This advanced option can be used to "force" the cache to be kept in the physical memory (RAM) of the machine when the database is executed by 4D Runtime (all versions) or 4D Server under MacOS.

Under Mac OS, by default the cache can be flushed in part or entirely in the virtual memory of the machine when necessary (the virtual memory is an area set aside on the hard disk). Since accessing the cache is critical to the performance of your 4D applications, you can check this option in order for the cache to be kept permanently in physical memory. Of course, the machine configuration (size of RAM, number of applications running simultaneously, etc.) must be compatible with this principle.

This option does not affect the operation of applications run with the 4th Dimension single-user application.