Hi There is formula from Navision to find out the size of DBMS cache. DBMS Cache = Physical memory - Memory required by OS - 50Kb * No.workstations - 1 MB (For NF server) - Memory required by other Programs And It should be at least 10% of Active data size of the database. Maximum size of the Database cache is 1 GB If the Database cache is greater than the available memory, system will create swap files and it may slowdown the system. Commit cache takes up space in the DBMS cache. So it can be up to 2/3 of the allocated DBMS cache. Commit cache optimize the activities of database. It gives good performance. But please remember,use commit cache only if you think your system is fully consistent. Refer Navision installation manual for more about commit cache. Regards Joseph Mathew Edited by - joseph_mathew on 2001 May 16 12:45:22