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