A Proposal of Transaction Processing Method for MongoDB

At present, to deal with a large amount of variety data in the database, various NoSQL databases have been proposed and put to practical use. However, since most of them support the transaction processing only on the single data, there is the problem that the plural data cannot be updated in a lump with maintaining the ACID properties. To solve this problem, in this paper, we propose a method to process plural data as a single transaction for MongoDB, which is a kind of document oriented NoSQL database. Concretely, each data has both of the before and after update fields, and the state of the transaction is managed. Then, in the case of before the commit, the former data is queried; after the commit, the latter data is queried. By this method, we show that the plural data can be updated as a transaction with the specified isolation level.