What are Concurrency Types?

Pramati Server features different concurrency modes enabling pessimistic and optimistic concurrency at the application server level and deferring of locking services to the corresponding database.

When writing business methods for entity beans, the bean provider need not worry about concurrent access from multiple transactions. The bean provider can assume that the container ensures appropriate synchronization for entity objects that are accessed concurrently from multiple transactions.

Concurrent transactions use locks to synchronize access to entity beans. These locks are either maintained by the application server or pushed to the underlying persistent store. The concurrency modes supported in Server are:

• Repeatable Read
• Optimistic Repeatable Read - set this to verify all, modified, or modified and accessed fields
• Read Committed
• Read Only

Click here to know how to setup Concurrency Control for CMP Beans.

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