b2d3d22d_exes_Activity_on_DB2_for_i5_OS__System_column_name
[Column name] LAST_MTI_USED [Data type] TIMESTAMP [Description] Last time an MTI was used by the database because a matching permanent index did not exist [System column name] 
LASTMTIUSE
IBM Redbooks | Index Advisor Surfaces Maintained Temporary Indexes Activity on DB2 for i5/OS
System column name