Truncate table in Oracle getting errors

Question

I got the problem is when I run following command in Oracle, I encounter the error.

Truncate table mytable;

Errors:

Answer 1

Oracle 12c introduced a feature to truncate a table that is a parent of a referential integrity constraint having ON DELETE rule.

Instead of truncate table tablename; use:

TRUNCATE TABLE tablename CASCADE;

From Oracle truncate table documentation:

If you specify CASCADE, then Oracle Database truncates all child tables that reference table with an enabled ON DELETE CASCADE referential constraint. This is a recursive operation that will truncate all child tables, granchild tables, and so on, using the specified options.