Does VSAM file look up within driver program DRIV0000 to selectively call CALL0001 or CALL0002 severly impact performance ?
This is not the kind of question that can be answered easily. There are many, many, many factors that impact VSAM performance and hence could impact the answer: things like how scattered are the records you're reading through the file? is the file in an LSR pool? does the LSR pool have adequate data and index buffers to support your reads? how many reads will you be doing for each of those 10 million transactions? are there other high-usage files in the same LSR pool? does the CICS region have adequate memory for buffers? are there enough threads assigned? etc etc etc