Hi friend, In my site the url generates dynamically on user search. they index in google after some time. but my sitemap.xml doesn't update. I want to update my sitemap regularly..what should I can that it update automatically..plz tell me..
Learn how to confiure this, then update it using crond: https://www.google.com/webmasters/tools/docs/en/sitemap-generator.html
You have to create a google webmaster tool account to update your sitemap for the googlebot. Read the sticky and you can learn a lot. Or search; It had been discussed so many times here!
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If you are asking according to Google point of view? Google doesn't share his secrets but you can check in your Google Webmasters Tools
If you want to update the google sitemap then there are so many facilities can be available first of all FTP manager can upload the sitemap . search engine notification tools and uploads the site map there are so many features can be useful of google sitemap.