I think getting the sql is driver specific, but try adding $db->errstr: 

unless ($db->do($update_meta_sql, undef, $updates, $run_id)) {
    $status = "failed at  update runmeta: ". $db->errstr;
}

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In reply to Re: getting the sql executed from a parameterised statement by wallisds
in thread getting the sql executed from a parameterised statement by Anonymous Monk

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