Just for your information. in 11gR2 a datapump export of a partitioned IOT might fail with following error: Starting "SCOTT"."SYS_EXPORT_SCHEMA_03": USERID=scott/******** schemas=scott DIRECTORY=RESTORE_scott COMPRESSION=all REUSE_DUMPFILES=Y LOGFILE=expdp_scott.bck.log dumpfile=expdp_scott.bck.dmp Estimate in progress using BLOCKS method... Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA *ORA-39126*: Worker unexpected fatal error in KUPW$WORKER.GET_TABLE_DATA_OBJECTS [] *ORA-01427*: single-row subquery returns more than one row this is Bug 9214753: EXPDP RETURNS ORA-1427 WHEN SAME PARTITIONED IOT EXISTS IN EXPORTING SCHEMA solution is to add following line in subselect in select list of view ku$_iotpart_data_view (created in catmeta.sql): create or replace force view ku$_iotpart_data_view of ku$_table_data_t with object OID(obj_num) as select '1','2', ip.obj#, (select o1.obj# from obj$ o1 where o1.name=bo.name and o1.subname=o.subname and o1.owner#=o.owner_num -- <<<< fix for bug 9214753 ) ,o.subname, NULL, ... hth, Andre