DB2 9 & 10 for z/OS Overview

Migration Planning WorkshopLOB Locking Changes• Elimination of LOB locks– Now using LRSN & page latching for consistency checks– Prior to DB2 9, LOB locks were held until commit• Even for UR• Space search for LOB allocation– No LOB locks acquired for space search– Read granularity improved to page level in LOB table space• Improved availability & performance– Particularly for UR readers• Requirements:– NFM– “Locking protocol 3” GBP changes• Automatic in non-data sharing• Clean group-wide quiesce in data sharing once NFM enabled– No quiesce is needed with PK6202793© 2011 IBM Corporation