This disclosure relates to methods for monitoring a database system without access to the database system, wherein when data packets between a plurality of operating servers including the database system and a plurality of client application processes are sent and/or received through a SQL net protocol or BEQ protocol, the data packets are collected through sniffing by a monitoring process or through a separate pipe gateway process thereby SQL information and database performance information transmitted between the operating servers and the client application processes are extracted. The SQL information and database performance information can be effectively monitored with no load or minimized load to the database, operating server and network.