I tried to create foreign ley constraint with index using following command: alter table spinfo add constraint fk11 foreign key (cbnum) references primary_info using index tablespace idx_space I got "ORA-01735: invalid ALTER TABLE option" on "using index tablespace idx_space". How to use "using index space" with foreign key? Thanks. __________________________________ Do you Yahoo!? Yahoo! Mail - You care about security. So do we. http://promotions.yahoo.com/new_mail -- //www.freelists.org/webpage/oracle-l