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I have set an incremental crawl rule to execute an incremental crawl every 20 minutes. But my question is do I need to perform a full crawl, beside the incremental crawl ? Regards

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A full crawl is needed to collect the items the incrementals don't catch. Items like manage properties and security updates on file shares are not considered in incremental searches. Also, a full crawl reindexes everything, therefore rebuilding the entire index, which can help reduce the chance of having a corrupted index. Because a full crawl take a lot more time and resources, I usually set them up nightly or weekly at 11p - 1a, depending on other factors (backups, amount of data, other system routines, etc).

HTH

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    Thanks for the explain. i have set a full crawl , every day at 1 am. – john Gu Sep 23 '13 at 13:49
  • Robert and David already added valuable information to this thread. User might find this blog post handy too. sannadisarath.blogspot.ca/2011/03/… – BlueSky2010 Mar 30 '15 at 15:41

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