SQL Server Trace Flag 4013

Hi Friends,

This is my 39th blog on SQL Server Trace Flag 4013 in the series of One Trace Flag a Day. You can go to all blogs under that series by clicking here.

Trace flag 4013 write entries in error log whenever a new connection established. These entries contain login name and SPID also. Let me enable this trace flag first.

use master
exec sp_cycle_errorlog

Now you can try to make a new connection. Let me try to connect the same instance through SSMS for login as sa. Now run the below commend.

exec xp_readerrorlog

The output will show you some entries like mention below:

Login: sa WIN-XXXXXX server process ID (SPID): xx, kernel process ID (KPID): xx.

If you ever used this trace flag ever for troubleshooting kind of thing then we will be more than happy to read your comments.


Don’t forget to turn off the trace flag.

use master

PS: Do not use trace flags in production environment without testing it on non production environments and without consulting because everything comes at a cost.


Prince Kumar Rastogi

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About Prince Rastogi

Prince Rastogi is working as Database Administrator at Elephant Insurance, Richmond. He is having more than 8 years of experience and worked in ERP Domain, Wealth Management Domain. Currently he is working in Insurance domain. In the starting of his career he was working on SQL Server, Internet Information Server and Visual Source Safe. He is post graduate in Computer Science. Prince is ITIL certified professional. Prince likes to explore technical things for Database World and Writing Blogs. He is Technical Editor and Blogger at SQLServerGeeks.com. He is a regular speaker at DataPlatformDay events in Delhi NCR. He has also presented some in depth sessions about SQL Server in SQL Server Conferences in Bangalore.

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