Central Ohio Db2 Users Group – December 2017

CODUG – Central Ohio Db2 Users Group – December 2017

December 05th, 2017

SEGUS & SOFTWARE ENGINEERING present

Db2 z/OS Lies, Damn Lies, and Statistics

..Lies, damn lies, and statistics… – Benjamin Disraeli, Prime Minister of England (1868, 1874-1880)

The above line may, or may not, have been spoken well over 100 years ago, but the need for statistics and, above all else, accurate statistics is more important than ever in the Db2 world of today.

Presentation Outline

• Db2 RUNSTATS basics & catalog tables and Columns used for access path
• IBM recommendations through the ages : from Db2 V3 to Db2 12
• Db2 RUNSTATS advanced
• SYSCOLDIST explained
• RUNSTATS real world Q&A :
  use of SAMPLE, COLGROUP, PROFILE, REOPT (ONCE), TABLESAMPLE SYSTEM, HISTOGRAM, …
• RUNSTATS reversal

Speaker Biography

Ulf Heinrich is the Director of Solutions Delivery at SOFTWARE ENGINEERING GmbH. He specializes in Db2 recovery issues and database maintenance, focusing on the growing requirement for cost reduction and 24×7 operations. As a consultant at large customer sites, he has implemented database maintenance procedures and recovery strategies, and also experienced the pitfalls of recovery scenarios under real‐world recovery pressure. His activities cover EMEA, as well as North America through SE’ U.S. subsidiary, SEGUS Inc. He’s involved in the development of SE’ maintenance and recovery Solutions.