If you use a statistics file, you can collect the statistics of each function of a J2EE server, batch server, and SFO server. The information related to server performance and server resources is output to a statistics file as the statistics. The following table describes functions of J2EE servers, batch servers, and SFO servers that come within the scope of a statistics file and types of the statistics that you can acquire with each function:

Table 3-4 Types of the statistics that you can acquire with each function

Functionality	Description of functionality	Type of the statistics
JavaVM	JavaVM that uses a J2EE server or SFO server	JavaVM heap size Frequency of copy garbage collection Frequency of full garbage collection Number of classes loaded Number of operational threads Number of threads blocked due to monitor lock Explicit heap size Number of Explicit memory blocks in the Explicit heap area Maximum size of Explicit memory block Maximum size of Explicit memory block acquired in an HTTP session Number of Explicit memory blocks acquired in an HTTP session Explicit heap size managed by containers excluding the Explicit heap area acquired in an HTTP session Explicit heap size managed by user applications and JavaVM
Process resource	Process resources that are used by a J2EE server and SFO server	Number of threads Number of file descriptors
Stateful Session Bean	Stateful Session Bean running on a J2EE server	Number of connection sessions
Stateless Session Bean	Stateless Session Bean running on a J2EE server	Number of pooled instances Number of used instances in the pool Number of pending requests
Message-driven Bean	Message-driven Bean running on a J2EE server	Number of pooled instances Number of used instances in the pool Number of messages received
DB Connector	DB Connector running on a J2EE server	Number of pooled PreparedStatement Number of pooled CallableStatement Frequency of invoking the PrepareStatement method Frequency of invoking the PrepareCall method Hit frequency of PreparedStatement in the pool Hit frequency of CallableStatement in the pool
JCA resource	JCA resources that are used by resource adapters	Number of pooled connections Number of used connections in the pool Number of threads waiting for connection Number of connection failures
Transaction service	Transaction services used by a J2EE server	Number of transactions resolved Number of transaction rollbacks
Web Application	Web applications running on a J2EE server	Number of synchronous threads Number of pending requests for Web applications Number of entire pending requests for Web applications Number of requests exceeding the upper limit of the number of requests pending for Web applications Number of received requests Number of responded requests Number of sessions
Web container	Web containers running on a J2EE server	Number of synchronous threads Number of pending requests for Web containers or number of default pending requests Number of entire pending requests for Web containers Number of requests exceeding the upper limit of the number of requests pending for Web containers
URL group	Control of number of concurrently executing threads for each URL group defined in Web applications	Number of synchronous threads Number of pending requests for URL groups Number of requests exceeding the upper limit of the number of requests pending for URL groups Number of received requests Number of responded requests

Note:

If an SFO server is a target for monitoring the statistics, you can acquire the statistics of JavaVM and process resources.

Hint

The following table describes the relationship of the number of pending requests for Web applications, Web containers, and URL groups.

Target	Items	Explanation
Web application	Number of pending requests for Web applications	Among the requests executed in a Web container, the number of pending requests for a Web application that controls the number of synchronous threads for Web applications. The number of pending requests for URL groups is not included.
	Number of entire pending requests for Web applications	Among the requests executed in a Web container, the number of pending requests for a Web application that controls the number of synchronous threads for Web applications. The number of pending requests for URL groups is also included.
Web container	Number of pending requests for Web containers or number of default pending requests	Among the requests executed in a Web container, the number of pending requests for a Web application that does not control the number of synchronous threads for Web applications.
	Number of entire pending requests for Web containers	The sum of the number of pending requests for Web containers and the number of the entire pending requests for all the Web applications.
URL group	Number of pending requests for URL groups	Among the requests executed in a Web container, the number of pending requests for a specific URL group that controls the number of synchronous threads for URL groups in a Web application controlling the number of synchronous threads for Web applications.