control, when and how a process need to be dehydrated.

inMemoryOptimization

This property indicates to Oracle BPEL Server that this process is a transient process and dehydration of the instance is not required. When set to true, Oracle BPEL Server keeps the instances of this process in memory only during the course of execution. This property can only be set to true for transient processes (process type does not incur any intermediate dehydration points during execution).

• false (default): instances are persisted completely and recorded in the dehydration store database for a synchronous BPEL process.

• true: Oracle BPEL Process Manager keeps instances in memory only.

completionPersistPolicy

This property controls if and when to persist instances. If an instance is not saved, it does not appear in Oracle BPEL Console. This property is applicable to transient BPEL processes (process type does not incur any intermediate dehydration points during execution).

This property is only used when inMemoryOptimization is set to true.

This parameter strongly impacts the amount of data stored in the database (in particular, the cube_instance, cube_scope, and work_item tables). It can also impact throughput.

• on (default): The completed instance is saved normally.

• deferred: The completed instance is saved, but with a different thread and in another transaction, If a server fails, some instances may not be saved.

• faulted: Only the faulted instances are saved.

• off: No instances of this process are saved.

<component name="mySampleBPELComponent">
...
<property name="bpel.config.completionPersistPolicy">faulted</property>
<property name="bpel.config.inMemoryOptimization">true</property>
...
</component>

oneWayDeliveryPolicy

The oneWayDeliveryPolicy is from the Oracle 10g configuration property deliveryPersistencePolicy.The new configuration property name is bpel.config.oneWayDeliveryPolicy.

This property controls database persistence of messages entering Oracle BPEL Server. Its used when we need to have a sync-type call based on a one way operation. This is mainly used when we need to make an adapter synchronous to the BPEL Process.

By default, incoming requests are saved in the following delivery service database tables: dlv_message

• async.persist: Messages are persisted in the database.

• sync.cache: Messages are stored in memory.

• sync: Direct invocation occurs on the same thread.

<component name="mySampleBPELProcess">
...
<property name="bpel.config.transaction" >required</property>
<property name="bpel.config.oneWayDeliveryPolicy">sync</property>
...
</component>