Sas Version 9.0 -

I can help you with: The evolution of the software from Version 9.0 to 9.4 Comparing SAS Enterprise Guide with SAS Studio Common procedures (PROC) in SAS for data analysis

"Direct-addressed data storage and lookup was implemented as a Data Step Component Interface object. Easily controlled via the object-dot syntax, the hash object renders all standard table operations—insertion, search, and deletion—in constant time and much faster than any other built-in SAS lookup structure." Sas Version 9.0