IMS RACF ACEE Flood Control Enhancement for OTMA

With a large number of OTMA cached accessor environment elements (ACEEs), the default number of hash table entries is inefficient, causing long searches which increases CPU usage. The potentially high number of cached ACEEs delays the OTMA ACEE cleanup process. 

To address these problems, you can use the flood control option, which when it is turned on, user IDs with their ACEEs will be chained by using a Least Recently Used (LRU) concept. The LRU users will be pushed to the end of their hash index chain. Whenever a 2-minute cleanup timer pops, OTMA will work on each chain, start from the end, process 2% of user IDs for ACEE expiration.