I'm not a big fan of memory-only stores, but I believe sled is entirely in memory. @asonix@lemmy.ml is that correct? Its key-value, so not SQL-like, so maybe not the best for your use case.
I do really recommend using sqlite, or if its server-based, postgres. These aren't written in rust obvi but they have great performance, and there are plenty of rust libraries to talk to them.
Also if your use case is storing text-documents, I def would not use a memory store.
Sled is my go-to key value store in Rust. It flushes to disk every 500ms by default iirc
It also has .flush() and .flush_async() to flush inline with your application if you need that
I definitely don't want a database that needs to be installed first as I want to write a tool that can be thrown at a user and is instantly usable. So PostgreSQL and similar DBs are not an option. My problem with SQLite is, that it's not available everywhere, so I'd have to ship it with my app which again leads to a more complex setup. I'll have a look at sled, though, thanks!
To add to what others have said, you could try RocksDB and use one of the many Rust wrappers available. I have never used it, but I've heard great things from it, and afaik the Conduit project is working on moving from sled to RocksDB. Maybe you could hop on their Matrix channel and chat about this :)
I'll check it out, thanks for the suggestion!
I hope you find something that suits you well :D
Curious to see what you settle with in the end hehe
For a work project (a portable maintenance and incident management application) we'll go with SQLite/rusqlite because of familiarity and some other reasons. And it can be linked statically, as suggested by @pinknoise
For a private project (a note taking app ... yeah, I know, there are already thousands, but I need a real project for learning more Rust) I'm still playing around with the options.
Sounds like a nice plan :)