Improving performance of meta_form()
|Reported by:||lumaraf||Owned by:|
Description (last modified by SergeyBiryukov)
The query executed in meta_form() in wp-admin/includes/template.php took over 5 seconds to execute on my largest wordpress installation. I changed it to use a NOT BETWEEN to enable MySQL to execute the query by just using a small part of the meta_key index. My new query executes in less than 10 milliseconds.
Here is the improved query:
SELECT DISTINCT meta_key FROM wp_postmeta WHERE meta_key NOT BETWEEN '_' AND '_z' HAVING meta_key NOT LIKE '\_%' ORDER BY meta_key