The concurrency rate exceeds {$ORACLE.CONCURRENCY.MAX.WARN}%. A high contention value does not indicate the root cause of the problem, but it is a signal to search for it. In the case of high competition, the analysis of resource consumption should be carried out. Which are the most "heavy" queries made in the database? Possibly, also session tracing. All this will help to determine the root cause and possible optimization points both in the database configuration and in the logic of building queries of the application itself.