perldoc DBI:

   "finish"
      $rc  = $sth->finish;


    Indicate that no more data will be fetched from this statement han
+dle
    before it is either executed again or destroyed. You almost certai
+nly do
    *not* need to call this method.

    Adding calls to "finish" after loop that fetches all rows is a com
+mon
    mistake, don't do it, it can mask genuine problems like uncaught f
+etch
    errors.
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