DB2 9 & 10 for z/OS Overview

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Migration Planning WorkshopAccess Currently Committed…• Consider as second generation lock avoidance.– DB2 may revert to unconditional locking.– Alternative to DB2 9 “SKIP LOCKED DATA” option, whichignores row.– Alternative to ISOLATION(UR)• QMF global variable DSQEC_CON_ACC_RES can beused to support feature.28© 2011 IBM Corporation
Migration Planning WorkshopExtended Indicator Variables• Pre-DB2 10 Problem/Requirements:– No way to tell DB2 what value to use in an INSERT, UPDATE orMERGE when values for all the columns are not specified.– Need to define all possible SQL combinations… very tedious– Very low use of dynamic statement cache.• DB2 10 Solution:– DB2 10 NFM introduces extended indicator variables to specifywhat value should be used for columns when a value is notprovided in an INSERT, UPDATE or MERGE.• New values used for existing indicator variables.– Simplifies application development… no need to define all possibleSQL combinations– Improves overall performance29© 2011 IBM Corporation
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DB2 9 & 10 for z/OS Overview

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