[Nican]

As usual, there is a spectrum of data safety vs. performance. Redis is at the "very fast, but unsafe" side of the scale.

ScyllaDB for me is in the middle of being high performance key-value store, but not really supporting transactions. FoundationDB is another one that I would consider.

[tyre]

Depends on the kind of safety you’re looking for. Redis is entirely safe from concurrency issues because it’s single-threaded. It supports an append-only file for persistence to disk.