Google specifies in their help pages that a sitemap cannot exceed 50,000 URLs. What happens if a sitemap does go over that limit? Does Google just only take the first 50K into consideration or does it realize that the sitemap is just way too big to even be worth parsing at all?

Not sure as they don't say what happens and no one seems to have tested it out. My guess is that they would ignore anything over the 50k mark. But that's just a guess.

Google sitemaps also have a 10MB limit. If that limit is crossed, you think Google just cuts off reading the file, in which case it won't be a valid XML file? I guess it can determine file size before starting to read ...

Why don't you try it and let us know what happens? ;)

Hi,

We can give them in some two to three files when URLs crosses over 50k.

cscgal, have a look at sitemaps.org, the answer is here :)