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The total minutes of a given month are n and the total time that the service has been unavailable is y. A component or system with high availability is one that runs continuously for an extended period. The widely-held but almost impossible to achieve standard of availability for a product or system is referred to as ‘five 9s’ (99.999 percent) availability 😁 High availability is a requirement for any enterprise that hopes to protect their business against the had risks brought about by a system outage 😎 These threats can cause revenue losses of millions of dollars. 
Failover allows in-progress questions to be reissued. They are then processed again from the start. This could extend the query’s duration if it’s taking too long. Transparent Application Failover is used to hide the failure for clients who query with a longer response time. The increased response time will be minimal if the client’s query is answered with the data from the buffer cache on the last node to which the client has reconnected. TAF’s PRECONNECT technique eliminates this problem. Need to reconnect to a surviving thereby reducing response times. But PRECONNECT waits to see if the event is a failover. 
According to the professionals from docs.oracle.comDue to the variety of Oracle technologies as well as software and hardware options available, creating and implementing high availability architectures can prove difficult. Clearly defining your business needs is key to success. An in-depth analysis of business requirements allows you to make informed design decisions. This will allow you to create the architecture that best meets your business’s needs. Your chosen architecture must meet the requirements of security, availability, and performance. You should also choose an architecture that has a clear plan for implementation and continuous management to reduce complexity and minimize business risk. This document was last revised 26 Days ago by Youssef, Yongzhou, China. 
Willian N. Docs.oracle.comA business must have high-availability best practise to create, maintain, and improve its high-availability infrastructure. This includes both the technical and operational elements of IT systems as well as business processes. This set of best practices reduces complexity in designing high-availability structures, optimizes system resource utilization, minimizes implementation and maintenance cost, and allows for easy replication of high-availability architectures in other business areas. Enterprises that have a clear set of high-availability best practise guidelines, including high-availability analytical frameworks, are more likely to be successful. Business drivers and system improved operational resilience, and greater business agility. This page was last modified on 81 days ago, by Chakita Star from Taiz in Yemen 
Docs.rightscale.com It also discusses how it is challenging to design high-availability cloud web applications due to all the possible failure scenarios and components. Because every web app has different requirements, the actual world can have large differences in deployments. RightScale offers solutions to the most commonly encountered use cases. This document is not intended to cover all possible scenarios. This guide will discuss the main components of a high-availability web server architecture. It also provides best practices for designing such an architecture. These elements should be considered when building such architectures. Each component should be carefully examined by an architect to ensure it’s load-balanced, fault-tolerant and scaleable. Samyra Perez, who pointed this out to us, deserves credit.