DB2 9 & 10 for z/OS Overview

Migration Planning WorkshopMulti-Versioning (MV) Support...• Requires the base table to be a Universal Tablespace (UTS)• MV format required for several V10 features:– XMLMODIFY– Temporal data (“AS OF”)– Currently Committed– SELECT FROM OLD TABLE (V9 feature)• The MV format reduces locking– XML data is not kept with base row data in the work files– MV eliminates the need for a lock to be maintained on the XML rowuntil it is processed, except for UR Readers (DOCID lock). Avoids aUR Reader from getting an incomplete document.55© 2011 IBM Corporation