If your site is exceptionally large, you can use the date based filters to view a sample of recently indexed pages in Google to see if there are any duplication issues amongst those pages.

Questions Answered by the Website Health Check Tool


* Is Google indexing your site? Are they quickly indexing your new pages ?
* Do you have duplicate content pages getting indexed in Google ?
* Do you have canonical URL issues ?
* Are any of your pages in Google missing page titles ?
* Does your server send correct error messages ?

Read more at New SEO Tool: Website Health Check Tool