Comment on WordPress Plugins to monitor and debug WP enabled plugins – Find Errors / Warnings and Remove WP problematic plugins slowing down your Website (blog) database by Lorenz.
SOLUTION: Disable only the "Automatic interlinking" feature of the "SEO Smart Links" plugin.
It solves the problem of this kind of query:
"SELECT DISTINCT post_title, ID, post_type, post_name FROM wp_posts wposts […] post_status = 'publish' AND LENGTH(post_title)>=5 ORDER BY LENGTH(post_title) ASC LIMIT 500"
as you can see "5" is the default value of "Minimum length in characters for term to be considered for autolinking" and "500" is the default value of "Check limit;" in the options page.
Cheers!!
Lorenz
