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.

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Oembed oEmbed in wordpress multisite not working
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Attachment How can i set media attachments to the author of the post or page for already existed posts with attachments
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