Learning about message stores

Message stores play an essential part in the operation of messaging engines. Each messaging engine has one and only one message store, which can be either a file store or a data store.

A message store enables a messaging engine to preserve operating information and to retain those objects that messaging engines need for recovery in the event of a failure.

A messaging engine preserves both volatile and durable data in its message store. Volatile data is lost when a messaging engine stops, in either a controlled or an uncontrolled manner. Durable data is available after the server restarts. For more information, refer to Message reliability levels. A messaging engine stores various types of data, including messages, transaction states, and communication channel states.

When started, a messaging engine obtains configuration information from the WebSphere® Common Configuration Model (WCCM) repository. A messaging engine retrieves all other data from its own file store or data store.

Important: There are currently no facilities available for migrating from a data store to a file store.



Subtopics
Learning about data stores
Learning about file stores
Considerations when choosing between a file store and a data store
Message store high availability considerations
Related tasks
Message stores
Concept topic    

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Last updated: Feb 19, 2011 5:25:36 AM CST
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