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# Ask for errors at database handle creation
my $dbh2 = DBI->connect(
...

# Or check your method call
$dbh2->do($sql) or die "Cannot execute SQL '$sql': $DBI::errstr;

  $dbh2->do(
    qq{alter session set nls_timestamp_format = 'YYYY-MM-DD HH24:MI:SS
+'}
  ) or die "Can't set timestamp format: $DBI::errstr";