5. Setting the Transaction Isolation
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## 5. Setting the Transaction Isolation

OpenJPA typically retains the default transaction isolation level of the JDBC driver. However, you can specify a transaction isolation level to use through the `openjpa.jdbc.TransactionIsolation` configuration property. The following is a list of standard isolation levels. Note that not all databases support all isolation levels.

- `default`: Use the JDBC driver's default isolation level. OpenJPA uses this option if you do not explicitly specify any other.

- `none`: No transaction isolation.

- `read-committed`: Dirty reads are prevented; non-repeatable reads and phantom reads can occur.

- `read-uncommitted`: Dirty reads, non-repeatable reads and phantom reads can occur.

- `repeatable-read`: Dirty reads and non-repeatable reads are prevented; phantom reads can occur.

- `serializable`: Dirty reads, non-repeatable reads, and phantom reads are prevented.

Example 4.8. Specifying a Transaction Isolation

    <property name="openjpa.jdbc.TransactionIsolation" value="repeatable-read"/>

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