![]() If you are developing your applications with JPA, all you need to set the property hibernate.show_sql to true in your persistence.xml file. ![]() The second important thing I mentioned that it is worth to notice is that we can define Event settings - file which allows customizing what events are record and how often.In order to show the SQL which Hibernate generates behind the hoods, you need to enable a property in your configuration file. Update hibernate sequence set nextval= 6 where next_val=5 Select next val as idval from hibernate_sequence for update Time fixed is very nice to sample your Java application once for a given time and then when recording is finished JMC will automatically load and display collected data - for Continuous type you would have to manually dump recordings to a file and then load them in JMC. First is that there are two types of recordings Time fixed where we define the time of recording and Continuous where we define the maximum size and age of these recordings. There are two important things to be aware of while configuring recording (this applies to other two ways as well). Assuming there is a running Java application supporting JFR, then we can select process under which this application runs and start recording as shown below. Beside displaying these data it can interact with JFR to start recordings. The main purpose of this tool is to analyze JFR recordings through a graphical interface. There are three ways to “record flights”. Let’s start wit creating and tell HIbernate to use it. To make things easier and focus mostly on creating we will use datasource-proxy - library which gives easy access to what is needed. ![]() Datasource proxyįirst, to be able to get access to SQL statements and parameters passed to JDBC it would be required to intercept appropriate methods from JDBC API through a proxy around. JMC Agent: "Hold my □!" /f5S5hSf5Tj- Gunnar Morling □ October 17, 2020Īlthough it’s not visible on the Gunnar’s screen if he logs SQL statements together with parameters I thought it would be a great exercise to see if I could do the similar thing using JFR and have full SQL statements that can be copy-pasted to an SQL editor. □□: "If we only could log SQL statements executed by with Flight Recorder." I got inspired by Gunnar Morling and his tweet Collect JDK Flight Recorder events at runtime with JMC Agent.Get started with JDK Flight Recorder in OpenJDK 8u.If videos are not your thing and you prefer to read then I recommend following blog posts from redhat: I encourage you to watch the full presentation as it is very enlightening in terms of JFR topic.
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