In-Memory OLTP and Real-Time Operational Analytics are available for preview in Premium databases in Azure SQL Database. With In-Memory OLTP, you can achieve a gain in transaction throughput up to 30 times. With In-Memory Analytics, you can achieve up to 100 times improvement in query performance, depending on the workload.
In-Memory OLTP includes the expanded surface area available in SQL Server 2016, enabling more applications to benefit from higher performance.
For more information, please see Get started with SQL In-Memory (Preview)