AW: [PHP-DB] Performance in MySQL Result Question
thx folks, I pretty much thought version 1 to be the best. I' wouldn't have known how to carry the result to other pages anyway. Jan Hi, I've got a page with lot's of visitors every day and I sure hope to get more, so I'm already thinking of performance. This is what I've got. Users select one or more things out of a couple drop down menus, no big deal. Their selection is than shown, with a limitation of 20 results on the page. Now comes my question, what is better speaking of performance: When users go on to the next page, is it better to provide the select statement again with a different integer for the limit? Or is better to do a full select without a limitation on first page. But than I don't know how to provide the result set for the next, next, ... page? What would be your choice? I'm open to suggestions, maybe somebody has a totally different idea. The limitation of 20 is a wish of my customer. I think, most vistors won't stay on page one, but will click thru some pages further. The max. number of results shown should be around 1000 hits. Jan -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Performance in MySQL Result Question
I know what you are trying to get at. A full select and a select with limit have the same query speed, but the full select has to transfer all of the selected data, where as a limit only transfers the number of records specified. The more records that match a search, the faster your limit select will be in relation to a full select. As for improving performance, you would like to avoid re-executing a complex query just to get the next set of records. If you are using MySQL 4 with query caching enabled you don't have to worry. MySQL will be smart enough to cache the query result and won't rerun the exact same query on the database if no data has changed. On Saturday, March 15, 2003, at 03:57 AM, Jan Bro wrote: Now comes my question, what is better speaking of performance: When users go on to the next page, is it better to provide the select statement again with a different integer for the limit? Or is better to do a full select without a limitation on first page. But than I don't know how to provide the result set for the next, next, ... page? -- Brent Baisley Systems Architect Landover Associates, Inc. Search Advisory Services for Advanced Technology Environments p: 212.759.6400/800.759.0577 -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] Performance in MySQL Result Question
Hi, I've got a page with lot's of visitors every day and I sure hope to get more, so I'm already thinking of performance. This is what I've got. Users select one or more things out of a couple drop down menus, no big deal. Their selection is than shown, with a limitation of 20 results on the page. Now comes my question, what is better speaking of performance: When users go on to the next page, is it better to provide the select statement again with a different integer for the limit? Or is better to do a full select without a limitation on first page. But than I don't know how to provide the result set for the next, next, ... page? What would be your choice? I'm open to suggestions, maybe somebody has a totally different idea. The limitation of 20 is a wish of my customer. I think, most vistors won't stay on page one, but will click thru some pages further. The max. number of results shown should be around 1000 hits. Jan -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] Performance in MySQL Result Question
[snip] Now comes my question, what is better speaking of performance: When users go on to the next page, is it better to provide the select statement again with a different integer for the limit? Or is better to do a full select without a limitation on first page. But than I don't know how to provide the result set for the next, next, ... page? [snip] Use a limit, it's efficient. You can't do a full select on one page and somehow carry the result over to another page with any kind of efficiency. ---John W. Holmes... PHP Architect - A monthly magazine for PHP Professionals. Get your copy today. http://www.phparch.com/ -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
