[CONF] OpenJPA > Fetch Statistics

[confluence]

Fetch Statistics Page edited by Rick Curtis Changes (2) ... * JSE - Append the path of openjpa-fetch-statistics-version-SNAPSHOT.jar file to the classpath prior to lanuching the JVM. * [Websphere Application Server|For Websphere Application Server] * OSGi -- ?? -- Probably need another module that creates a proper bundle. h32. Statistics Collecting and Monitoring {warning:title=Performance Consideration} There will be a large performance impact when running this tooling. It is not supported, nor recommended for production use. This tool should not be used on a production machine. ... Full Content Fetch Statistics The OpenJPA Fetch Statistics Tool (FST) monitors persistent field access and helps determine which fields in an application are not used. This tool is a development / test time tool that can help a developer properly tune an application. Note Currently, FST only works with runtime enhancement (javaagent or in JEE container hook). The persistent fields which satisfy all the following conditions will be tracked : The field has EAGER fetch mode. The field is not primary key. The field is not defined as a version field. Download The latest OpenJPA Tools JAR file can be download from the SNAPSHOT Repository or can be built from the source code in svn by using Maven 2.2.1 and Java SE 6. Configuration JSE - Append the path of openjpa-fetch-statistics-version-SNAPSHOT.jar file to the classpath prior to lanuching the JVM. Websphere Application Server OSGi – ?? – Probably need another module that creates a proper bundle. Statistics Collecting and Monitoring Performance Consideration There will be a large performance impact when running this tooling. It is not supported, nor recommended for production use. This tool should not be used on a production machine. When this tool is configured, it will be active for all persistence units in the JVM. Statistics will be dumped via the openjpa.Runtime channel with the INFO level every 10 minutes, or when the JVM terminates. Example output [7/13/12 9:05:44:265 CDT] 00000072 Runtime I CWWJP9990I: openjpa.Runtime: Info: Successfully collected fetch statistics from Entities [org.apache.openjpa.test.Address]. The following fields are FetchType.EAGER and were never fetched [ total 7 ] : org.apache.openjpa.test.Address.city org.apache.openjpa.test.Address.country org.apache.openjpa.test.Address.phone org.apache.openjpa.test.Address.state org.apache.openjpa.test.Address.street1 org.apache.openjpa.test.Address.street2 org.apache.openjpa.test.Address.zip Configuration removal Stop the JVM and reverse the steps completed to configure the tool. Change Notification Preferences View Online | View Changes | Add Comment