icf/shared_memory_cache_off is a SAP Parameter attribute which is used to control switch the ICF memory cache on/off information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter activates/deactivates the memory cache for ICF.
1 =
Runtime cache inactive and cache for service determination active
2 =
Runtime cache inactive and cache for service determination inactive
3 =
Runtime cache and cache for service determination inactive
See SAP Parameter Documentation for full SAP documentation for this profile parameter.