SharePoint 2010 builds indexes of content sources. The indexing process is called a crawl. Crawls occur on specific schedules and run according to crawl rules that you set up. You can view the crawl logs to determine whether indexing is working properly.
Managing Crawl Schedules
SharePoint 2010 indexes content sources based on scheduled crawl cycles. The crawl cycles must be configured as part of the setup of a content source. SharePoint 2010 can conduct two types of crawl:
Full Crawl A full crawl indexes all content in the content source. A full crawl is required when you index a content source for the first time in order to completely discover and capture all the content. Full crawls are not required thereafter except under specific ...