The initial task is to ensure that the I/O rates for the DB2® buffer pools and EDM pools are maintained. Gather performance data and compare it with the results taken prior to cutover. The DB2 DSNZPARM parameter CTHREAD limits the total number of DB2-CICS threads. You might have to increase this to handle the additional workload. See the CICS® DB2 Guide for more information about tuning.