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What are the 12 types of triggers in Oracle?

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What are the 12 types of triggers in Oracle?

Triggers on System Events and User Events

  • System events. Database startup and shutdown. Data Guard role transitions. Server error message events.
  • User events. User logon and logoff. DDL statements ( CREATE , ALTER , and DROP ) DML statements ( INSERT , DELETE , and UPDATE )

How do you check a trigger is fired or not in Oracle?

user_triggers is the table where all triggers created, specific to the schema, are located. So, SELECT STATUS FROM USER_TRIGGERS WHERE TRIGGER_NAME = ‘the_trigger_name’; will fetch the status of either ENABLED or DISABLED .

How do I delete a trigger in Oracle?

Use the DROP TRIGGER statement to remove a database trigger from the database. The trigger must be in your own schema or you must have the DROP ANY TRIGGER system privilege. To drop a trigger on DATABASE in another user’s schema, you must also have the ADMINISTER DATABASE TRIGGER system privilege.

How do I edit a trigger in Oracle?

Use the ALTER TRIGGER statement to enable, disable, or compile a database trigger. Note: This statement does not change the declaration or definition of an existing trigger. To redeclare or redefine a trigger, use the CREATE TRIGGER statement with the OR REPLACE keywords.

Why triggers are used in SQL?

Triggers are the SQL codes that are automatically executed in response to certain events on a particular table. These are used to maintain the integrity of the data. A trigger in SQL works similar to a real-world trigger. For example, when the gun trigger is pulled a bullet is fired.

Why triggers are written?

Triggers are written to be executed in response to any of the following events. A database manipulation (DML) statement (DELETE, INSERT, or UPDATE). A database definition (DDL) statement (CREATE, ALTER, or DROP). A database operation (SERVERERROR, LOGON, LOGOFF, STARTUP, or SHUTDOWN).

How do I know if a trigger is working?

To test if a trigger fires you can add a PRINT statement to the trigger (e.g. “PRINT ‘trigger fired!’ “), then do something that should trigger the trigger. If you get the printed text in your messages-tab in management studio you know it fired.

How do you check whether a trigger is enabled or disabled?

3 Answers

  1. Thanks! it is working.
  2. If you need to perform an action when a specific trigger is disable, you can use: if exists (SELECT name, is_disabled FROM sys.triggers where name =’MyTriggerName’ and is_disabled=1) /* perform the action */ – Marwan Almukh.

How do you remove a trigger?

To delete a DML trigger

  1. In Object Explorer, connect to an instance of Database Engine and then expand that instance.
  2. Expand the database that you want, expand Tables, and then expand the table that contains the trigger that you want to delete.
  3. Expand Triggers, right-click the trigger to delete, and then click Delete.

What command removes triggers?

Which statement is used to remove a trigger? Explanation: In order to delete a trigger, the DROP TRIGGER statement is used.

How do you modify a trigger?

To modify a DML trigger

  1. In Object Explorer, connect to an instance of Database Engine and then expand that instance.
  2. Expand the database that you want, expand Tables, and then expand the table that contains the trigger that you want to modify.
  3. Expand Triggers, right-click the trigger to modify, and then click Modify.

How do I open a trigger in SQL?

To view database level triggers, Login to the server using SQL Server management studio and navigate to the database. Expand the database and navigate to Programmability -> Database Triggers. To view triggers at the server level, Login to Server using SSMS and navigate to Server Objects and then Triggers folder.