Disable all table constraints in Oracle

Question

How can I disable all table constrains in Oracle with a single command? This can be either for a single table, a list of tables, or for all tables.

Answer 1

Use following cursor to disable all constraint.. And alter query for enable constraints...

DECLARE

cursor r1 is select * from user_constraints;
cursor r2 is select * from user_tables;

BEGIN
  FOR c1 IN r1
  loop
    for c2 in r2
    loop
       if c1.table_name = c2.table_name and c1.status = 'ENABLED' THEN
        dbms_utility.exec_ddl_statement('alter table ' || c1.owner || '.' || c1.table_name || ' disable constraint ' || c1.constraint_name);
       end if;
    end loop;
  END LOOP;
END;
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