In order to analyse if the currently used database setup is sufficient for the running Confluence instance I need to see how much concurrent connections are used by the instance.
In the documentation is stated: "To assess whether you need to tune your database connection pool, take thread dumps during different times (including peak usage). Inspect how many threads have concurrent database connections." - https://confluence.atlassian.com/x/8fwB
Whats the best way to find the number of concurrent connections in the thread dump? What are the keywords (class names) to search for?
Depending on you database connection method (datasource or direct JDBC), and your database, I'll suggest you to search for the driverclass of your database river.
In my scenario, using oracle I may search for "oracle.jdbc.driver".
Another option is the admin console of your application server: tomcat, jboss, weblogic ... Most of them have a option to see the current size of the datasources: min, max, current-in-use... etc.
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