Trace Output

       Initially trace output is written to "STDERR".  Both the "$h->t
+race"
       and "DBI->trace" methods take an optional $trace_filename param
+eter. If
       specified, and can be opened in append mode, then all trace out
+put
       (currently including that from other handles) is redirected to 
+that
       file.  A warning is generated if the file can't be opened.
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