[errlog]
debug_keep_file=0
If 0, the current DEBUG.OUT is renamed DEBUG.BAK,deleting any old DEBUG.BAK first, when it reaches the maximum size and a new debug file is created.
If 1, the current DEBUG.OUT is renamed DEBUG.000, DEBUG.001 etc, when it reaches the maximum size, but only if a line containing the word ERROR has been printed since DP4 was loaded.