Enabling tracing
Per handle
$h->trace($level);
$h->trace($level, $filename);
- Only effects that handle and any new child handles created from it
- Child handles get trace level of parent in effect at time of creation
Global (internal to application)
- Sets effective global default minimum trace level
Global (external to application)
- Enabled using DBI_TRACE environment variable
DBI_TRACE=digits DBI->trace(digits);
DBI_TRACE=filename DBI->trace(2, filename);
DBI_TRACE=digits=filename DBI->trace(digits, filename);