I have a URL likeAbc.com/viewpage?id=1234-4655-7678;type=articleHow do search engines like Google or Bing determine during crawling the value of these parameters?The id is globally unique (GUID). Is this a problem and should I change the format or URL?
How search engines determine the query string values for dynamic pages?
seo;google;html
Search engines will only find the query string values that they are directed to.  They may find these URLs through several mechanisms:The main way is through links.   Links like this one one of your pages will cause the bots to crawl the pages with the specified IDs:<a href=/viewpage?id=1234-4655-7678;type=article>Article A</a><a href=/viewpage?id=1234-4655-7679;type=article>Article B</a>If you publish an XML sitemap then search engine bots will crawl the URLs listed within:<?xml version=1.0 encoding=UTF-8?><urlset xmlns=http://www.sitemaps.org/schemas/sitemap/0.9>    <url><loc>http://abc.com/viewpage?id=1234-4655-7678;type=article</loc></url>    <url><loc>http://abc.com/viewpage?id=1234-4655-7679;type=article</loc></url></urlset>Some bots will submit forms on your site.  So if you had a form like this, the pages might be discoverable:        <form method=GET action=viewpage>    <select name=id>        <option value=1234-4655-7678;type=article>Article A</option>        <option value=1234-4655-7679;type=article>Article B</option>    </select></form>Using IDs in URLs is very common.  It is not a huge problem for search engines as long as you can provide a mechanism for the URLs to be discovered.You don't want to use IDs in your URLs that change frequently (such as user session IDs.)