DB2 9 & 10 for z/OS Overview

Migration Planning WorkshopReal-Time Statistics Evolution• Real Time Statistics (RTS) have been collectedautomatically since V7• DB2 9 moves RTS into the Catalog & externalizes theinformation automatically– DSNDB06.SYSRTSTS• SYSIBM.SYSTABLESPACESTATS• SYSIBM.SYSINDEXSPACESTATS– During ENFM processing, the data is moved from user-defined tablesto the new catalog tables– Drop user-defined tables after ENFM• Gather information about indexes that are used / not used– SYSINDEXSPACESTATS.LASTUSED– "Used", as defined by DB2 is the following:• As an access path for query or fetch.• For searched UPDATE / DELETE SQL statement.• As a primary index for referential integrity.• To support foreign key access.156© 2011 IBM Corporation