Glossary · Databases

DBMS (Database Management System)

A DBMS is the software that creates, stores, secures, and queries databases, handling storage, concurrency, transactions, and access control for applications.

Updated October 6, 2026

A database management system (DBMS) is the software layer that sits between applications and stored data. It handles storage on disk, query processing, concurrent access, security, and crash recovery so applications do not have to.

Why it matters

The DBMS is what makes a pile of data usable by many clients at once. It parses queries, picks an execution plan, enforces constraints, manages locks or versions so users do not overwrite each other, and writes a log so committed data survives a power loss. Choosing a DBMS therefore decides your data model, scaling options, and operational tooling.

Example

Common systems fall into families:

Relational : PostgreSQL, MySQL, MariaDB, SQLite
Document   : MongoDB
Key-value  : Redis
Graph      : Neo4j

The database is your data; the DBMS is the engine that serves it.

Common mistakes

  • Using "database" and "DBMS" as exact synonyms. The data and the software managing it are separate things.
  • Picking a DBMS by popularity alone, without checking its consistency and scaling model against your workload.
  • Ignoring version support dates, which leaves you on a release that no longer gets security fixes.

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Keep reading

Glossary · DatabasesACID (Database Properties)ACID stands for atomicity, consistency, isolation, and durability, the four guarantees that make database transactions reliable even during errors and crashes.Glossary · DatabasesCAP TheoremThe CAP theorem states that a distributed data store facing a network partition must choose between consistency and availability.Glossary · DatabasesDatabase Connection PoolA connection pool keeps a set of open database connections ready for reuse, avoiding the cost of opening a new one for every request and capping server load.

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