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Run-Time Statistics for Stateful Session EJBs Raw Monitoring Data for Stateful Session EJBsTasks Related Topics
This page displays run-time statistics for stateful 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 Stateful 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 Stateful Session EJBs.
The statistics and underlying counts reflect activity since the bean was last deployed.
The following table defines the run-time statistics displayed for stateful session EJBs.
Table 89-1 Stateful Session EJB Run-Time Statistics
The cache miss ratio is a ratio of the number of times a container cannot find a bean in the cache (cache miss) to the number of times it attempts to find a bean in the cache (cache access). In general, the lower your cache miss ratio, the better your EJB will perform. The amount of time saved by getting a bean from the cache depends on the cost of the bean's For information on what to tune in response to the cache miss ratio statistic, see Cache Miss Ratio in the WebLogic Server Performance and Tuning Guide. |
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This is the ratio of the number of times a thread had to wait to obtain a lock on a bean to the total amount of lock requests issued. For best performance, you want the lock waiter ratio to be as low as possible. For information on what to tune in response to the lock waiter ratio statistic, see Lock Waiter Ratio in the WebLogic Server Performance and Tuning Guide. |
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This is the ratio of timeouts to accesses for the lock manager. Timeouts are very detrimental to performance and therefore, you should strive to keep your lock timeout ratio to an absolute minimum. Timeouts hurt performance on several levels. First, each thread waiting for a lock is one less thread that the server can be using to service other requests. Second, a lock timeout will result in an exception that will roll back the current transaction, erasing any work already done in the transaction and causing the current request to fail. For information on what to tune in response to the lock timeout ratio statistic, see Lock 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 Stateful Session EJBs are calculated. To display the counts on the EJB --> Monitoring -->Stateful Session EJBs tab page, select Customize this View and choose from the list of available data.
Table 89-2 Stateful Session EJB Raw Monitoring Data.
Tuning WebLogic Server EJBs in WebLogic Server Performance and Tuning.