Abstract: This article describes the advantages and development trends based on key-value storage. It also proposes ways to support transactions in the key-value storage model. New key-value storage database should have the ability of traditional database transaction and the new database transaction control requires a different strategy from traditional relational database. This paper describes the use of write-ahead log (WAL) and concurrent versions system (CVS) transaction control to meet the ACID properties.

Key words: key-value store, transaction control, entity group