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APPLIES TO: 2013 2016 2019 SharePoint Online. When you perform a full crawl for a content source, all content specified by the content source is crawled even if the content already exists in the search index. You can start a full crawl for each content source separately.
In SharePoint, content is automatically crawled based on a defined crawl schedule. The crawler picks up content that has changed since the last crawl and updates the index. You will want to manually request crawling and full re-indexing of a site, a document library, or a list after a schema change has occurred.
How to crawl user profiles in SharePoint Server?
To crawl user profiles and then crawl SharePoint Server sites Verify that the user account that performs this procedure is an administrator for the Search service application that you want to configure. Follow the instructions in Deploy people search in SharePoint Server.
How does crawling your website affect your performance?
To frequently crawl content that is updated more often. Crawling content can significantly decrease the performance of the servers that host the content. The effect depends on whether the host servers have sufficient resources (especially CPU and RAM) to handle the load.
Deployment questions about SharePoint 2013 can be answered here: http://social.technet.microsoft.com/Forums/en-US/sharepointadmin and for versions prior to 2010 here: http://social.technet.microsoft.com/Forums/en-US/sharepointadminlegacy 1 1 I performed a full crawl in our non-prod SharePoint 2010 farm.
How to create a search service in SharePoint?
For more information, see Create and configure a Search service application in SharePoint Server 2016. A Search service application can contain one or more content sources. Each crawl that you perform is associated with a particular content source, which specifies the content to crawl.