What’s new with tracing?
 
 
- Trace level now split into trace level (0-15) and trace topics
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- DBI and drivers can define named trace topics
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- New $h->parse_trace_flags("foo|SQL|7")method
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- map trace topic names into the corresponding trace flag bits.
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- Added automatic calling of parse_trace_flags()
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- if setting the trace level to a non-numeric value:
$h->{TraceLevel} = "foo|SQL|7";
 
 DBI->connect("dbi:Driver(TraceLevel=SQL|bar):...", ...);
 DBI_TRACE = "foo|SQL|7|baz" # environment variable
 
 
 
- Currently no trace topics have been defined.