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Google doesm't really like them
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Google doesn't like or dislike anything, it isn't a human being it's a piece of software.
There are things it can handle easily and some things that it doesn't.
Dynamic links cause the crawl rate to be slowed because there can be an issue where the database could be overrun with queries from spiders alone.
Even URIs with more than 3 querystring parameters can and do get crawled if the site is "important" enough according to the algo criteria. What causes an issue more than anything is having a page that is reached with a parameter eg "category.asp?cat=1234" and the links going off that page are also "dynamic" eg "product.asp?prod=6789" in this case product.asp is unlikely to be crawled without other links from a static page (eg a sitemap) or an alternative external routes (deep links) pointing to it.
BTW this is not some random information based on guesswork, this is tried and tested by myself over several years of working with "dynamic" and database driven sites and the search engines. Including coding my own SE for a company intranet and a limited number of external sites and the problems that needed to be overcome there.
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Chris. ->> Links are advertising NOT optimising!! <<-
A foolish consistency is the hobgoblin of little minds
Thought for today:- I SEO the only industry where all the cowboys are Indians?
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