Essbase supports Microsoft 4 GB Tuning (4GT). 4GT enables users with extremely large databases to take advantage of a larger address space to improve performance.
Enabling the Windows 4GT feature may benefit users if the Essbase installation has the following characteristics:
Essbase is configured to use direct I/O. Enabling 4GT on Essbase installations configured for buffered I/O is not recommended.
The index and data caches are sized correctly, and Essbase performance is consistently improved by increasing the data file cache, but further increases are bounded by the previous 2 GB addressability limitation. For information about setting cache values, see Optimizing Essbase Caches.
For additional information about the Microsoft Windows 4GT feature, see http://www.microsoft.com.