Articles & Content


How will this index reduce I/O? (A11)

Topic: DB2 for z/OS

Subtopic: 2006

DATE: 2006-10-4 (14:45 - 15:45)
SPEAKERS: Terry Purcell (IBM Silicon Valley Lab)

There are numerous myths about when indexes are beneficial for performance, and how the columns should be ordered. This presentation will demonstrate how clustering and indexing complement each other reduce data I/O, when index-only access can be beneficial, and index design to encourage table join sequence and method.

EXP. LEVEL: Intermediate,Advanced


Goal of Indexing

Clustering and clusterratio

Index-only access

Column ordering

Encouraging join sequence and method

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