Hash Table is term used in data base management system for increase the reliability of database management. It hashed table or Hash Table is a special type of internal table used in ABAP programs where by using the hash functionality, the necessary table record is obtained. Like other types of internal tables, hashed tables are also used to extract data from standard SAP database tables by means of ABAP programs or ABAP objects. However, unlike other types of internal tables like standard or sorted, Hash Table cannot be accessed using an index. As with database tables, hashed tables also require a unique key. Hash Table are also ideal for processing large amounts of data. Regardless of the number of table entries present, the response time for key access in a hashed table remains constant. Hash Table work comparatively faster only for full table keys and cannot work for ranges.