Best highperf database for simple read/write (no update) scenario

I'm interested in opinions on what database system to select for this project where I basically need to persist a constant stream of messages at potentially high speed. There's basically four types of messages with some commonalities. No relations neede开发者_Go百科d. I guess you could call it an event store.

I will need to read (query by a non-unique key), but I don't need to update any data. I will have to delete old data though.

Considerations:

• Database must be able to scale out
• Performance is crucial
• as well as up-time (system allowing live updates would be nice)
• Preferably something running on Windows Server, but this is not a requirement

I'm familiar with document databases (MongoDB), but don't know what other kinds of NoSQL solutions would fit my problem, or how they compare.

MongoDb would be ideal. But if all you want to do is read from the stream and serve up content, more than database consideration (use any db - mysql, access, sql server express, xml files), I would suggest you look at putting all your data in memory (maybe at app startup); and then serve up data from memory.

You should also look at some caching solutions like Memcached (http://memcached.org/)