Is it really so? Consistency is enforced bellow indexes or tables. It is enforced at block level. The previous version of the index should still see the previous version of the table blocks, shouldn't it? -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Jonathan Lewis Possible cause: ORA-01410 can be the result of one session working through a long running query that depends on an index that gets rebuilt by another session The index "moves", but the first session is still using the previous version of the index (read consistency across DDL). If the space freed by the rebuild is then re-used, the first session is likely to crash with a 1410. Fyrirvari/Disclaimer http://www.landsbanki.is/disclaimer -- //www.freelists.org/webpage/oracle-l