📅 最后修改于: 2020-11-23 08:59:49 🧑 作者: Mango
| Comparison Feature | CouchDB | MongoDB |
|---|---|---|
| Data Model | It follows the document-oriented model and data is presented in JSON format. | It follows the document-oriented model but data is presented in BSON format. |
| Interface | CouchDB uses HTTP/REST based interface. It is very intuitive and very well designed. | MongoDB uses binary protocol and custom protocol over TCP/IP. |
| Object Storage | In CouchDB, database contains documents. | In MongoDB, database contains collections and collection contains documents. |
| Query Method | CouchDB follows Map/Reduce query method. (JavaScript+others) | MongoDB follows Map/Reduce (JavaScript) creating collection + object-based query language. |
| Replication | CouchDB supports master-master replication with custom conflict resolution functions. | MongoDB supports master-slave replication. |
| Concurrency | It follows MVCC (Multi Version Concurrency Control). | Update in-place. |
| Preferences | CouchDB favors availability. | MongoDB favors consistency. |
| Performance Consistency | In CouchDB is safer than MongoDB | In MongoDB, database contains collections and collection contains documents. |
| Consistency | CouchDB is eventually consistent. | MongoDB is strongly consistent. |
| Written in | it is written in Erlang. | it is written in C++. |