Revision as of 14:33, 18 February 2011

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Examples

• Caching

Caching Overview

The EclipseLink cache is an in-memory repository that stores recently read or written objects based on class and primary key values. EclipseLink uses the cache to do the following:

• Improve performance by holding recently read or written objects and accessing them in-memory to minimize database access.
• Manage locking and isolation level.
• Manage object identity.

For more information about the EclipseLink cache and its default behavior, see Introduction to Cache.

EclipseLink defines the following entity caching annotations:

• @Cache
• @TimeOfDay
• @ExistenceChecking

EclipseLink also provides a number of persistence unit properties that you can specify to configure the EclipseLink cache (see How to Use the Persistence Unit Properties for Caching). These properties may compliment or provide an alternative to the usage of annotations.

For more information, see the following:

• What You May Need to Know About Overriding Annotations in JPA
• What You May Need to Know About Using EclipseLink JPA Persistence Unit Properties

Caching	Caching	@Cache Annotation
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