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# External Connection Pools

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For J2EE applications, you typically use external connection pools.

If you are using an external transaction controller (JTA), you must use external connection pools to integrate with the JTA (see "Integrating the Unit of Work With an External Transaction Service").

Using external connection pools, you can use either TopLink Workbench or Java to configure the default (write) and read connection pools (see "Default (Write) and Read Connection Pools") and create additional connection pools for object identity (see "Sequence Connection Pools"), or any other purpose (see "Application-Specific Connection Pools").

For more information on selecting the type of connection pool to use, see "Configuring External Connection Pooling".