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$sth = $dbh->prepare ($sql);
# im doing a mysql restart
$sth->execute (); # DBD::mysql magically reconnects keeping the prepar
+ed statement and executes

$sth= $dbh->prepare ($sql);
# stoping mysql
$sth->execute (); # DBD::mysql tries, but no connection, reconnecting 
+and trying again will lose the $dbh->prepare

$sth= $dbh->prepare ($sql);
# stoping mysql
...
sleep 5; 
MyDBI->connect_like_mysql_reconnects;
}