Disable all table constraints in Oracle
SqlOracleSql Problem Overview
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.
Sql Solutions
Solution 1 - Sql
It is better to avoid writing out temporary spool files. Use a PL/SQL block. You can run this from SQL*Plus or put this thing into a package or procedure. The join to USER_TABLES is there to avoid view constraints.
It's unlikely that you really want to disable all constraints (including NOT NULL, primary keys, etc). You should think about putting constraint_type in the WHERE clause.
BEGIN
FOR c IN
(SELECT c.owner, c.table_name, c.constraint_name
FROM user_constraints c, user_tables t
WHERE c.table_name = t.table_name
AND c.status = 'ENABLED'
AND NOT (t.iot_type IS NOT NULL AND c.constraint_type = 'P')
ORDER BY c.constraint_type DESC)
LOOP
dbms_utility.exec_ddl_statement('alter table "' || c.owner || '"."' || c.table_name || '" disable constraint ' || c.constraint_name);
END LOOP;
END;
/
Enabling the constraints again is a bit tricker - you need to enable primary key constraints before you can reference them in a foreign key constraint. This can be done using an ORDER BY on constraint_type. 'P' = primary key, 'R' = foreign key.
BEGIN
FOR c IN
(SELECT c.owner, c.table_name, c.constraint_name
FROM user_constraints c, user_tables t
WHERE c.table_name = t.table_name
AND c.status = 'DISABLED'
ORDER BY c.constraint_type)
LOOP
dbms_utility.exec_ddl_statement('alter table "' || c.owner || '"."' || c.table_name || '" enable constraint ' || c.constraint_name);
END LOOP;
END;
/
Solution 2 - Sql
To take in count the dependencies between the constraints:
SET Serveroutput ON
BEGIN
FOR c IN
(SELECT c.owner,c.table_name,c.constraint_name
FROM user_constraints c,user_tables t
WHERE c.table_name=t.table_name
AND c.status='ENABLED'
ORDER BY c.constraint_type DESC,c.last_change DESC
)
LOOP
FOR D IN
(SELECT P.Table_Name Parent_Table,C1.Table_Name Child_Table,C1.Owner,P.Constraint_Name Parent_Constraint,
c1.constraint_name Child_Constraint
FROM user_constraints p
JOIN user_constraints c1 ON(p.constraint_name=c1.r_constraint_name)
WHERE(p.constraint_type='P'
OR p.constraint_type='U')
AND c1.constraint_type='R'
AND p.table_name=UPPER(c.table_name)
)
LOOP
dbms_output.put_line('. Disable the constraint ' || d.Child_Constraint ||' (on table '||d.owner || '.' ||
d.Child_Table || ')') ;
dbms_utility.exec_ddl_statement('alter table ' || d.owner || '.' ||d.Child_Table || ' disable constraint ' ||
d.Child_Constraint) ;
END LOOP;
END LOOP;
END;
/
Solution 3 - Sql
It's not a single command, but here's how I do it. The following script has been designed to run in SQL*Plus. Note, I've purposely written this to only work within the current schema.
set heading off
spool drop_constraints.out
select
'alter table ' ||
owner || '.' ||
table_name ||
' disable constraint ' || -- or 'drop' if you want to permanently remove
constraint_name || ';'
from
user_constraints;
spool off
set heading on
@drop_constraints.out
To restrict what you drop, filter add a where clause to the select statement:-
- filter on constraint_type to drop only particular types of constraints
- filter on table_name to do it only for one or a few tables.
To run on more than the current schema, modify the select statement to select from all_constraints rather than user_constraints.
Note - for some reason I can't get the underscore to NOT act like an italicization in the previous paragraph. If someone knows how to fix it, please feel free to edit this answer.
Solution 4 - Sql
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;
/
Solution 5 - Sql
This can be scripted in PL/SQL pretty simply based on the DBA/ALL/USER_CONSTRAINTS system view, but various details make not as trivial as it sounds. You have to be careful about the order in which it is done and you also have to take account of the presence of unique indexes.
The order is important because you cannot drop a unique or primary key that is referenced by a foreign key, and there could be foreign keys on tables in other schemas that reference primary keys in your own, so unless you have ALTER ANY TABLE privilege then you cannot drop those PKs and UKs. Also you cannot switch a unique index to being a non-unique index so you have to drop it in order to drop the constraint (for this reason it's almost always better to implement unique constraints as a "real" constraint that is supported by a non-unique index).
Solution 6 - Sql
SELECT 'ALTER TABLE '||substr(c.table_name,1,35)||
' DISABLE CONSTRAINT '||constraint_name||' ;'
FROM user_constraints c, user_tables u
WHERE c.table_name = u.table_name;
This statement returns the commands which turn off all the constraints including primary key, foreign keys, and another constraints.
Solution 7 - Sql
It doesn't look like you can do this with a single command, but here's the closest thing to it that I could find.
Solution 8 - Sql
In the "disable" script, the order by clause should be that:
ORDER BY c.constraint_type DESC, c.last_change DESC
The goal of this clause is disable the constraints in the right order.
Solution 9 - Sql
This is another way for disabling constraints (it came from <https://asktom.oracle.com/pls/asktom/f?p=100:11:2402577774283132::::P11_QUESTION_ID:399218963817>;)
WITH qry0 AS
(SELECT 'ALTER TABLE '
|| child_tname
|| ' DISABLE CONSTRAINT '
|| child_cons_name
disable_fk
, 'ALTER TABLE '
|| parent_tname
|| ' DISABLE CONSTRAINT '
|| parent.parent_cons_name
disable_pk
FROM (SELECT a.table_name child_tname
,a.constraint_name child_cons_name
,b.r_constraint_name parent_cons_name
,LISTAGG ( column_name, ',') WITHIN GROUP (ORDER BY position) child_columns
FROM user_cons_columns a
,user_constraints b
WHERE a.constraint_name = b.constraint_name AND b.constraint_type = 'R'
GROUP BY a.table_name, a.constraint_name
,b.r_constraint_name) child
,(SELECT a.constraint_name parent_cons_name
,a.table_name parent_tname
,LISTAGG ( column_name, ',') WITHIN GROUP (ORDER BY position) parent_columns
FROM user_cons_columns a
,user_constraints b
WHERE a.constraint_name = b.constraint_name AND b.constraint_type IN ('P', 'U')
GROUP BY a.table_name, a.constraint_name) parent
WHERE child.parent_cons_name = parent.parent_cons_name
AND (parent.parent_tname LIKE 'V2_%' OR child.child_tname LIKE 'V2_%'))
SELECT DISTINCT disable_pk
FROM qry0
UNION
SELECT DISTINCT disable_fk
FROM qry0;
works like a charm
Solution 10 - Sql
with cursor for loop (user = 'TRANEE', table = 'D')
declare
constr all_constraints.constraint_name%TYPE;
begin
for constr in
(select constraint_name from all_constraints
where table_name = 'D'
and owner = 'TRANEE')
loop
execute immediate 'alter table D disable constraint '||constr.constraint_name;
end loop;
end;
/
(If you change disable to enable, you can make all constraints enable)
Solution 11 - Sql
You can execute all the commands returned by the following query :
select 'ALTER TABLE '||substr(c.table_name,1,35)|| ' DISABLE CONSTRAINT '||constraint_name||' ;' from user_constraints c --where c.table_name = 'TABLE_NAME' ;