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# Unit of Work and Change Policy

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The unit of work tracks changes for a registered object based on the change policy you configure for the object's descriptor. If there are no changes, the unit of work will not start a new transaction.

Table: TopLink Change Policies lists the change policies that TopLink provides.

TopLink Change Policies

Change Policy | Applicable to...
--- | ---
Deferred Change Detection Policy | Wide range of object change characteristics. The default change policy.
Object-Level Change Tracking Policy | Objects with few attributes or with many attributes and many changed attributes.
Attribute Change Tracking Policy | Objects with many attributes and few changed attributes. The most efficient change policy. The default change policy for EJB 3.0 persistent or 2.n CMP on OC4J.

For more information, see "Configuring Change Policy".