URL change - delete pages or not

Hi.
I plan to change some page's urls. The problem is that those pages are indexed and cached by google and i think that if I change the URL these "new" pages will be considered duplicated content and will not appear in google.

What should I do ?
Should I delete the pages indexed by google ( i mean to delete them from google) before change the URL ?

Thanks for answers.

 

I agree with Smyrl, redirect the old page(s) to the new page(s) via 301 redirect. This redirect will prevent the "duplicate content" issues and you won't lose the visitors who would otherwise get a 404 error from those pages you would have deleted.

 

Aha. Thanks very much for answer.

But..still i have some questions.

After using the 301 redirect and google cacheing the new pages, can i remove the 301 redirect because google indexed the new url ?

And another question.
I have 20 pages with duplicate content. I plan to rewrite them and delete the ones with duplicate content. The new pages will have different url.

I must delete the 20 pages from google or leave them since i write the new ones with different url ? (the 20 pages with duplicate content will be deleted on my site)

Thanks again

 

Anyone ?
Any opinion about this ?

 

Personally I would leave the 301 in place forever....old links may be pointing to it afterall...

 

Agreed. Just leave the 301 redirect there. It doesn't making any harm sitting there.

 

I did this about 6 months ago and lost no rankings for anything. Went from .php to .html and just did 301's and all was good.

 

Allow me to add in additional.

The 301 redirect is even useful if you change your directory. I have done it before.

 

You should leave the 301 on your site. Not only google stores your links, maybe some bookmarked a page or put up a link on another site to your pages. And a 301 redirection script will not take up that much diskspace

 

I have just done this to a site in my sig 301 redirect, then remove the old content. Leave the 301 and wait for G to pick up your new pages. Def delete the old pages.

 

Ooooo, thanks a lot for your answers.

Still one last question:

I have many pages that i want to change. Should I place a 301 for every page ? (i don't think that i can grup them)

It's wrong to use multiple 301 redirects?

 

No, it should be
if you got a 'normal' site with directories like /global/index.html
then a fetch for "/global" will allways result in a 301 redirect to "/global/".
If Google or Yahoo punishes you for having 301 redirects, it would be punishing all kinds of site world wide (that do not even know they have 301's -- that's why I say: you can use 301's

 

Yes, google recommeds you use 301 redirects
http://www.markcarey.com/googleguy-says/archives/discuss-301-redirect-for-google.html

I direct multiple pages to the same directory, I assume there is no issue with this.