Essay on High Availability Database System - 1268 Words

High Availability Database System Today, we depend so heavily on information systems that system outage or loss of data is more and more intolerable. Sometimes the loss of critical data relates directly to the survivability of an enterprise. This draws our attention to the dependability of information system. According to dependability is â€Å"the ability to avoid service failures that are more frequent and more severe than is acceptable† and availability is one of the most important attributes of dependability. Since database systems are the back end of most information system, their availability is critical to the availability of whole information system. Ensuring the continuous availability of the computing resources in the enterprise is a†¦show more content†¦High convenience places additional rigorous demands on the system, requiring minimum levels of service and strength within the face of failures. An oversized spectrum of applications would like higher levels of accessibility from their Database Management System (DBMS), as well as real period of time and embedded systems, internet applications and alternative sorts of online systems. Availability can be defined as the time that a system or resource is available for use. The definition of high availability is typically measured according to its percentage of absolute availability where 100 percent means that the resource is available all of the time and there is no downtime. However, 100 percent availability is very difficult to achieve. A robust software system will handle typical and traditional failures (like, power loss) and preserve information integrity, at the loss of information accessibility throughout recovery. However, high accessibility demands might necessitate recovery from additional severe failures, like media (failure) and network failure. Some things would like reduced or no time period for recovery from failures. A. Factors Influencing Availability The demands for information to be available 24 hours a day, 7 days a week, and 365 days of the year are influenced by many factors. The principle factors that can act as barriers to creating a highly available operating environment are: †¢ People †¢ Process †¢ TechnologyShow MoreRelatedBusiness Impact Analysis Paper728 Words   |  3 PagesDatabases - Implement High Availability for Mission Critical Mission critical databases support services that have an immediate, direct, and significant impact on revenue, goodwill, health and safety, and regulatory compliance. They require more attention than other systems. I will be discussing the following topics in this paper 1. Understand why implementing high availability for mission critical databases is so important to ITs success. 2. 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