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       BUGS
       bless is not supported on shared references. In the current 
...
       error message. But the $hashref->{key} is not shared, causing 
       the error "locking can only be used on shared values" to occur
       when you attempt to lock $hasref->{key}.

       Threads and Thread Safety

...
       Using DBI with perl threads is not yet recommended for producti
+on envi-
       ronments. For more information see <http://www.perl-
       monks.org/index.pl?node_id=288022>