We have recently changed the files names of our website pages but google is not updating that in their database.

How much time google takes to index the changed files names in their database.


Monty

They won't technically treat them as changed filenames, they're new pages. They could pick up the new ones while the pages with the old filenames are still in the index, so if you start to see no title/no description/URL only pages when doing a site: check - you'll know why.

You should use 301 redirect to redirect the old pages to the new (*not* meta refresh or JS redirect), or depending on the site structure maybe you can do something with mod_rewrite to accomplish it.

301s are the cleanest but can take a little while for the PR to transfer.

Yep, 301s are the way to go. Otherwise, as Marcia said, they will be seen as new pages. At any rate, Google should find new pages or redirects fairly quickly - it really depends on how often your site is crawled but I'd say a 2-3 weeks is a good estimation.

They're catching duplicates right away now. I watched a site change file extensions - and Google had both flavors of all the pages at the same time right off.