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Don Burleson Blog 







Oracle Disable Constraints

Oracle Database Tips by Donald Burleson

There are multiple ways to disable constraints in Oracle.

The "alter table" disable constrains syntax can be used to disable constraints in Oracle

alter table
DISABLE constraint

Another way to enable and disable constraints in Oracle would be to either use a plsql block or write a script.

Here is a script that makes use of Oracle disable constraint:

for i in (select constraint_name, table_name from user_constraints) LOOP
execute immediate 'alter table '||i.table_name||' disable constraint '||i.constraint_name||'';
end loop;

or here is an alternate example of Oracle disable constraints:

select 'alter table '||table_name||' disable constraint '||constraint_name||';' from user_constraints;

Be careful when disabling constraints in Oracle, because of the implicit commits in DDL statements like this, sometimes you will find it necessary to "cache" the results of the cursor before starting to execute the DDLs used to disable constraints and avoid "snapshot too old" errors. This only happen occasionally, but if it does use this method to disable constraints in Oracle:

  Type    varchar2Array is table of varchar2(1000) index by binary_integer;
  tabCons mypkg.varchar2Array;
select constraint_name Bulk Collect Into tabCons
  select constraint_name
  from    user_constraints
  where table_name = :tab_name
  If    tabSQL.count > 0 Then
      For    numCount in tabCons.first .. tabCons.Last
          Execute Immediate 'alter table '||:tab_name||' disable constraint '||tabCons(numCount);
      end loop;
  End If;

The last way to disable constraints in Oracle would be to create a procedure to disable constraints. Prior to using this method to disable constraints all foreign keys must be disabled.  An error would result from using this method to disable constraints if a pk is disabled while an fk is referring to it.

Oracle disable constraint


View more of my notes related to disabling Oracle constraints here:

Oracle "alter table" constraint syntax examples

Enabling and Disabling Constraints

Overhead of Constraints on DML Performance





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