How does a LOGON trigger work in SQL Server?

How does a LOGON trigger work in SQL Server?

SQL Server automatically executes the logon triggers once a logon event occurs. It gets executed before a user session is established and authentication is successful. We use two terms for a database successful connection in any database. Authentication: We specify a username and password to connect using SQL authentication.

Which is the first trigger in the logon event?

Specifying First and Last Trigger. Multiple triggers can be defined on the LOGON event. Any one of these triggers can be designated the first or last trigger to be fired on an event by using the sp_settriggerorder system stored procedure. SQL Server does not guarantee the execution order of the remaining triggers.

What is the transaction count for a LOGON trigger?

SQL Server starts an implicit transaction before the logon triggers fires. It is independent of any user transaction. In the case of the logon trigger, the transaction count is 1. In case SQL returns an exception, its value sets to zero.

How is a logon event different from an event notification?

Note that the LOGON event corresponds to the AUDIT_LOGIN SQL Trace event, which can be used in Event Notifications. The primary difference between triggers and event notifications is that triggers are raised synchronously with events, whereas event notifications are asynchronous.

Why is MY SQL Server logon not working?

You might have previously had a logon trigger that evaluated if you were allowed to log in to the SQL Server or not. This trigger may have been removed or might produce wrong results which now does not allow anybody to log in to the SQL Server instance. 1. Open Query Window Available

Is it possible to be immune from LOGON trigger failing?

Updated December 1, 2005 – a couple of people have pointed out it just takes the administer Database Trigger privilege to be immune from a logon trigger failing.