Just some side notes:
- Trace levels 1 and 2 are reserved for the DBI itself
- The DBI itself only features levels 1..15, but the underlying DBD might support up to whatever they like. I think I saw one that took all over 100 to be special, but my recollection might be troubled.
- Some DBD's support additional trace flags
(all that from the documentation, they might have undocumented debugging flags)
- Not all of the trace messages come from DBI itself, so check the DBD you use if they have additional documentation
Enjoy, Have FUN! H.Merijn