When Google visits your site, it detects new and updated pages and links, and can use this information to update the Google index, which is used for both Google Web Search and Custom Search.
You can also request immediate indexing of new or updated URLs, so that the latest versions of these pages are included in your custom search engine within 24 hours. (Requesting indexing doesn’t have any effect on Google Web Search results, though.)
You can use the Index Now section of the Indexing tab to request immediate indexing of the following:
- Specific URLs. Google will index individual URLs you submit. This works well if you have only a small number of new or updated pages you want indexed.
- URLs linked from a specific page or Sitemap. Google will crawl a specific page or Sitemap to discover links to other pages on the same domain. All new pages will be added to the index, and will be crawled and indexed. In addition, Google will periodically revisit this page to discover and crawl new links. This method is ideal if your site lists its new or most important content on a single page—for example, the landing page of a blog or a table of contents—or if you frequently update Sitemaps to include links to your new content. You can specify multiple pages or Sitemaps.
- URLs in a Sitemap. Sitemaps are a way to tell Google about pages on your content we might not otherwise discover. This method is recommended if you have a large or complex site. You can also use a Sitemap to specify URLs you want removed from the custom search index. However, you will need to submit a new request every time you update your Sitemap or submit a new one.