Its in-memory storage, distributed architecture, scalability, and failover mechanisms collectively contribute to its exceptional performance and reliability, especially in demanding transactional environments like online and mobile banking systems. The ability to store data in memory is a standout feature, enhanced by robust failover mechanisms. Even in scenarios where all servers experience downtime, it ensures data safety by maintaining a copy on disk.

It's a distributed relational database, so it does not have a single server, it has multiple servers. Its architecture itself is fast because it has multiple nodes to distribute the workload and process large amounts of data. I heard a client processed 3.5 billion records in seven minutes! Their data ingestion is very high, and SingleStore even markets itself as the world's fastest database.

The paramount advantage is the exceptional speed. Another noteworthy aspect of our experience is that, upon its setup, there aren't any issues that necessitate the intervention of a DBA. In terms of performance, it has proven impressive, particularly in handling complex joins without the need for data shortening. It excels in executing complex SQL operations swiftly.

The most valuable features are: 

• MySQL drop-in solution: MemSQL supports the MySQL protocol, and many functions are similar, so the learning curve is very short. Developers were able to code against MemSQL the same day. They configured MemSQL in Docker and were up and running.
• MemSQL built-in pipeline: You can connect MemSQL directly to an S3 bucket and it will ingest its data automatically. There is no need to create a lambda function. It just works. You can connect to Kafka, HDS, and other protocols.
• Support for CTE, Window, Stored Procedures, functions (UDF, Table) are all included. MemSQL is a full-blown database solution. 
• Replication: A MemSQL cluster can replicate to another cluster. This is a great feature, allowing you to have one cluster that does all the heavy work, and a Replica for reads. 
• MemSQL supports high concurrency, and scaling horizontally is limitless.
• I really like the MemSQL portal (portal.memsql.com). Creating more labs is the best way to introduce people to MemSQL.

The product can automatically reinstall and reconfigure in case of a shutdown. 

The most valuable feature is the ability to create pipelines, streamline and extract data from the pipelines.