How do I know when Google has visited my site? Is there something in my weblogs I can look for to determine that a Google spider has been at my website?
Yes there'll be a reference to Googlebot in your weblog. eg. ***.68.82.142 - - [20/Jun/2004:14:48:14 -0400] "GET /robots.txt HTTP/1.0" 200 51 "-" "Googlebot/2.1 (+http://www.googlebot.com/bot.html)"
You can specify the frequency of visits either in your robots.txt or in the meta tags. The more links and content you have, the more frequently the googlebot will visit.
Sorry but I don't think so. The revisit tag is a bit outdated... Good site good content good links = positioning = G Y M etc come daily M
Frequency in bots file ? I think thats a fooboo. You can allow/disallow, but that's about it. Of course the bots meta is another thing entirely.. If you have access to php/mysql, and your site isn't too large, you might consider robotstats (http://www.robotstats.com/en/). It covers a tidy array of bots. If you prefer perl, consider Relax (http://ktmatu.com/software/relax/) to post process your server logs. It generates reports etc on which search engines have visited (it recognizes over 500) popular keywords, etc. It even eats WebStar logs (for the dated Macmasters among us) - it's highly configurable