URL rewrite, Google penalty?

If I do a URL rewrite and all of the sudden my website goes from 200 pages to 20,000, is Google likely to penalize that? Does anyone have experience with that?

Thank you in advance for all of your help and experience.

Google likes sites with a large number of pages.

I have recently done mod rewrites to a well-ranking site of mine and it increased my Google referrals a LOT. I get much more traffic from Google for targeted searches.

Advice: do it.

how would you know if google refers your site? i find it hard to index my new site in google

Web stats tell you how many hits you're getting from Google.

To get indexed by Google, get a link to your site on a site that's already indexed by Google.

URL rewriting is considered as spam by Google. But in my view it is someting like "CLOAKING". So there is better possibility to consider it as spam by Google in the coming updates. Any way I expect that. Do you agree?

That is simply BS! ...

a rewrite rule merely replaces url characters for a different set of characters.

You can assume by the original question that the website isn't getting crawled as well as it could possibly because of dynamic references.

Your idea of CLOAKING is pure rubbish [cloaking is serving different content to a search engine user agent than to a broswer user agent] With a mod rewrite "ALL" user agents get the identical information.

Yep, gotta agree with Fathom here and disagree with Anessh.

Rewritting URLs is certainly not spam. And Google couldn't penalise for it because it would never know. This is all handeled server side in response to a request froma client (googlebot in this instance). It would never know the page it got wasn't the one at that URL.

To illustrate, imagine a large database driven site with several parameters in the URL that is several directories deep.

http://www.your-long-domain-name.com/another-long-directory/-just-one-more-for-goor-measure/long-file-name.php?timeofday=now&catid=23353580&prodid=9539797978&seshid=8938593-tn3fhj-93hg-39u-gj33=jg=j=vj-3jg?anotherparemter=forgoodeasure

This looks uggly, and would probably not get indexed very well. It would be much better rewritten which is why so many ecommerce sites use a mod_rewrite.

But for URL rewriting, our site needs to be hosted with python server. Otherwise not possible in my knowledge.

You really don't know what are you talking about...

Yes. I agree I was wrong. But what abt python server.

We have done URL rewrite using IIS server (.Net service) and on apache server mod rewrite and really don't understand why we need a python server. In my experience, google doesn't penalize url rewrite. I can give you examples www.recycleinme.com www.biznessuae.com which is receiving much more traffic from google after URL rewrite..

Thanks for your comment. I was cofused by some one that python server is required for rewriting. thanks so much.

Well, Google does seem to have given me a penalty for using URL rewriting. Every single file using URL rewriting at #Letstalk can no longer be found in the Google index.

Regarding spam, it does seem that one of my old pages is indexed +1000 times, because it once used a temporary garbage attribute (file.asp?garbage=<10randomletters>). to void some browser caching issues. So "spam" is still very possible...

did you remember to redirect your old URLs to the new ones?

Not a chance!

Bad coding is more likely.