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
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