The critical data in an organization. See Tier 1 application.
"Tier 1 database." YourDictionary, n.d. Web. 14 October 2018. <http://www.yourdictionary.com/tier-1-database>.
Tier 1 database. (n.d.). Retrieved October 14th, 2018, from http://www.yourdictionary.com/tier-1-database
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