Impdp errors with ORA-01400: cannot insert NULL into

Question

Hi Experts,
I have very intresting situation when I use impdp to import table back to DB.
Environment:
Database Server: 10.2.0.4 Enterprise
OS: RHEL 5.5 64-bit
We have a table and it's size is 350+ GB and so to reclaim space I want to perform expdp/impdp operation. When I following below steps:
1) expdp table
2) drop table
3) impdp full table
It works like a charm and I am able to reclaim 83% space and table size shows about 20GB.
But when I follow below method:
1) expdp table
2) truncate table (To save some time not to import indexes, stats, constraints , etc)
3) impdp table
I get following error:
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "SYS"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded
Starting "SYS"."SYS_IMPORT_TABLE_01": sys/******** tables=<schema>.<table_name> directory=test_dir dumpfile=<table_name>_%u.dmp logfile=impdp_<table_name>.log parallel=16 CONTENT=DATA_ONLY
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
ORA-31693: Table data object "<schema"."table_name" failed to load/unload and is being skipped due to error:
ORA-01400: cannot insert NULL into ("schema"."table_name"."ID")
Job "SYS"."SYS_IMPORT_TABLE_01" completed with 1 error(s) at 16:12:28
Please advise how to proceed further, it seems like I am hitting some sort of Bug but metalink does not show any.
Regards,
MS
Edited by: user10651321 on Nov 9, 2012 4:38 PM

Answer 1

expdp and impdp operations should not be executed as SYS - try SYSTEM account instead. See first Note section here - http://docs.oracle.com/cd/B19306_01/server.102/b14215/dp_import.htm#sthref243
Pl post the complete expdp and impdp commands used, along with a description of the table for which you encounter this error.
HTH
Srini