Free space management is an essential technique used in the DB2 data base management that improves performance of OLTP transactions. DB2 V11 for z/os provides space management enhancement that reduces indirect reference resulting in improved query performance. The presenter will provide a comprehensive overview of free space management and its usage technique in order to benefits this feature in OLTP transactions. The contents includes:1.Introduction to DB2 free space management2.The cause of indirect reference 3.The performance impact of indirect reference4.V11 enhancements for indirect reference5.V11 early performance result