Upon initiation of the Oracle Exchange (execution of the prextr_orc.exe)
using either the GUI or batch process, a check is made to see if the trace
log, ScanOrc.log, exists in the installation directory. If it does not exist,
it is created and following two records are written to the file.
hh:mm.ss|zOS Exchange for Oracle log
hh:mm.ss|Log date mm/dd/yyyy
If the log file exists, the above records are appended to the ScanOrc.log
every time the Oracle Exchange is initiated.
Using the CA Repository Exchange for Oracle GUI you will need to set the
desired trace option prior to opening the data source (File -> Open
Datasource...). Select Edit -> Trace. Then select the desired trace level.

The available trace options and description of these options are as follows:
O - trace off - default value. No trace records are written. Only the zOS
Exchange for Oracle Log and date/time records are recorded each time the
Oracle Exchange is initiated.
L - Low - If set to low, scanner writes only most important messages to trace
file. E.g. Errors
M - Medium - If set to medium, in addition to messages written at Low level,
scanner writes messages which help in diagnosis in case of failure or
error.
H - High - If set to high, scanner writes messages which help in diagnosis in
case of failure or error. This similar to medium but it writes
additional information. This is the highest level and scanner writes
every message to log file.
Using command line interface, the trace value is specified using the -t parameter at the very end of the input string.

-t= O - OFF
L - LOW
M - MED
H - HIGH
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In the above example, -t= would be added after the -x= input parameter.
Valid values for using the -t parameter are:
-t=O (OFF)
-t=L (LOW)
-t=M (MED)
-t=H (HIGH)