Clarification on indexation of XML sitemaps within Webmaster Tools

[Silkstream]

Hi Mozzers,

I have a large service based website, which seems to be losing pages within Google's index. Whilst working on the site, I noticed that there are a number of xml sitemaps for each of the services. So I submitted them to webmaster tools last Friday (14th) and when I left they were "pending".

On returning to the office today, they all appear to have been successfully processed on either the 15th or 17th and I can see the following data:

13/08 - Submitted=0 Indexed=0
14/08 - Submitted=606,733 Indexed=122,243
15/08 - Submitted=606,733 Indexed=494,651
16/08 - Submitted=606,733 Indexed=517,527
17/08 - Submitted=606,733 Indexed=517,498

Question 1: The indexed pages on 14th of 122,243 - Is this how many pages were previously indexed? Before Google processed the sitemaps? As they were not marked processed until 15th and 17th?

Question 2: The indexed pages are already slipping, I'm working on fixing the site by reducing pages and improving internal structure and content, which I'm hoping will fix the crawling issue. But how often will Google crawl these XML sitemaps?

Thanks in advance for any help.

[PatrickDelehanty]

Hi again

This means that because you have multiple sitemaps, Google is going to crawl those at different times possibly and at different rates, hence some of your sitemaps taking a day longer. I really wouldn't look into it too much, and just be assured that Google is crawling your sitemaps fine and indexing.

If you notice major discrepancies in what you submitted and what's being indexed, then I would refer to this Google resource on how to fix issues or errors you find in your sitemap crawl.

Hope this helps! Good luck!

[PatrickDelehanty]

Hi there

You submitted on the 13th, there were 0 pages indexed. The next day there were 122,243, so in that time period, Google indexed 122,243 of your site's pages.

This is a day by day process. So whatever new number appears on each day, subtract the previous day's number from your present day number, and that's how many pages were freshly indexed.

Hope this helps! Good luck!

[Silkstream]

Just checked webmaster tools again, and now they (sitemaps) all say processed on 17th and some say 18th (today) does this mean the sitemaps are being processed by Google every couple of days?

[Silkstream]

Hi Patrick,

Thanks for elaborating on question 2.

Question 1, I asked if the number (122,243) was how many pages were in the index** before** google processed the sitemaps, as they don't appear to have been processed until the following day.

You answered, yes but then said its how many pages were processed that day?

Thanks again for your time and clarification.

[PatrickDelehanty]

Hi there

Question 1 - Yes, this is how many pages Google indexed from your sitemap on that day.

Question 2 -  XML sitemaps allow you to tell Google the change frequency of your URLs - you can learn more about that here. Also, according to Google:

Google's spiders regularly crawl the web to rebuild our index. Crawls are based on many factors such as PageRank, links to a page, and crawling constraints such as the number of parameters in a URL. Any number of factors can affect the crawl frequency of individual sites.

Our crawl process is algorithmic; computer programs determine which sites to crawl, how often, and how many pages to fetch from each site. We don't accept payment to crawl a site more frequently. For tips on maintaining a crawler-friendly website, please visit our Webmaster Guidelines.

Please let me know if you have any further questions or comments.

Hope this helps! Good luck!