VISION_LOGGING_LEVEL

Set this variable to a value between 1 and 9 to initiate Vision logging/tracing; the higher the number, the more detailed the trace file. The trace file contains all Vision file operations performed at runtime, such as file opens, reads, and writes. It is useful for troubleshooting file errors. By default, the file is named vision_trace.log.

A value of 0 or -1 turns file tracing off.