Front cover The Business Value of DB2 UDB for z/OS Learn about the synergy of DB2 with IBM Eserver zSeries and z/OS Discover how you can benefit from the richness in function Be ready for On Demand Business Paolo Bruni Paul Bartak Rick Butler Sreeni Janaki John Pashley ibm.com/redbooks International Technical Support Organization The Business Value of DB2 UDB for z/OS June 2005 SG24-6763-00 Note: Before using this information and the product it supports, read the information in “Notices” on page ix. First Edition (June 2005) This edition applies to IBM DB2 Universal Database for z/OS Version 8 (program number 5625-DB2). © 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 . ix Trademarks . x Preface . xi The team that wrote this redbook. xii Become a published author . xiv Comments welcome. xiv Chapter 1. Evolution of the mainframe . 1 1.1 The evolution of z/Architecture . 2 1.1.1 Lower cost of entry to mainframes . 2 1.1.2 More options in pricing and performance . 2 1.1.3 Leveraging investment in existing applications . 3 1.2 Hardware. 4 1.3 Operating systems . 10 1.3.1 Value of z/OS . 10 1.3.2 Evolution of z/OS . 16 1.3.3 Other mainframe operating systems . 17 1.4 Processor . 18 1.5 Management . 19 1.6 Preparing new mainframers . 20 1.7 2000 through 2005: The era of on demand. 21 Chapter 2. The evolution of DB2 for z/OS . 23 2.1 The evolution of DB2 UDB for z/OS . 24 2.2 DB2 and Parallel Sysplex industry leadership. 32 2.2.1 Extreme availability . 32 2.2.2 Near-linear scalability . 33 2.2.3 Preservation of investment . 33 2.2.4 Controlled enablement of new functionality on version upgrade. 34 2.2.5 Rolling maintenance and new releases without an outage . 34 2.2.6 Ability to fallback . 35 2.2.7 Conclusion . 35 2.3 Summary for DB2 . 35 Chapter 3. DB2 synergy with zSeries and z/OS . 39 3.1 The zSeries, z/OS, and DB2 partnership . 40 3.1.1 z/OS highlights . 40 3.1.2 zSeries architecture highlights . 42 © Copyright IBM Corp. 2005. All rights reserved. iii 3.1.3 DB2 UDB for z/OS . 42 3.2 Parallel Sysplex and data sharing . 43 3.2.1 Shared nothing . 44 3.2.2 Shared disk . 45 3.2.3 Shared data. 45 3.2.4 Advantages of data sharing . 46 3.2.5 Cost benefit . 47 3.2.6 Summary. 48 3.3 Compression . 48 3.4 Security . 51 3.4.1 zSeries security features. 51 3.4.2 DB2 controls . 52 3.4.3 DB2 and multilevel security. 53 3.4.4 Summary. 57 3.5 Encryption . 57 3.5.1 DB2 column level encryption. 58 3.5.2 IBM Data Encryption for IMS and DB2 Databases . 60 3.5.3 Summary. 60 3.6 Sort . 61 3.7 z/OS Unicode Conversion Services . 62 3.8 UNIX System Services . 62 3.9 WorkLoad Manager, Intelligent Resource Director, and VIPA . 63 3.9.1 WorkLoad Manager. 64 3.9.2 Intelligent Resource Director. 65 3.9.3 Virtual IP addressing . 66 3.9.4 Summary. 67 3.10 Disk storage . 68 3.10.1 ESS . 68 3.10.2 FICON channels . 72 3.10.3 VSAM data striping . 73 3.10.4 Geographically Dispersed Parallel Sysplex . 74 3.10.5 HyperSwap . 75 3.11 zSeries 990 . 75 3.12 64-bit virtual storage . 77 3.13 HyperSockets . 79 3.13.1 Specialized processor for Linux . 79 3.14 zSeries Application Assist Processor for Java . 80 3.15 Summary . 82 Chapter 4. Business resiliency . 85 4.1 The DB2 business computing environment. 86 4.2 DB2 for z/OS and zSeries resiliency . 88 4.2.1 Reliability. 89 iv The Business Value of DB2 UDB for z/OS 4.2.2 Availability . 89 4.2.3 Scalability . 93 4.2.4 Manageability and adaptability . 97 4.2.5 Security . 103 4.2.6 Accessibility and extensibility . 105 4.2.7 Summary. 109 Chapter 5. The on demand environment. ..