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# Locking

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This section describes choices you need to make when deciding on how to use TopLink locking options in your application architecture. Oracle strongly recommends always using a locking policy in a concurrent system (see "Configuring Locking Policy").

These choices can be summarized as follows:

- Optimistic Locking

- Pessimistic Locking

If you are building a three-tier application, be aware of how that architecture affects the way you use locking (see "Locking in a Three-Tier Application").

For more information, see "Understanding Descriptors and Locking".