Sitemap submission frequency

[jojy]

Hi,
I have a site that updates every second minute by users. I am wondering how often should I send ping to google and other search engines.. for sitemap updates.

Thanks

[tedster]

Does this help?

Q: My site has tens of millions of URLs; can I somehow submit only those that have changed recently?

You can list the updated URLs in a small number of Sitemaps that change frequently and then use the lastmod tag in your Sitemap index file to identify those Sitemap files. Search engines can then incrementally crawl only the changed Sitemaps.

[google.com...]

[jojy]

I am aware of this and I have configured parameters correctly. The reason I asked the question was one of my fellow is updating sitemap and sending ping to google every hour and he said it works.. wondering if every large site does this..