DB2 UDB V8 and WebSphere V5: Performance Tuning and by IBM Redbooks

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This Redbook discusses the built-in atmosphere of DB2 UDB and WebSphere program Server (WAS), together with layout concerns, top practices, operation, tracking, and function tuning.

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DB2 UDB V8 and WebSphere V5: Performance Tuning and Operations Guide

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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Other concurrent applications can read the table. Rows, Tables The lock owner can update data in the locked row or table. The lock owner acquires X locks on the rows before it updates the rows. Other units of work can read the data in the locked row or table, but cannot attempt to update it. Rows The lock owner can read but not update the locked row. This mode is similar to an X lock except that it is compatible with the NS lock. Rows This lock is acquired on the next row when a row is inserted into the index of a non-catalog table.

DB2 UDB is specially designed and priced to meet your business needs whether large or small. 1 DB2 Everyplace® This database engine is designed to store and process data on mobile and embedded devices. It is a full relational database with a small footprint and a synchronization server. 2 DB2 Express This is the newest member of the DB2 UDB product family. The key features include simplified deployment, autonomic management capabilities, application development support and design for 7x24 operation.

A listener process is between the client and the server processes. This process is responsible for the communication between the client and the server. There are different listener processes to handle different communication protocols. There can be up to four listeners available in an AIX environment: • db2ipccm: For local client connections • db2tcpcm: For TCP/IP connections • db2snacm: For APPC connections • db2tcpdm: For TCP/IP discovery tool requests On the instance level there are several processes and threads like the system controller (db2sysc) that must exist in order for the database server to function.

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