SQL databases are required to contain the domain repository, the Model repository, the monitoring Model repository, and the Hive metadata repository.

Azure SQL databases are categorized as Basic, Standard, or Premium. These categories are based on database transaction units (DTU). Higher DTU means higher performance, as well as higher cost. You should balance performance needs with your budget.

The following table shows a range of Standard instances:

Instance Level	DTU
S1	20
S2	50
S3	100
S4	200
S5	400

Standard DB instances, which are available in a range of instance sizes, will suit most of your needs. For I/O-intensive workloads, you can scale up to a Premium DB type.

The following table lists the minimum DTU requirements for the VM on which each repository database resides: