DB2 9 & 10 for z/OS Overview

Migration Planning WorkshopAccess Currently Committed…• SELECT not blocked by INSERT:– Pre-DB2 10 SELECT waits and eventually a row returned or timesout.– DB2 10 can see row being inserted is not committed, and wouldimmediately skip row.• SELECT not blocked by DELETE:– Pre-DB2 10 SELECT waits and eventually no row is returned ortimes out.– Currently committed row, including any LOB or XML data isreturned, until DELETE is committed.25© 2011 IBM Corporation