I'm new to the whole SEO scene so I may have the wrong end of the stick. Now I am under the impression that search engines re-index your website when they notice a change in content.
So with dynamic sites with a database that is updated daily, the site would have slight changes throughout its pages on a daily basis - So would they also be spidered on a regular basis under the impression that all new content is available?
The more popular your site (higher PR), the more often your site will be checked for changes (crawled). Check the Google cache to see when your site was last crawled.
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