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How to: Modify an Existing Trace (Transact-SQL)

This topic describes how to use stored procedures to modify an existing trace.

To modify an existing trace

  1. If the trace is already running, execute sp_trace_setstatus by specifying @status = 0 to stop the trace.

  2. To modify trace events, execute sp_trace_setevent by specifying the changes through the parameters. Listed in order, the parameters are:

    • @traceid (Trace ID)

    • @eventid (Event ID)

    • @columnid (Column ID)

    • @on (ON)

    When you modify the @on parameter, keep in mind its interaction with the @columnid parameter:

    ON

    Column ID

    Result

    ON (1)

    NULL

    Event is turned on. All columns are cleared.

     

    NOT NULL

    Column is turned on for the specified event.

    OFF (0)

    NULL

    Event is turned off. All columns are cleared.

     

    NOT NULL

    Column is turned off for the specified event.

Important

Unlike regular stored procedures, parameters of all SQL Server Profiler stored procedures (sp_trace_xx) are strictly typed and do not support automatic data type conversion. If these parameters are not called with the correct input parameter data types, as specified in the argument description, the stored procedure returns an error.