It provides the flexibility to tailor workload definitions after data collection. Business transactions are functionally cohesive processing units that make changes to the database, e.g., posting credit and debit items, creating an order and reservation.
Local buffers exist at each application server to minimize database accesses.
It also collects detailed data about OS, database, network and buffer statistics. The model can predict how configuration and workload changes affect system performance. Real measurements of performance data also are required inputs to the model. A workload consists of a set of transactions performed by a set of users. A transaction should be thought of as a unit of work that results in processing with resource consumption and has a response time or completion time.