3.3.1 Information Types that You Can Collect in Statistics Files

The statistics file output functionality outputs the operating information to a statistics file for each function of the J2EE server and batch server. The information related to server performance and server resources is output to a statistics file as the statistics. The following table shows the target server functions and the types of statistics that can be acquired.

Table 3‒4: Types of the statistics that you can acquire with each function
Functionality	Description of functionality	Type of the statistics
JavaVM	Java VM used by the J2EE server	JavaVM heap size Number of copy GC occurrences Number of Full GC occurrences 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 resource used by the J2EE 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

Tip

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.
Web application	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.
Web container	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.

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