Got this error running 5.0.2 of CLM. What does it mean and how to resolve it? CRJAZ2284W The database performance measurement took 6052 ms. A value greater than 2500 ms is considered slow and might indicate a problem with the database.

 This is just a warning about the database performance as viewed from the application server.  It is suggesting that you may want to consider options for improving performance.  If this is not a real production server but a test server I would not worry about it.  
If you do decide to address the performance, I would look at the overall capability of the database server machine, how powerful is it, how much processing power, how much memory.  Another thing to consider is the latency between the database server and the application server.

https://jazz.net/forum/questions/206021/got-this-error-running-502-of-clm-what-does-it-mean-and-how-to-resolve-it-crjaz2284w-the-database-performance-measurement-took-6052-ms-a-value-greater-than-2500-ms-is-considered-slow-and-might-indicate-a-problem-with-the-database