90 Understanding the Cache

The TopLink cache is an in-memory repository that stores recently read or written objects based on class and primary key values. TopLink 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

This section describes the following:

• Cache Architecture

• Cache Concepts

• Understanding the Cache API