What Were the Biggest Database Breakthroughs of 2015?

2015 was a turbulent year for the database sector, driven by cloud computing, the "Internet+" trend, and a push from vendors toward cloud‑native and integrated database services, reinforcing the inevitability of the cloud. While NoSQL and NewSQL concepts generated buzz, they did not displace traditional relational databases; instead, a convergence trend emerged, further accelerated by open‑source technologies.

NoSQL database SequoiaDB officially open‑sourced (December 19, 2014). SequoiaDB is a distributed document‑oriented database that stores JSON‑style data, addressing the rigidity and scalability limits of traditional databases and offering performance advantages for massive data workloads. Positioned as a potential HBase alternative, its open‑source release aims to serve Chinese enterprises and internet companies.

MySQL Cluster 7.4 released (March 2015) achieving 200 million queries per second. This ACID‑compatible, open‑source, transactional database provides real‑time in‑memory performance and 99.999% availability, targeting demanding telecom, web, mobile, and cloud environments.

MongoDB 3.0 official release (March 2015). The new version claims a 7‑10× increase in write throughput, an 80% improvement in data compression, and a 95% reduction in operational costs, marking a significant evolution for the popular NoSQL system.

Database pioneer Michael Stonebraker awarded the Turing Award (March 25, 2015). ACM recognized MIT professor Stonebraker, founder of SQL Server and Sybase, for his foundational contributions to database systems.

Alibaba’s OceanBase reaches financial‑grade deployment (April 2, 2015). Developed by Ant Financial and Alibaba, OceanBase now powers daily transactions for Taobao, Tmall, and Juhuasuan, supporting billions of records and hundreds of terabytes with distributed, cross‑table transactions, marking the first major Chinese‑origin relational database.

MarkLogic secures $102 million financing (May 2015). The NoSQL vendor raised a round led by Wellington Management, with Sequoary Capital and Northgate participating; pre‑money valuation exceeded $1 billion, and 80% of new customers switched from Oracle.

DTBase integrated database appliance launched (July 2015). DTBase, from Shumei, offers a DBaaS‑style solution combining storage, backup, high‑availability, migration, monitoring, and optimization in a single hardware‑software package.

GBase 8t released by Tianjin Nanda (June 30, 2015) and subsequently listed on the New Third Board. Built on a domestically adapted Informix core, GBase 8t targets high‑end financial, telecom, and government transaction workloads, narrowing the gap with international competitors.

Greenplum (GPDB) open‑sourced (October 2015). The massively parallel processing database, suited for large‑scale analytics, data warehousing, BI, and data mining, now has its source code available on GitHub: https://github.com/greenplum-db/gpdb.

Inspur releases K‑DB 11g (November 5, 2015). The server‑vendor‑turned‑database provider promotes high availability, performance, compatibility, and security, positioning K‑DB as an Oracle‑free alternative for critical OLTP workloads.

Neo4j launches openCypher (November 2015). The NoSQL graph database team introduced an open‑source graph query language derived from Cypher, enabling standardized graph data retrieval across implementations.

The overall market structure is gradually shifting, with new service models emerging and no single vendor maintaining a monopoly. Domestic policies and open‑source momentum are expanding space for Chinese databases, while coverage of foreign giants will appear in future round‑ups.