It's also worth while reading the rebuttal from ravendb: https://ayende.com/blog/196161-C/re-are-you-sure-you-want-to-use-mmap-in-your-database-management-syste

It's also worth while reading the rebuttal from ravendb: https://ayende.com/blog/196161-C/re-are-you-sure-you-want-to-use-mmap-in-your-database-management-system https://ayende.com/blog/196161-C/re-are-you-sure-you-want-to... Also worth mentioning LMDB, probably the fastest embedded K/V db in terms of read perf uses mmap.