MongoDB-a database based on distributed file storage, written in C++ language, aims to provide scalable and high-performance data storage solutions for WEB applications. Its biggest features are powerful query language, high local performance, easy deployment, convenient data storage and free mode.

Is an open source distributed NoSQL database system. Originally developed by Facebook, it is used to store simple format data such as inbox, which has the characteristics of flexible mode, multi-data center identification and strong expansibility.

Hadoop HBase-Based on the sparse and column-oriented database implementation theory of Google BigTable, it is built on Hadoop's hdfs.

Couch base- is a clustered document-based database system, which uses a cache layer to provide very fast data access and stores most of the data in RAM.

Secondary- is a network-oriented database. In other words, an embedded, disk-based Java persistence engine has complete transaction characteristics, but it stores structured data on the network instead of in tables.