To answer this question, you need to understand the purpose and use cases of database triggers. Let's go through each option to understand why it is correct or incorrect:
Option A) To duplicate the functionality of other triggers - This option is incorrect. Triggers are not designed to duplicate the functionality of other triggers. Instead, triggers are used to perform specific actions when certain events occur in the database.
Option B) To replicate built-in constraints in the Oracle server such as primary key and foreign key - This option is incorrect. Built-in constraints like primary key and foreign key are not replicated using triggers. Constraints are used to enforce data integrity rules, while triggers are used to perform actions based on specific events.
Option C) To guarantee that when a specific operation is performed, related actions are performed - This option is correct. One of the main purposes of database triggers is to ensure that when a specific operation (such as an insert, update, or delete) is performed on a table, related actions or operations are also performed. Triggers can be used to automatically update other tables, perform calculations, or enforce business rules.
Option D) For centralized, global operations that should be fired for the triggering statement, regardless of which user or application issues the statement - This option is correct. Triggers can be designed to perform centralized, global operations that should be triggered regardless of the user or application issuing the statement. This allows for consistent and standardized actions to be performed for specific events.
Therefore, the correct answers are C) To guarantee that when a specific operation is performed, related actions are performed and D) For centralized, global operations that should be fired for the triggering statement, regardless of which user or application issues the statement.