the_tags never caches

[luke83]

this is what i get every time there is a call to the_tags function:

SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (__POST_ID__) ORDER BY t.name ASC

Of course one query each post! D'oh!

If the posts in question weren't fetched with get_posts() then that will happen. Posts fetched with get_posts() will call update_object_term_cache() so that taxonomy for all posts can be retrieved with one query.

Replying to ryan:

If the posts in question weren't fetched with get_posts() then that will happen. Posts fetched with get_posts() will call update_object_term_cache() so that taxonomy for all posts can be retrieved with one query.

Hi ryan,
i have a fresh wp install with only WP File Cache plugin to handle caching, i'm a bit confused, in my home i got this (you can see it uses get_posts()):

12 queries
1.  SELECT SQL_CALC_FOUND_ROWS  wp_posts.* FROM wp_posts  WHERE 1=1  AND wp_posts.post_type = 'post' AND (wp_posts.post_status = 'publish' OR wp_posts.post_status = 'private')  ORDER BY wp_posts.post_date DESC LIMIT 0, 10 [0.0012137889862061]
   require, wp, WP->main, WP->query_posts, WP_Query->query, WP_Query->get_posts
2. SELECT FOUND_ROWS() [0.0011308193206787]
   require, wp, WP->main, WP->query_posts, WP_Query->query, WP_Query->get_posts
3. SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (141) ORDER BY t.name ASC [0.014594078063965]
   require, require_once, include, get_template_part, locate_template, load_template, require, post_class, get_post_class, get_the_tags, get_the_terms, wp_get_object_terms
4. SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (141) ORDER BY t.name ASC [0.018500804901123]
   require, require_once, include, get_template_part, locate_template, load_template, require, get_the_tag_list, get_the_term_list, get_the_terms, wp_get_object_terms
5. SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (140) ORDER BY t.name ASC [0.0010030269622803]
   require, require_once, include, get_template_part, locate_template, load_template, require, post_class, get_post_class, get_the_tags, get_the_terms, wp_get_object_terms
6. SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (140) ORDER BY t.name ASC [0.00054287910461426]
   require, require_once, include, get_template_part, locate_template, load_template, require, get_the_tag_list, get_the_term_list, get_the_terms, wp_get_object_terms
7. SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (139) ORDER BY t.name ASC [0.00051283836364746]
   require, require_once, include, get_template_part, locate_template, load_template, require, post_class, get_post_class, get_the_tags, get_the_terms, wp_get_object_terms
8. SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (139) ORDER BY t.name ASC [0.00049591064453125]
   require, require_once, include, get_template_part, locate_template, load_template, require, get_the_tag_list, get_the_term_list, get_the_terms, wp_get_object_terms
9. SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (105) ORDER BY t.name ASC [0.00055694580078125]
   require, require_once, include, get_template_part, locate_template, load_template, require, post_class, get_post_class, get_the_tags, get_the_terms, wp_get_object_terms
10. SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (105) ORDER BY t.name ASC [0.0008690357208252]
   require, require_once, include, get_template_part, locate_template, load_template, require, get_the_tag_list, get_the_term_list, get_the_terms, wp_get_object_terms
11. SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (1) ORDER BY t.name ASC [0.00066900253295898]
   require, require_once, include, get_template_part, locate_template, load_template, require, post_class, get_post_class, get_the_tags, get_the_terms, wp_get_object_terms
12. SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (1) ORDER BY t.name ASC [0.00062394142150879]
   require, require_once, include, get_template_part, locate_template, load_template, require, get_the_tag_list, get_the_term_list, get_the_terms, wp_get_object_terms

is there something i can check or some plugin i can use to fix it?

the_tags don't cache also in wordpress 3.0.1 as reported above..

But they do. So you have something else going on.

Hi guys,
I´ve having a simular issue.
MySQL is giving slow queries like these:

# Sat Dec  4 13:07:33 2010
# Query_time: 2.471577  Lock_time: 0.061732 Rows_sent: 4  Rows_examined: 22
use espaland_wrd3;
SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (1878) ORDER BY t.name ASC

# Sat Dec  4 13:07:39 2010
# Query_time: 2.743471  Lock_time: 0.051083 Rows_sent: 1  Rows_examined: 9
use espaland_wrd3;
SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('category') AND tr.object_id IN (1718) ORDER BY t.name ASC

blueHost is CPU throttling my account becasue of few bunch of queries like that.

Please try the support forums: ​http://wordpress.org/support/

Code somewhere is doing something wrong.