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What events will fire a DDL trigger?
A DDL trigger can fire after execution of any Transact-SQL event that belongs to a predefined grouping of similar events. For example, if you want a DDL trigger to fire after any CREATE TABLE, ALTER TABLE, or DROP TABLE statement is run, you can specify FOR DDL_TABLE_EVENTS in the CREATE TRIGGER statement.
What is the purpose of using DB trigger?
A database trigger is procedural code that is automatically executed in response to certain events on a particular table or view in a database. The trigger is mostly used for maintaining the integrity of the information on the database.
What is DML trigger in SQL Server?
DML triggers is a special type of stored procedure that automatically takes effect when a data manipulation language (DML) event takes place that affects the table or view defined in the trigger. DML events include INSERT, UPDATE, or DELETE statements.
Is create trigger DDL?
SQL Server DDL triggers respond to server or database events rather than to table data modifications. These events created by the Transact-SQL statement that normally starts with one of the following keywords CREATE , ALTER , DROP , GRANT , DENY , REVOKE , or UPDATE STATISTICS .
What is purpose of triggers?
Triggers are stored programs, which are automatically executed or fired when some events occur. Triggers are, in fact, 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).
When to use a DDL trigger in a database?
If you need to support your Engineering team with a simple record of all DDL statements (Data Definition Language) run against a database, then I recommend using DDL Triggers. A DDL Trigger is comparable to a stored procedure except it gets activated when any DDL event for which it was created occurs.
Is it a good idea to use DDL for schema changes?
The concept is almost trivial and because DDL changes are usually not in performance-critical code-paths, the theoretical overhead on the DDL statement-runtimes is not relevant. (Unless frequent schema-changes are part of a performance-sensitive workload – in which case I would then question if using DDL is a good idea at all in such a place.
Why do I need to Log Schema changes?
The motivation is roughly about troubleshooting schema-changes. The aim is not to detect security breaches or even to support tamper-proof security investigations. If that is the case, my advice here is to not use Auditing at all for such purpose.