为大量 post 元优化 WP 元查询？

Question

我有一个大型 WP 站点，其中包含大约 2k 个帖子和 150k 个 postmeta。当浏览到一个大类别时，存档加载非常慢，因为 WP 查询正在寻找特色帖子，首先显示它们。我知道最终目标是优化 postmeta table，但现在我想知道是否有任何可能的方法来优化下面的元查询（一个在底部）。

我进行了一些调试（参见 //comments），发现 'compare' => '!=' 导致查询变得非常慢。我还发现 '' 或 '<' 大大加快了查询速度，结果相同，但我不确定这是否是正确的方法。如果有办法加快此查询，请告诉我。谢谢

function appthemes_addon_on_top_query( $wp_query ){

    $addon_type = $wp_query->get( 'addon_on_top' );

    if( ! $addon_type || ! appthemes_addon_exists( $addon_type ) ) {
        return;
    }

    $addon_info = appthemes_get_addon_info( $addon_type );
    $flag_key   = $addon_info['flag_key']; //custom field for featured posts
    $meta_query = (array) $wp_query->get( 'meta_value', 1 );
    $meta_query = array_filter( $meta_query );
    $meta_query[] = array(
        'relation' => 'OR',
        array(
            'key'     => $flag_key,
            'compare' => 'NOT EXISTS',
        ),
        array(
            'relation' => 'OR',
            //Deleting the array below makes the query quick, but i need it to show featured posts first
            array(
                'key'   => $flag_key,
                'value' => 1,
            ),
            //Deleting the array below makes the query quick, but i need it to properly sorting the posts by date (see below: $wp_query->set( 'orderby')
            array(
                'key'     => $flag_key,
                'value'   => 1,
                'compare' => '!=', //It is about this comparison. '' or '<' makes the query quick, but i am not sure if that is a proper replacement. Also not sure why '!=' makes it this slow.
            ),
        ),
    );

    $wp_query->set( 'meta_query', $meta_query );
    $wp_query->set( 'orderby', array( 'meta_value' => 'DESC', 'date' => 'DESC' ) );
}

Answer 1

好的，我发现 'compare' => '!=' 会减慢速度，但 'compare' => '<>' 不会。我猜两者是一样的，所以我想这个问题已经解决了。

为大量 post 元优化 WP 元查询？

Optimize WP Meta Query for large amount of post meta?

wordpress

metadata