2012
07.24

WordPress: a little bottleneck around adjacent posts

Category: Bugfix / Tag: , ,  / Add Comment

Today I’ve searched through MySQL slow query log, and found some intresting log entries, like this:

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# Time: 120724 12:10:12
# User@Host: user[db] @ localhost []
# Query_time: 1.539405  Lock_time: 0.000140 Rows_sent: 1  Rows_examined: 15162
use db;
SET timestamp=1343124612;
SELECT p.* FROM wp_posts AS p  WHERE p.post_date < '2012-07-06 17:42:00' AND p.post_type = 'post' AND p.post_status = 'publish'  ORDER BY p.post_date DESC LIMIT 1;

So this one tiny query took 1.5 seconds? What is this? It is essential for my site?

When I dig a bit deeper into WordPress I’ve find out, that this query is generated in link-template.php by the get_adjacent_post function.

This creates the nice links in the header like:

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<link rel='next' title='Newest post' href='http://djzone.im/newest-post/' />
<link rel='prev' title='Oldest post' href='http://djzone.im/oldest-post/' />

Because we generate sitemaps regulary, this feature is useless for me.
So I’ve decided to turn this off, this way:

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remove_action('wp_head','adjacent_posts_rel_link_wp_head', 10, 0 );

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