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 Data Manipulation (DML) StatementsBuilt-in Scalar Functions 

Database Triggers

A trigger associated with a database or transaction event can be defined for the following events:

Connecting to a database

ON CONNECT

Before the trigger is executed, a transaction is automatically started with the default isolation level (snapshot (concurrency), write, wait)

Disconnecting from a database

ON DISCONNECT

Before the trigger is executed, a transaction is automatically started with the default isolation level (snapshot (concurrency), write, wait)

When a transaction is started

ON TRANSACTION START

The trigger is executed in the transaction context of the started transaction (immediately after start)

When a transaction is committed

ON TRANSACTION COMMIT

The trigger is executed in the transaction context of the committing transaction (immediately before commit)

When a transaction is cancelled

ON TRANSACTION ROLLBACK

The trigger is executed in the transaction context of the rolling back transaction (immediately before roll back)

DDL Triggers

DDL triggers fire on specified metadata change events in a specified phase.BEFORE triggers run before changes to system tables.AFTER triggers run after changes to system tables.

DDL triggers are a specific type of database trigger, so most rules for and semantics of database triggers also apply for DDL triggers.