This article discusses a method to trigger the Network Monitor (NetMon)
utility to run based on a specific error happening. You can set up SQL
Enterprise Manager to respond automatically to SQL Server events, either by
executing a task that you have defined or by sending an e-mail and/or a
pager message to an operator that you have specified.
The example included in the procedure below will start the NetMon utility
based on the SQL Server logging a user-defined error message. This example
will also use the Windows NT AT Scheduler. Because the Scheduler can only
be defined with future events, the initial error message may not appear in
the capture, but subsequent occurrences will be captured.
The example included in the procedure below requires the Network Monitor
tool to be installed on the same computer as SQL Server. NetMon will
capture all network traffic between specific computers. For additional
information about how to install NetMon or read NetMon traces, please see
the following article in the Microsoft Knowledge Base:
: How to Capture Network Traffic with Network Monitor
How to automate running NetMon.exe based on a user defined error message
The example below is useful in capturing events that occur with a high
frequency. To automate NetMon, perform the following steps. If you need
additional information about how to accomplish any of the tasks below,
refer to the appropriate topic in SQL Server Books Online.
- Create a new alert and supply the following values:
Name: My Test alert
Severity: 016 - Miscellaneous User Error
Error Message Contains this text: << Text of message >>
Tasks to Execute: Startup Netmon
Optional: Alert Notification Message to send to Operator: "User
Errors are occurring"
- Create a new task and supply the following values:
Name: Startup Netmon
Command: exec RunNetmon
Options: Write to the Windows NT application event log on failure
NOTE: This check box is available in the New Task dialog box.
- Create a table with the following structure:
CREATE TABLE dbo.TempTime
(Sched_Time char (5) NOT NULL ,
Last_run datetime NOT NULL)
- Create a stored procedure called "RunNetmon" using this code:
create procedure RunNetmon
-- We may only want this stored procedure to run once on demand.
-- If the error occurs frequently the following stored procedure will
-- only allow it to run once in a day. Otherwise, this sample will start
-- multiple sessions of Netmon.exe on the server.
if (select count(*) from TempTime
where convert(char(8),Last_run,3) = convert(char(8),getdate(),3) ) = 0
print'table is empty. Inserting row...'
insert into TempTime (Sched_Time, Last_run) values (
convert(char(2),datepart(hour,getdate() )) +":" +
convert(char(2),datepart(minute,getdate()) +1) ,getdate() )
-- Adds 1 minute to the current time for the scheduled time.
declare @mytime1 char(32)
declare @mystring varchar(255)
select @mytime1 = (select Sched_Time from TempTime)
-- Compose the scheduled task from NT AT scheduler
select @mystring = "AT " + @mytime1 +
" /interactive c:\winnt\system32\netmon\netmon.exe /buffersize:15728640
-- Load AT scheduler
exec master..xp_cmdshell @mystring
-- Display the current scheduled events
exec master..xp_cmdshell "AT"
print 'This stored procedure has already run today. '
Article ID: 198473 - Last Review: October 26, 2013 - Revision: 4.0
- Microsoft SQL Server 6.5 Standard Edition
- Microsoft SQL Server 6.5 Enterprise Edition
- Microsoft SQL Server 7.0 Small Business Server Edition
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