I have a sitemap uploaded for my web application. The webmasters has indexed 10% of all the URLs in sitemap so far and marked the remaining as excluded(discovered not indexed). I have made some changes in the app that has resulted in some new URLs and some duplicate URL's for the same content. Now I want to update my sitemap to include the latest URL's while preserving the URL's that are already indexed so far, I have following questions:
- What is the SOP/Best practice to update the sitemap with modified and new URLs?
Should I keep the older sitemap and upload another sitemap with the latest changes and keep multiple sitemaps OR should I replace the older one with the newer sitemap?
If I keep multiple sitemaps, what happens to those URLs which are in both of the sitemaps and already indexed from the older sitemap? does google automatically reuses the index or not?
If I replace the sitemap, what happens to those URLs which are duplicates(different URLs, same content) of any URL from the previous sitemap and was indexed previously? Does google reuse the index OR drop the index and add the new URL to the queue for indexing?
How does 301/302 redirect effects ranking of the page?