Disadvantage of dynamically created pages

Many search engines like Google for example don't like dynamically created pages because the crawlers might get in an infinite loop on your server if they follow dynamically created web pages with a query string in it. The spider can be trapped in the web server - and therefore the spiders and bots are very careful not to enter the web site too deep.
Dynamic generated URL's with a large number of parameters "?&id=" can therefore cause problems for search engine bots. This is why we normally recommend to use a seo rewriting program to change dynamic URL's into Google-friendly URL's. This is always a good step to start with, when you hire a SEO company.
If you can, keep the number of URL parameters to one or two it may help so that search engines can crawl your dynamic web pages.
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