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From:Rob Wultsch Date:April 28 2008 4:44pm
Subject:Re: Optimizing table (shall I create a primary field?)
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On Mon, Apr 28, 2008 at 6:49 AM, Rob Wultsch <wultsch@stripped> wrote:
> I am going to assume that you are asking this question because
>  performance has not improved from this change. Is this correct?
>
>  I don't think that your surogate key (id) is useful, but that is
>  probably minor. I think that your hostings company suggestion is
>  probably a good idea, but will also probably not impact performance. A
>  prymary key is basically only a unique not null key, and it sounds
>  like your isbn field should have those properties.
>
>  >key_len=302
>  This is pretty horrible. If I needed better performance I would try to
>  turn the isbn field into a bigint (the dashes are the only non-numeric
>  characters and have no significance, right?). That would start with
>  something like:
>  ALTER TABLE `books` ADD `new_isbn` BIGINT NOT NULL ;
>  UPDATE `books` SET `new_isbn` = replace(`isbn`,'-','');
>  ...
>  though that may require significant changes in your app (converting
>  the string into an int) but a stored procedure might make this
>  somewhat less painful.
>
>  What are your goals here?

For the record: if performance is good enough I wouldn't change anything...

-- 
Rob Wultsch
wultsch@stripped
wultsch (aim)
Thread
Optimizing table (shall I create a primary field?)Charles Lambach27 Apr
  • Re: Optimizing table (shall I create a primary field?)Rob Wultsch27 Apr
    • Re: Optimizing table (shall I create a primary field?)Charles Lambach28 Apr
      • Re: Optimizing table (shall I create a primary field?)Rob Wultsch28 Apr
        • Re: Optimizing table (shall I create a primary field?)Rob Wultsch28 Apr
          • Re: Optimizing table (shall I create a primary field?)Wm Mussatto28 Apr
            • Re: Optimizing table (shall I create a primary field?)Charles Lambach29 Apr
              • Re: Optimizing table (shall I create a primary field?)Rob Wultsch29 Apr
  • Re: Optimizing table (shall I create a primary field?)Sebastian Mendel30 Apr