Use the Define Transaction dialog box to define a transaction. You can define a transaction to be a certain number of I/Os or an amount of CPU used.
After you define a transaction, this definition is used instead of the transaction definition found in the .MERG or .merg file. For example, if the measured data produces 100 I/Os and 253 transactions, but you have defined a transaction to be 5 I/Os, then the new number of transactions is 20.