September 2021 DB‑Engines Ranking: Oracle, MySQL, SQL Server Lead While PostgreSQL & MongoDB Surge
The September 2021 DB‑Engines ranking shows Oracle, MySQL and Microsoft SQL Server retaining the top three spots, while MySQL falls sharply, SQL Server continues a downward trend, and PostgreSQL and MongoDB climb, with detailed score changes and trend charts illustrating shifting database popularity.
Ranking Overview
DB‑Engines recently released its September 2021 database engine ranking, evaluating 354 DBMS models with a composite score. The top three positions remain unchanged: Oracle (1271.55), MySQL (1212.52) and Microsoft SQL Server (970.85).
Microsoft SQL Server, ranked third, continues a downward trajectory, losing 91.91 points year‑over‑year and 2.5 points since August, though it still outperforms PostgreSQL (577.50). MySQL experienced the most pronounced drop, down 51.72 points compared to September 2020 and 25.69 points since August.
Among the lower‑ranked entries, Redis moved up from seventh to sixth place, while IBM Db2 fell from sixth to seventh, swapping positions. Cassandra entered the top ten at rank 10, displacing Microsoft Access.
The detailed September ranking (top 100) is illustrated in the following images:
Ranking Trend Chart
The ranking also provides trend charts for all databases from 2013 to 2021. The top‑15 databases are highlighted, revealing clear popularity shifts. While Oracle, MySQL, and SQL Server remain in the top three, SQL Server’s trend line slopes downward, whereas PostgreSQL and MongoDB show consistent upward movement.
Notably, the rising PostgreSQL and MongoDB curves appear poised to intersect with the declining SQL Server trajectory.
About the DB‑Engines Ranking
DB‑Engines is a project that collects and presents information about database management systems (DBMS). In addition to established relational databases, the ranking highlights the growing NoSQL ecosystem. Rankings are based on DBMS popularity and are updated monthly.
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