[nekitamo]

I've used RocksDB a lot in the past and am very satisfied with it. It was helpful building a large write-heavy index where most of the data had to be compressed on disk.

I'm wondering if anyone here has experience with LMDB and can comment on how they compare?

https://www.symas.com/mdb

I'm looking at it next for a project which has to cache and serve relatively small static data, and write and look up millions of individual points per minute.

[hyc_symas]

LMDB is for read-heavy workloads. The opposite of RocksDB.

RocksDB can use thousands of file descriptors at once, on larger DBs. Makes it unsuitable for servers that may also need to manage thousands of client connections at once.

LMDB uses 2 file descriptors at most; just 1 if you don't use its lock management, or if you're serving static data from a readonly filesystem.

RocksDB requires extensive configuration to tune properly. LMDB doesn't require any tuning.