Abstract: A network device and method for learning and monitoring transactions executed by back-end systems in data servers. Specifically, it allows learning and monitoring at least standard query language (SQL) transactions sent from an application server hosting a web application to a database server and executed thereon. Monitoring of SQL transactions allows measuring performance parameters with regards to databases, databases' tables, operations and queries that are part of the transactions. Furthermore, the measurement of performance parameters with respect to HTTP requests of the respective SQL transactions is provided.