MarkLogic 9 Product Documentationfn:trace
fn:trace( $value as item()*, $label as xs:string ) as item()*
Summary
Return the input $value unchanged and, if $label is the name of
an enabled server event, log event to the App Server log file
<install_dir>/Logs/<port>_ErrorLog.txt; where
<install_dir> is the MarkLogic install directory,
and <port> is the port number of the current App
Server or "TaskServer" if the current request is running on the Task
Server.
| Parameters | |
|---|---|
| value | The values to trace. |
| label | A string label for the trace output. |
Usage Notes
In order for the trace event to print out in the log, you must enable the trace event in the Diagnostics page (Groups > group_name > Diagnostics ) of the Admin interface for the specified label.Example
fn:trace("This is a trace event.", "MY TRACE EVENT")
=> If MY TRACE EVENT is defined as an enabled trace event
in the Diagnostics page of the Admin interface, then a
message similar to the following is added to the log:
2015-03-20 17:56:09.346 Info: [Event:id=MY TRACE EVENT]
This is a trace event.