1. RDBMS dominate the database market, but NoSQL systems are catchingup;Andlinger,2013
2. MongoDB in action;Banker,2011
3. The method of recovery for deleted record in Oracle database;Choi;J Korea Inst Inf Secur Cryptol,2013
4. Compose blog, “The MongoDB oplog and node.js”, https://blog.compose.io/the-mongodb-oplog-and-node-js/.
5. DB-ENGINES Homepage, http://www.db-engines.com/en/ranking.