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

Issue:

Error “ORA-02266: unique/primary keys in table referenced by enabled foreign keys” when trying to truncate a table.

Error Message:

SQL> truncate table TABLE_NAME;  

truncate table TABLE_NAME
           *
ERROR at line 1:
ORA-02266: unique/primary keys in table referenced by enabled foreign keys

Solution: -- Find the referenced foreign key constraints.

 SQL> select 'alter table '||a.owner||'.'||a.table_name||' disable constraint '||a.constraint_name||';'
  2  from all_constraints a, all_constraints b
  3  where a.constraint_type = 'R'
  4  and a.r_constraint_name = b.constraint_name
  5  and a.r_owner  = b.owner
  6  and b.table_name = 'TABLE_NAME';

    'ALTER TABLE'||A.OWNER||'.'||A.TABLE_NAME||'DISABLE CONSTRAINT'||A.CONSTRAINT_NAME||';'
    ---------------------------------------------------------------------------------------------------------
    alter table SCHEMA_NAME.TABLE_NAME_ATTACHMENT disable constraint CONSTRAINT_NAME;    
alter table SCHEMA_NAME.TABLE_NAME_LOCATION disable constraint CONSTRAINT_NAME;

-- Disable them

alter table SCHEMA_NAME.TABLE_NAME_ATTACHMENT disable constraint CONSTRAINT_NAME;
alter table SCHEMA_NAME.TABLE_NAME_LOCATION disable constraint CONSTRAINT_NAME;

-- Run the truncate

SQL> truncate table TABLE_NAME;

Table truncated.

-- Enable the foreign keys back

 SQL> select 'alter table '||a.owner||'.'||a.table_name||' enable constraint '||a.constraint_name||';'
  2  from all_constraints a, all_constraints b
  3  where a.constraint_type = 'R'
  4  and a.r_constraint_name = b.constraint_name
  5  and a.r_owner  = b.owner
  6  and b.table_name = 'TABLE_NAME';

'ALTER TABLE'||A.OWNER||'.'||A.TABLE_NAME||'ENABLE CONSTRAINT'||A.CONSTRAINT_NAME||';'
--------------------------------------------------------------------------------

alter table SCHEMA_NAME.TABLE_NAME_ATTACHMENT enable constraint CONSTRAINT_NAME;
alter table SCHEMA_NAME.TABLE_NAME_LOCATION enable constraint CONSTRAINT_NAME;

-- Enable them

alter table SCHEMA_NAME.TABLE_NAME_ATTACHMENT enable constraint CONSTRAINT_NAME;
alter table SCHEMA_NAME.TABLE_NAME_LOCATION enable constraint CONSTRAINT_NAME;