Front cover Database Strategies: Using Informix XPS and DB2 Universal Database Understanding and exploiting the strengths of Informix XPS and DB2 UDB Considerations for transitioning data and schemas to DB2 UDB Working with very large data volumes Chuck Ballard Weiren Ding Carlton Doe Glen Mules Rajamani Muralidharan Santosh Sajip Nora Sokolof Andreas Weininger ibm.com/redbooks International Technical Support Organization Database Strategies: Using Informix XPS and DB2 Universal Database August 2005 SG24-6437-00 Note: Before using this information and the product it supports, read the information in “Notices” on page xiii. First Edition (August 2005) This edition applies to Version 8.2 of DB2 Universal Database (UDB) and Version 8.5 of Informix Extended Parallel Server (XPS). © Copyright International Business Machines Corporation 2005. All rights reserved. Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Notices . xiii Trademarks . xiv Preface . xv The team that wrote this redbook. xvi Become a published author . xix Comments welcome. xix Chapter 1. Introduction to this redbook . 1 1.1 Understanding strategic directions for XPS. 2 1.2 Objective of this redbook. 3 1.3 Chapter abstracts . 4 Chapter 2. XPS and DB2 UDB architectures . 7 2.1 High-level product overviews . 9 2.1.1 IBM Informix Extended Parallel Server . 9 2.1.2 DB2 Data Warehouse Edition . 11 2.2 Understanding the architectures . 20 2.3 Defining an instance . 21 2.3.1 Informix XPS instance architecture . 23 2.3.2 DB2 Universal Database instance architecture. 25 2.4 Storage architecture . 29 2.4.1 Pages . 31 2.4.2 Containers and chunks . 31 2.4.3 Logical disks . 35 2.4.4 Logging . 37 2.4.5 Storage architecture summary . 41 2.5 Parallelism. 42 2.5.1 The process model of XPS . 42 2.5.2 The process model of DB2 . 44 2.5.3 Intra-node parallelism . 47 2.5.4 Inter-node parallelism . 47 2.6 Memory management . 48 2.6.1 XPS memory model . 48 2.6.2 DB2 memory model . 51 2.7 Partitioning . 54 2.7.1 Fragmentation in XPS . 54 2.7.2 Partitioning in DB2 . 58 2.8 Terminology. 60 © Copyright IBM Corp. 2005. All rights reserved. iii Chapter 3. Configuration . 63 3.1 XPS and DB2 configuration. 64 3.1.1 Knobs (configuration files and tuning parameters) . 64 3.1.2 Commands . 64 3.1.3 Granularity. 64 3.1.4 Database manager . 65 3.1.5 Dynamic parameters . 65 3.1.6 Cataloging . 66 3.1.7 Client access to DB2 instances. 66 3.2 Configuration methods . 66 3.2.1 DB2 configuration methods. 67 3.2.2 Configuration Advisor and the AUTOCONFIGURE command . 69 3.3 Configuration files and objects overview . 72 3.3.1 Environment variables and the profile registry . 72 3.3.2 Setting registry and environment variables . 73 3.3.3 DB2 configuration files and objects. 74 3.4 Configuring the instance . 79 3.4.1 Page size(s) . 79 3.4.2 Table spaces. 80 3.4.3 Bufferpools . 81 3.4.4 Physical and Logical Logs. 82 Chapter 4. Instance and database operations . 87 4.1 Instance operation modes . 88 4.1.1 Online mode . 88 4.1.2 Offline mode . 90 4.1.3 Quiescent mode . 90 4.1.4 Creating and dropping the instance . 91 4.2 Modifying the configuration . 91 4.2.1 Working with the DAS . 92 4.2.2 Viewing or updating the configuration using Control Center . 93 4.2.3 Managing database partition groups. 96 4.2.4 Managing buffer pools. 99 4.3 Managing database storage . 100 4.3.1 Table spaces and containers . 100 4.3.2 Monitoring table space and container storage . 103 4.3.3 Transactions and logs . 108 4.4 Backup and recovery. 112 4.4.1 Recovery types . 112 4.4.2 Backup and restore methods . 114 4.4.3 Table level restore. 121 4.5 High availability . 122 4.5.1 Log mirroring . 122 iv Database Strategies: Using Informix XPS and DB2 Universal Database 4.5.2 Replication . 123 4.5.3 Online split mirror and suspended I/O support . 123 4.6 Security . 124 4.6.1 Authorization and privileges . 125 4.6.2 Roles and groups . 128 4.6.3 Security levels . 129 4.6.4 Client/server security. 139 4.6.5 Authentication methods. ..