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DTU and eDTU in Azure SQL


DTU and eDTU in Azure SQL
The performance of SQL Database is based on DTU.
According to Microsoft, a DTU is a unit of measure of the resources that are guaranteed to be available to a single Azure SQL Database at a specific performance level within a single database tier. A DTU combines CPU, memory, data I/O, and transaction I/O.
  • Databases can be placed into an elastic pool on a SQL Database server that shares a pool of resources among those databases. The shared pool of resources are measured by elastic Database transition units (eDTU).
  • The advantages of an elastic pool are:
    • They are scaled automatically.
    • They provide predictable costs.
  • They are widely used for varying and unpredictable usage patterns.
Determining DTUs for Workloads
·         If you are planning to move your on-premises Databases to Azure SQL Database, Azure provides a DTU Calculator to find the approximate DTUs required for setting up the database.
·         For an existing Azure Database, you can use SQL Data query performance insight. This Query performance insight provides a deeper insight into the resource consumption (DTU's) of Database, the top queries by CPU/Duration/Execution count, which can potentially be tuned for improved performance.

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