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# Understanding Descriptors and Locking

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This section describes the various types of locking policy that TopLink supports, including the following:

- Optimistic Version Locking Policies

- Optimistic Version Locking Policies and Cascading

- Optimistic Field Locking Policies

- Pessimistic Locking Policy

- Locking in a Three-Tier Application

For more information, see "Configuring Locking Policy".