Note:

Best practice recommends that point-level security application overrides should be used sparingly and judiciously. A memory-resident cache is used to check if points and/or facilities are configured with an application override. Long running security checks are completed in the background instead of blocking the updating of the client user interface until the checks complete. While this recommendation has no enforcement, it is possible for point-level security application overrides to become excessive, hindering client application performance.

A system with less than 1000 point records assigned an application override is considered reasonable. However, when the number of point records assigned an application override exceeds 10,000, significant performance degradation can occur when resolving security access in various client applications. The existing recommendation of sparse and judicious use of point-level security application overrides is encouraged.

FAC and PNT security overrides do NOT prevent administrative applications such as CygNet Explorer from reading data. However it does prevent CygNet Studio files from reading data. Also, ODBC will not honor the FAC and PNT overrides.