Explanation/Reference:
Explanation:
A: The maximum number of sessions and workers are determined by the service tier and performance level (DTUs and eDTUs).
B: Performance levels are calibrated and governed to provide the needed resources to run your database workload up to the max limits allowed for your selected service tier/performance level. If your workload is hitting the limits in one of CPU/Data IO/Log IO limits, you will continue to receive the resources at the maximum allowed level, but you are likely to see increased latencies for your queries.
Reference:
https://docs.microsoft.com/en-us/azure/sql-database/sql-database-service-tiers
https://azure.microsoft.com/en-us/blog/azure-sql-database-introduces-new-near-real-time-performance- metrics/