Should I create a slug on the fly or store in DB?

Question

A slug is part of a URL that describes or titles a page and is usually keyword rich for that page improving SEO. e.g. In this URL PHP/JS - Create thumbnails on the fly or st

Answer 1

For slug generation I don't think that generation time should be an issue, unless your slug algorithm is insanely complicated! Similarly, storage space won't be an issue.

I would store the slug in the database for the simple reason that slugs usually form part of a permalink and once a permalink is out in the wild it should be considered immutable. Having the ability to change a slug for published data seems like a bad idea.