DB2 9 & 10 for z/OS Overview

Migration Planning Workshop• ALTER is IMMEDIATE to enforceuniqueness– Table in advisory reorg state– Overflow index in rebuild pendingstate• Inserts not allowed• Can delete/update (if not on key)– Rebuild Index (optional to allowinserts)• Builds a large index (contains entry for all rows)• Allows inserts after rebuild• Index will be very large– Reorg table spaceALTER TABLE ADD ORGANIZE BY HASH• AUTOESTSPACE(YES) uses RTS• Part level REORG is not allowed• Changes the organization to hash• Index shrinksFixed Hash AreaNon-Hash Table SpacePart 1 Part 2 Part 3 Part 4 Part 5HashOverflowIndexPart 1 Part 2 Part 3 Part 4 Part 5REORGALTER ADD HASHIndex created, put inRebuild pendingHashOverflowIndexPart 1 Part 2 Part 3 Part 4 Part 5 Part 6 Part 7124© 2011 IBM Corporation