How may I find why Google indexes less webpages in my site?
I´ve recently find this:
And I wonder why could make Google index less pages. I´ve then tried the Google help, and it wasn´t that helpful:
A steady increase in the number of crawled and indexed pages indicates that Google can regularly access your content, and that your site is being indexed.
If you see a sudden drop in the number of indexed pages, it may mean that your server is down or overloaded, or that Google is having trouble accessing your content.
To see the percentage of your site that’s accessible to Google, compare the number of crawled pages with the number of pages blocked by robots.txt. Sudden spikes or dips that appear in several charts can indicate problems with site configuration, redirects, or security.
Now, on June 3rd Google says: Googlebot can't access your site
Over the last 24 hours, Googlebot encountered 179 errors while attempting to retrieve DNS information for your site. The overall error rate for DNS queries for your site is 5.0%.
Now, I´ve recently (january 2013) updated my site from Drupal 6 to Drupal 7, and some links were changed. I´ve tried to solve the issue, and after that I´ve followed Google´s instructions:
After you think you've fixed the problem, use Fetch as Google to verify that Googlebot can properly access your site.
I´ve clicked "fetch as Google" and it says "success" URL and linked pages submitted to index. I´ve clicked on those site errors, and it says: DNS OK Server Connectivity OK Robots.txt Fetch OK
So, how may I find issues? Should I go and check out every single page of my site? What if I find a link is broken because I no longer use it?