Document Databases Compared: CouchDB, MongoDB, RavenDBBrian Ritchie has two posts (☞ here and ☞ here) covering three document databases: CouchDB, MongoDB, and RavenDB concluding with the matrix below: But before using this as a reference material there are a couple of corrections needed: They have some special characteristics that make them kick some serious SQL. Objects can be stored as documents: The relational database impedance mismatch is gone.
