A web application has 120,000 users, of whom 20% are active during peak hours. Each active user generates 5…

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A web application has 120,000 users, of whom 20% are active during peak hours. Each active user generates 5 requests per minute. Each application server handles 800 requests per second, and each request generates 2 database queries. Each database server can process 1,000 queries per second. Calculate the minimum number of application and database servers required.

rhs · Answer

Peak request rate 	ext{Active users} = 120{,}000 	imes 20\% = 24{,}000 24{,}000 	imes 5 = 120{,}000\ 	ext{requests/min} = \dfrac{120{,}000}{60} = 2{,}000\ 	ext{requests/s} Application servers \dfrac{2{,}000}{800} = 2.5 \;\Rightarrow\; \lceil 2.5 ceil = 3 (two servers would handle only 1,600 req/s). Database servers 2{,}000 	imes 2 = 4{,}000\ 	ext{queries/s}, \quad \dfrac{4{,}000}{1{,}000} = 4 Minimum: 3 application servers and 4 database servers. (In practice add at least one extra of each for redundancy, N+1.)

A web application has 120,000 users, of whom 20% are active during peak hours. Each active user generates 5 requests per minute. Each application…

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