Hi, This table is used to store PL/SQL and view source code. By chance, does your system include a process to dynamically create views or PL/SQL objects? A query like the following may help track down the culprit: SELECT * FROM (SELECT owner , object_name , object_id , created FROM dba_objects, (SELECT DISTINCT obj# FROM SYS.idl_ub1$) WHERE obj# = object_id ORDER BY created DESC) WHERE ROWNUM < 100; Cheers, Tim > Hi folks: > I am coming up with a strange problem. > my system tablespace keep on increasing every day by 100M. > and i query the v$dba_segments ,then i found this table: IDL_UB1$ size is > 15031091200bytes. > it have got 114679 extents. > BTW,my sytem data file's size is almost the same as IDL_UB1$. > Can some one throw some light on it,that would be appreciate. > -- //www.freelists.org/webpage/oracle-l