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.

Airtable WordPress plugin development- Integrate with airtable API
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Shortcode How to add a shortcode which runs a .php file for the current post
How to add a shortcode which runs a .php file for the current post
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