1.7.2 About analysis and execution trace files
The default is that the analysis and execution trace files output error information that is generated during script execution. You can set the execution environment so that no trace files are output. However, if you do so you may not be able to identify the causes of errors, because the statements and the command errors that may occur during script execution are not output. It is recommended that you output trace files if at all possible. However, if you specify output of a detailed execution trace file#, execution performance of script files will be adversely affected because the amount of output information will increase.
If you choose not to output trace files, you should create scripts that take into account error handling, such as by checking each command's execution results and identifying the causes of errors by saving to a file the names of erroneous commands and the contents of _RTN_ reserved variables.
#: For details about the output levels of the execution trace file, see 4.1.12 Set Command Line dialog box or 6.2.2(3) /SPXLV(n) (or /spxlv(n)).