Can an Oracle trigger be disabled for the current session?

Question

I\'d like to disable a specific trigger on a table prior to inserting data into it, but without affecting other users that may be changing data in that same tab

Answer 1

Use dbms_application_info.set_client_info (link to oracle documentation) to set_client_info in the procedure and read it in the trigger.

Simple example:

SET SERVEROUTPUT ON   
declare
CI_Status VARCHAR2(25 BYTE):='';
begin
--set the value
dbms_application_info.set_client_info('qwerty');
-- the value is sent an out to CI_Status when you want to read it
DBMS_APPLICATION_INFO.READ_CLIENT_INFO (CI_Status);
--Output the value in the console 
dbms_output.put_line('Value of CI_Status is: ' || CI_Status); 
end;

In your procedure:

procedure spname is
    begin
      dbms_application_info.set_client_info('qwerty');
      --Do your update
      UPDATE tableName set a=b;
      --in case you still have the sesion opened, set it to null after
      dbms_application_info.set_client_info(null);
end;

In you trigger:

create or replace TRIGGER Triggername
 BEFORE INSERT OR UPDATE
 ON tablename
 FOR EACH ROW
declare
CI_Status VARCHAR2(25 BYTE):='';
begin
--Retrieve the value into CI_Status the variable
DBMS_APPLICATION_INFO.READ_CLIENT_INFO(CI_Status); 
    IF INSERTING THEN
       null;
    ELSIF UPDATING THEN
          IF CI_Status = 'qwerty' then
             --Do nothing since you dont want the trigger to fire
              null;
          ELSIF CI_Status is null then
            :new.tablefield:= SYSDATE;
          END IF;
    END IF;
end Triggername;

To disable completely without worrying about concurrences

 procedure spname is
    begin    
      EXECUTE IMMEDIATE 'ALTER TRIGGER Triggername DISABLE';
      UPDATE tableName set a=b;
      EXECUTE IMMEDIATE 'ALTER TRIGGER Triggername ENABLE';
   end;