database - MySQL: UPDATE too slow -


the following benchmark of series of queries have run. can see, updates slower other queries. what can speed them up?

0.0002  lock table category write;  0.0004           select             @myleft := left_id                     category                     `amazon_browse_node_id` = 2675;  0.0184  update category set right_id = right_id + 2 right_id > @myleft;  0.0161  update category set left_id = left_id + 2 left_id > @myleft;  0.0007  insert category(`name`, `amazon_browse_node_id`, `category_seo_friendly_url`, `left_id`, `right_id`) values('training', 2697, 'training-2697/', @myleft + 1, @myleft + 2);  0.0004  unlock tables;

this problem related following problems (and attempt @ solution), posted here in so:

  1. mysql: nested set slow?
  2. mysql trigger in order cache results?

update:

create table if not exists `category`   (      `category_id`               int(11) not null auto_increment,      `name`                      char(255) default null,      `category_seo_friendly_url` char(255) default null,      `left_id`                   int(11) default '1',      `right_id`                  int(11) default '2',      primary key (`category_id`),      unique key `seo_friendly_url_unique` (`category_seo_friendly_url`),      key `category_id` (`category_id`),      key `left_id` (`left_id`),      key `right_id` (`right_id`)   )

the thing proper keys on right_id , left_id. then, updates slower selects or inserts. there not lot can it.


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