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Error ORA-12545: Connect failed because target host or object does not
+ exist (DBD ERROR: OCIServerAttach) connecting to DBI:Oracle:host=<ho
+stname>;sid=<sid>;port=1521

# DBI Initializations
...
my $dbh = DBI->connect($dsn,$user,$password) or croak "Error $DBI::err
+str connecting to $dsn\n";