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Run-Time Statistics for Entity EJBs Raw Monitoring Data for Entity EJBs Tasks Related Topics
This page displays run-time statistics for entity 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 Entity 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 Entity EJBs.
The statistics and underlying counts reflect activity since the bean was last deployed.
The following table defines the run-time statistics displayed for entity EJBs.
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 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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Reports whether the EJB container has successfully connected to the JMS destination source and that therefore the message-driven bean is receiving messages. If this field's value displays as |
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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 Entity EJBs are calculated. To display the counts on the EJB --> Monitoring --> Entity EJBs tab page, select Customize this View and choose from the list of available data.
Table 91-2 Entity EJB Raw Monitoring Data
Tuning WebLogic Server EJBs in WebLogic Server Performance and Tuning.