Hi...  Thanks a lot... So I tried under mine and got the following overall packaging 

So, would a ^GBLOCKCOPY return back space for me?

Thanks. Pleas let me know if the following work plan is correct...

1. Create a new temporary namespace and database using Configuration Manager.
2. Do ^GBLOCKCOPY from %SYS namespace to copy all the globals to the newly created temporary database
3. DELETE cache.dat
4. Create new cache.dat file
5. Again do a ^GBLOCKCOPY to copy all globals from newly created temporary database to the old one
6. Delete the newly created namespace and database.

Also would a direct DELETE cache.dat work?

Hi...

I tried the ^GBLOCKCOPY which seems to copy all the Globals from the particular database to other namespace.

The cache.dat under the existing namespace still has the same size.

Please let me know how to create a smaller cache.dat using the ^GBLOCKCOPY

Thanks!