12 Chapter 12. Message store problem determination The message store holds the state of your WebSphere Application Server default messaging system, both persistently on a storage device and in memory at runtime. During configuration of the WebSphere Application Server, you can choose between these two configuration options for storing persistent message data: File store. Introduced in WebSphere V6.1, this mechanism uses flat files on a local or remote file system to store all persistent data. Data store. This method lets you use an existing relational database management system (RDBMS), such as IBM DB2, to store all persistent data. Problems might occur when a messaging engine attempts to access its persistent message store. The first step in any message store problem investigation is to identify the type of message store persistence in use. © Copyright IBM Corp. 2007. All rights reserved. 365