The users on your database are complaining of slow response to their queries. You are using the Automatic Database Diagnostic Monitor (ADDM) to monitor the database. The ADDM discovers that the log files in your database are small. Which other problems can the ADDM detect? (Choose all that apply.)

1. high checkpoint load cause

2. high PL/SQL and Java execution time

3. lock contention

4. missing offline datafiles

5. contention on the undo tablespace

6. tablespace fragmentation