Logging parameters
log_filename - Name (and path name) of the logging-file
This parameter specifies the location of a file to which the log output will be written.
log4jpropertyfilename
The name of the log4j property file.
verbose - the debug message granularity
The verbose parameter specifies the intensity of log entries.
A value between 1 and 9 can be specified. Higher values cause more detailed information to be logged.
Log output is written to stdout or to a file that has been specified with the log_filename parameter.
This parameter is optional.