DB2 9 & 10 for z/OS Overview

REORG INDEXMigration Planning Workshop• When pending definitions are materialized in REORG INDEX withSHRLEVEL REFERENCE or CHANGE– Index statistics are collected by default and updated in the catalog– Default = STATISTICS UPDATE ALL HISTORY ALL• STATISTICS if used– Will override defaults– New warning message will indicate some partition stats may nolonger be accurate due to materialization of pending changes.– Users should execute RUNSTATS to recollect partition statistics tore-gather COLGROUP, KEYCARD, HISTOGRAM, frequency statswith NUMCOLS>1, and statistics for extended indexes187© 2011 IBM Corporation