Make WordPress Core

Opened 7 months ago

Last modified 7 months ago

#52759 new feature request

Add a filter to get_available_post_mime_types() function to allow overriding extremely slow query.

Reported by: maciejmackowiak Owned by:
Milestone: Awaiting Review Priority: normal
Severity: normal Version:
Component: Media Keywords: good-first-bug has-patch
Focuses: performance Cc:


On sites sites with lot of posts the query used in get_available_post_mime_types is extremely slow.
It would be nice to have a filter that will allow us to override this query and for example cache the results.

It could be something simillar to this filter:

function get_available_post_mime_types($type = 'attachment') {
        global $wpdb;
        $types = apply_filters('get_available_post_mime_types', null, $type);
        if ( ! is_array( $types ) ) {
                $types = $wpdb->get_col($wpdb->prepare( "SELECT DISTINCT post_mime_type FROM $wpdb->posts WHERE post_type = %s", $type ) );
        return $types;

Change History (9)

#1 @johnbillion
7 months ago

  • Component changed from General to Media
  • Focuses performance added
  • Keywords needs-patch good-first-bug added

#2 @archon810
7 months ago

+1 for this.

For us, it adds an additional 0.35s or so (right now, more if db is loaded).

FROM wp_posts
WHERE post_type = 'attachment'
> OK
> Time: 0.35s

On the grid view it is called from here:

It calls this function:

And here is the query:

We were able to cache and greatly speed up this query already:

SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month
FROM wp_posts
WHERE post_type = 'attachment'
AND post_status != 'auto-draft'
AND post_status != 'trash'
ORDER BY post_date DESC

and I hope with the new proposed filter, we will be able to speed up the site even more.

This ticket was mentioned in PR #1088 on WordPress/wordpress-develop by maciejmackowiak.

7 months ago

  • Keywords has-patch added; needs-patch removed

This ticket was mentioned in Slack in #core-media by antpb. View the logs.

7 months ago

#6 @Mista-Flo
7 months ago

Hi there,

I'm definitely for a filter to short circuit this slow query, but I think first we need to fix this slow query by implementing a cache, wether it use the internal cache API system from Core or the Transient API, (check the slack thread we started for further comments).

Related tickets talking about the performance issues of this query: https://core.trac.wordpress.org/ticket/43658

Last edited 7 months ago by Mista-Flo (previous) (diff)

#7 @archon810
7 months ago

Great idea 💡.

#8 @maciejmackowiak
7 months ago

check the slack thread we started for further comments

Can you point me to that thread, please?

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