Use trace with IBM MQ client on IBM i

On IBM® i, there is no Control Language (CL) command to capture the trace when using a stand-alone IBM MQ MQI client. STRMQTRC and ENDMQTRC programs can be used to enable and disable the trace.

Example for start trace:

CALL PGM(QMQM/STRMQTRC) PARM('-e' '-t' 'all' '-t' 'detail')
Where -e option requests early tracing of all the process -t option for trace type

To end the trace

CALL PGM(QMQM/ENDMQTRC) PARM('-e')

• Optional parameters:

  -t TraceType

  The points to trace and the amount of trace detail to record. By default all trace points are enabled and a default-detail trace is generated.

  Alternatively, we can supply one or more of the options in Table 1. For each TraceType value you specify, including -t all, specify either -t parms or -t detail to obtain the appropriate level of trace detail. If we do not specify either -t parms or -t detail for any particular trace type, only a default-detail trace is generated for that trace type.

  If you supply multiple trace types, each must have its own -t flag. We can include any number of -t flags, if each has a valid trace type associated with it.

  It is not an error to specify the same trace type on multiple -t flags.

  See the following table for allowed values for TraceType.

  Table 1. TraceType values

  Value	Description
  all	Output data for every trace point in the system (the default). Using all activates tracing at default detail level.
  api	Output data for trace points associated with the message queue interface (MQI) and major queue manager components.
  commentary	Output data for trace points associated with comments in the IBM MQ components.
  comms	Output data for trace points associated with data flowing over communications networks.
  csdata	Output data for trace points associated with internal data buffers in common services.
  csflows	Output data for trace points associated with processing flow in common services.
  detail	Activate tracing at high-detail level for flow processing trace points.
  lqmdata	Output data for trace points associated with internal data buffers in the local queue manager.
  lqmflows	Output data for trace points associated with processing flow in the local queue manager.
  otherdata	Output data for trace points associated with internal data buffers in other components.
  otherflows	Output data for trace points associated with processing flow in other components.
  parms	Activate tracing at default-detail level for flow processing trace points.
  remotedata	Output data for trace points associated with internal data buffers in the communications component.
  remoteflows	Output data for trace points associated with processing flow in the communications component.
  servicedata	Output data for trace points associated with internal data buffers in the service component.
  serviceflows	Output data for trace points associated with processing flow in the service component.
  versiondata	Output data for trace points associated with the version of IBM MQ running.

  -x TraceType

  The points not to trace. By default all trace points are enabled and a default-detail trace is generated. The TraceType values we can specify are the same as the values listed for the -t flag in Table 1.

  We can use the -x flag with TraceType values to exclude those trace points we do not want to record. Excluding specified trace points is useful in reducing the amount of trace produced.

  If you supply multiple trace types, each must have its own -x flag. We can include any number of -x flags, if each has a valid TraceType associated with it.

  -s

  Reports the tracing options that are currently in effect. You must use this parameter on its own with no other parameters.

  A limited number of slots are available for storing trace commands. When all slots are in use, then no more trace commands can be accepted unless they replace an existing slot. Slot numbers are not fixed, so if the command in slot number 0 is removed, for example by an endmqtrc command, then all the other slots move up, with slot 1 becoming slot 0, for example. An asterisk (*) in a field means that no value is defined, and is equivalent to the asterisk wildcard.

  -l MaxSize

  The maximum size of a trace file ( AMQppppp.qq.TRC ) in megabytes (MB). For example, if you specify a MaxSize of 1, the size of the trace is limited to 1 MB.

  When a trace file reaches the specified maximum, it is renamed to AMQppppp.qq.TRS and a new AMQppppp.qq.TRC file is started. If a previous copy of an AMQppppp.qq.TRS file exists, it is deleted.

  The highest value that MaxSize can be is 2048 MB.

  -e

  Requests early tracing of all processes

  For more details see the strmqtrc command

• To end the trace:

  /QSYS.LIB/QMQM.LIB/ENDMQTRC.PGM [-e] [-a]
  

  where:

  -e

  Ends early tracing of all processes.

  Use endmqtrc with no parameters has the same effect as endmqtrc -e. We cannot specify the -e flag with the -m flag, the -i flag, or the -p flag.

  -a

  Ends all tracing.

  For more details see the endmqtrc endmqtrc command

• To display a formatted trace file:

  /QSYS.LIB/QMQM.LIB/DSPMQTRC.pgm
  

To examine First Failure Support Technology ( FFST ) files, see FFST: IBM MQ for IBM i.