Shawn, Thank you very much for your tips. Iīll do that.
Ronan ----- Original Message ----- From: <[EMAIL PROTECTED]> To: "Ronan Lucio" <[EMAIL PROTECTED]> Cc: <mysql@lists.mysql.com> Sent: Tuesday, January 18, 2005 6:36 PM Subject: Re: Doubt about Performance "Ronan Lucio" <[EMAIL PROTECTED]> wrote on 01/18/2005 02:53:39 PM: > Shawn, > > Your tips are realy good but I canīt use cache neither for > queries nor for pages because our site serves hundreds of > clients, each one with your own code make a different > query, returning different rows. > > It would be too many queries to be cached. > I know I didnīt say it in the previous message. > > Thank you for the help, > Ronan > > You would run your "queries" against your cached data using your web site's application code. You can create additional arrays to act as indexes against the data so that you will not need to do a full "array scan" every time. Load your data into your arrays in the order of the "customer" parameter, then you have already isolated each customer's data to a contiguous portion of the data array. Trust me, if you do it right (sorted and "indexed" data + fast lookup routine), it should be 10-20 times faster than trying to read through the same data from the database each and every time ([array search + array seek + looped scan] instead of [SQL parsing + query processing + net lag + data transfer time]). I do not recommend doing this to every page on your site, only to those pages that handle the highest traffic and only for data that doesn't change quickly (on the order of several changes per hour or per day, not several changes per second). For rapidly changing data, data you don't need often, or unpredictable queries, read the data from the database. It saves you no time to take the effort to cache that kind of data. Shawn Green Database Administrator Unimin Corporation - Spruce Pine -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
