b2d3d22d_exes_Activity_on_DB2_for_i5_OS__System_column_name
[Column name] LEADING_COLUMN_KEYS [Data type] VARCHAR(16000) [Description] Leading, Order Independent keys, the keys at the beginning of the KEY_COLUMNS_ADVISED field that could be reordered and still satisfy the index being advised [System column name] 
LEADKEYS
IBM Redbooks | Index Advisor Surfaces Maintained Temporary Indexes Activity on DB2 for i5/OS
System column name