Could

Can I split a huge wp_postmeta table across different databases or servers?

Can I split a huge wp_postmeta table across different databases or servers?

No. This is not practically possible primarily because there is no single interface to this table where you could implement the functionality you need, and even if you could, it would introduce some extremely gnarly problems.

Permalink Wordpress Permalink Issue for media permalink leading to 404 page when set as postname
Wordpress Permalink Issue for media permalink leading to 404 page when set as postname
How do I fix a permalink issue in WordPress? How do I change the media Permalink in WordPress? How do I change permalinks in WordPress without breakin...
Media How to copy the all Wordpress media items to another custom plugin folder?
How to copy the all Wordpress media items to another custom plugin folder?
How do I download my entire WordPress media library? Can you organize media in WordPress? Can you create folders in WordPress media library? How do I ...
Redirect What does WordPress uses to redirect users from one url to another?
What does WordPress uses to redirect users from one url to another?
Redirection The simplest way to add and manage redirects in WordPress is by using the Redirection plugin. Install and activate the plugin. ... You can...