Gene, In the event of a delete from the parent Oracle has a chance to check the child table(s) to see if the parent is still valid. But since a truncate is really a DDL, not DML, command there is no such chance. Therefore if you want to truncate a table you have to disable the foreign keys. Same thing as dropping a table, except that Oracle provided the 'cascade constraints' qualifier.
Dick Goulet ____________________Reply Separator____________________ Author: Gurelei <[EMAIL PROTECTED]> Date: 6/18/2002 5:43 AM Hi. I was trying to truncate a table, which is a parent to two other tables (its PK is referred to by two FKs from two other tables). These "other" tables are empty. When I tried to truncate the parent table, however, I got an error message ORA-02266: unique/primary keys in table referenced by enabled foreign keys. I thought that as long as the child tables are empty, the RI shouldn't matter, but I had to disable the FKs before being able to truncate the table. Is that the way Oracle checks truncates (no enabled RIs even if the tables are empty) or did I do something incorrectly? thanks Gene __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Gurelei INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).