By IBM Redbooks
This Redbook discusses the built-in atmosphere of DB2 UDB and WebSphere software Server (WAS), together with layout concerns, top practices, operation, tracking, and function tuning.
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Additional resources for DB2 UDB V8 and WebSphere V5: Performance Tuning and Operations Guide
4), (5) The first available I/O server reads the prefetch request from the queue and then reads the data from the table space into the buffer pool. The number of I/O servers that can fetch data from a table space at the same time depends on the number of prefetch requests in the queue and the number of I/O servers configured by the NUM_IOSERVERS database configuration parameter. • (6) The database agent performs the necessary operations on the data pages in the buffer pool and returns the result to the user application.
1 Process model DB2 UDB starts various processes to deal with the database tasks. In Figure 3-3 you can find an illustration of the process model DB2 UDB uses. Figure 3-3: DB2 process model A single coordinator agent (db2agent) is assigned to a client application when it connects to a database. A coordinator agent works on behalf of an application, and communicates to other agents, using inter-process communication (IPC) or remote communication protocols. Subagents (db2agntp) support the coordinator agents if they are a partitioned database environment or intra-partition parallelism is activated.
2 is an integral component of an on demand operating environment. 36 Chapter 2: Overview of Websphere Application Server V5 Chapter 2: Overview of Websphere Application Server V5 37 Unleash Interoperable and Secure Web Services IBM provides third-generation support for all of the Web services standards needed for describing and deploying applications or services on a network in a consistent way so that they can be discovered and invoked in a more secure and reliable manner. 0. 2 will get a head start on inter-operating across heterogeneous environments and enterprise boundaries.