how to identify the usage of an specific sql login I'm examining a Database Server which have several sql logins.there is a specific sql login with sysadmin server Role which i can't find where exactly is its usage. On sp_who2 result this login is used with BACKGROUND status which is running commands Like LOG WRITER ,RECOVERY WRITER,LAZY WRITER,XE TIMER,TRACE QUEUE TASK,TRACE QUEUE TASK &amp;c.

Now I want to know where is the usage of this SQL Login, because I want to change its password.
As all the sessions for that user are system processes per your comment, this is the system itself, i.e. the "sa" account and/or the SQL Server Service account using Trusted Authentication.