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Run-Time Statistics for Stateless Session EJBs Raw Monitoring Data for Stateless Session EJBsTasks Related Topics
This page displays run-time statistics for stateless session EJBs in the currently selected archive.You can display statistics for one or more server instances on which the EJB is deployed. The statistics are defined in Run-Time Statistics for Stateless Session EJBs.
You can tailor this console page to display some or all of the underlying counts from which the statistics are calculated, by clicking Customize this View, and selecting the desired data from the list of available columns. The available data is defined in Raw Monitoring Data for Stateless Session EJBs.
The statistics and underlying counts reflect activity since the bean was last deployed.
The following table defines run-time statistics displayed for stateless session EJBs.
Table 88-1 Stateless Session EJB Run-Time Statistics
The pool miss ratio is a ratio of the number of times a request was made to get a bean from the pool when no beans were available, to the total number of requests for a bean made to the pool. The consequence of a pool miss is different for different types of beans. A pool miss for a stateless session bean will cause the requesting thread to wait for a bean to become available in the pool. The maximum time a thread will wait is equal to the transaction timeout value for the bean. Entity beans and message-driven beans will never wait for an instance to become available. Instead, a pool miss will cause the pool to create a new bean instance to service the request. Pool misses come at a cost since the executing thread will either have to wait for a bean to become available or have to wait for a new bean to be created. As such, it is best to try to keep your pool miss ratio to a minimum. For information on what to tune in response to the pool miss ratio statistic, see Pool Miss Ratio in the WebLogic Server Performance and Tuning Guide. |
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The destroyed bean ratio is a ratio of the number of beans destroyed to the total number of requests for a bean. The EJB specification mandates that the EJB container destroys a bean when non-application exceptions are thrown from the bean during execution. Destroying beans comes at a cost, however, because destroyed beans will likely have to be replaced with new bean instances. As a result, you should keep your destroyed bean ratio to a minimum. For information on what to tune in response to the destroyed bean ratio statistic, see Destroyed Bean Ratio in the WebLogic Server Performance and Tuning Guide |
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The pool timeout ratio is a ratio of requests that have timed out waiting for a bean from the pool to the total number of requests made. This ratio is only valid for stateless session beans because it is the only type of bean that will wait for a bean to become available. Other types of beans will automatically create a new instance to service a request rather than waiting. For best performance, the pool timeout ratio should be as small as possible. For information on what to tune in response to the pool timeout ratio statistic, see Pool Timeout Ratio in the WebLogic Server Performance and Tuning Guide. |
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The transaction rollback ratio is the ratio of transactions that have rolled back to the number of total transactions involving the EJB. This information is useful for several reasons. First, it may be useful for signaling a problem with an application. For example, an unexpectedly high rollback ratio may be caused by a problem with a resource used by the application. It may also be useful in gauging the efficiency of an application. A high transaction rollback ratio may mean that a lot of work is being done only to eventually be rolled back, which is inefficient. For information on what to tune in response to the transaction rollback ratio statistic, see Transaction Rollback Ratio in the WebLogic Server Performance and Tuning Guide. |
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The transaction timeout ratio is the ratio of transactions that have timed out to the total number of transactions involving an EJB. Timeouts can be especially concerning because they are a signal of inefficiency. Every EJB request uses valuable server resources such as threads and bean instances. A timed out transaction means that server resources were tied up in vein. The transaction timeout ratio is a good indicator of a problem with an application. For information on what to tune in response to the transaction timeout ratio statistic, see Transaction Timeout Ratio in the WebLogic Server Performance and Tuning Guide. |
This section defines the underlying run-time counts from which the statistics in Run-Time Statistics for Stateless Session EJBs are calculated. To display the counts on the EJB --> Monitoring --> Stateless EJBs tab page, select Customize this View and choose from the list of available data.
Table 88-2 Stateless Session EJB Raw Monitoring Data
Tuning WebLogic Server EJBs in WebLogic Server Performance and Tuning