In one of our development server we will be frequently running trace files to capture information for performance trouble shooting. However this in turn writes so many entries about trace file in errorlog which fills the errorlog. Errorlog entry is big and we are not to search it easily so to avoid the trace information we used trace flag 3688 in startup parameter of SQL Server. Refer KB article http://support.microsoft.com/kb/922578 for more.
You will see similar information like below
2011-08-03 22:04:15.000 spid52 SQL Trace ID 2 was started by login “sa”.
2011-08-03 22:04:16.690 spid53 SQL Trace stopped. Trace ID = ’2′. Login Name = ‘sa’.
2011-08-03 22:04:26.070 spid52 SQL Trace ID 2 was started by login “sa”.
2011-08-03 22:04:27.750 spid53 SQL Trace stopped. Trace ID = ’2′. Login Name = ‘sa’.
I’ve added the trace flag to SQL Server as shown below, this change requires SQL Server to get restarted so ensure you have restarted SQL Server service after you added this trace flag. To know full steps for adding trace flag check the article “Enable \ Disable Trace Flag in SQL Server”
Thus you can utilize the trace flag 3688 if you have more number of trace flags running and filling up your errorlog.