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Capacity Estimation

Before Moving to Design, It is good to further estimate the capacity on following ground:

  1. Daily/Monthly Active Users (DAU/MAU)
  2. Throughput: requests per second
  3. Storage: Gb, Tb [for 10 years]
  4. Network Bandwidth: Gbps

Capacity Estimation helps in the following:

  1. Number of Server and Databases required.
  2. Cost Management: Helps in Avoiding Over-provisioning and Under-provisioning.
  3. Decide type and specifications of hardware: Eg: Sql can handles 50K Queries/hr and No-Sql can handles 1M Queries/Hr
  4. Helps Us in determining Read-Heavy and Write-Heavy Operations Eg: For Read-Heavy Use- PostgresSql, and for Write-Heavy use CassandraDb

Definations:​

  1. Daily Active Users (DAU): Number of unique users active per day.
  2. Monthly Active Users (MAU): Number of unique users active per month.
MAU != 4*DAU