ORA-02266: unique/primary keys in table referenced by enabled foreign keys getting while import

Error:
ORA-39120: Table "SCHEMA"."TESTTAB" can't be truncated, data will be skipped. Failing error is:
ORA-02266: unique/primary keys in table referenced by enabled foreign keys
ORA-00955: name is already used by an existing object

Solution:

Step-1: Use below query to disable constraint

select 'alter table '||a.owner||'.'||a.table_name||' disable constraint '||a.constraint_name||';'

from user_constraints a, all_constraints b

where a.constraint_type = 'R'

and a.r_constraint_name = b.constraint_name

and a.r_owner  = b.owner

and b.table_name = 'TESTTAB';

Output:

alter table SCHEMA.TESTTAB disbale constraint TESTTAB_DG_FK1;

alter table SCHEMA.TESTTAB disable constraint TESTTAB_DG_FK2;

Step-2

Then start import job again