Best Database Software in 2026

Oracle Database is Oracle Corporation's flagship commercial relational database. The current release is branded Oracle AI Database 26ai. Its documentation highlights JSON Relational Duality (which exposes relational data as JSON documents), SQL property graphs, JavaScript stored procedures, Sagas for microservices, in-database machine learning, and AI Vector Search for storing and querying embeddings alongside business data. The New Features guide for Release 26ai was last revised on 20 October 2026.

The documented features show a multi-model engine handling relational, JSON document, graph, machine-learning and vector workloads in one database. A free edition, Oracle AI Database 26ai Free, is offered for development and learning. Oracle's public price list and product pages returned access errors during this review, so licence prices are not quoted here. The feature breadth is the widest in this list; the main drawback for buyers is that licence costs cannot be checked against a public price list and must be negotiated with Oracle.

Microsoft SQL Server is the company's relational database for Windows and Linux, closely integrated with Azure, Power BI and Microsoft Fabric. SQL Server 2025 (version 17.x) adds a native vector data type and vector functions, a vector index in preview, management of external AI models for generating embeddings, a native JSON type, regular-expression functions, change event streaming to Azure Event Hubs or Fabric, an MCP server for AI agents and mirroring to Microsoft Fabric. Standard edition limits rose to the lesser of four sockets or 32 cores and 256 GB of buffer-pool memory, Express edition now allows 50 GB databases, Web edition was discontinued, and new free Standard Developer and Enterprise Developer editions were introduced.

Microsoft's published SQL Server 2022 prices give a guide to licensing costs: Enterprise at US$15,123 per two-core pack, Standard at US$3,945 per two-core pack or US$989 per server plus US$230 per client access licence, with Developer and Express free. Subscriptions cost US$5,434 per year (Enterprise) or US$1,418 (Standard) per two-core pack, and pay-as-you-go through Azure Arc costs US$274 or US$73 per core per month. Several components were dropped in 2025, including Master Data Services, Data Quality Services and Synapse Link.

PostgreSQL began in 1986 as the POSTGRES project at the University of California, Berkeley, and is developed by a global community under the PostgreSQL Licence, a liberal open-source licence similar to BSD or MIT. The current major release is PostgreSQL 18, with point release 18.7 published on 12 November 2026 alongside updates to versions 14 to 17, and PostgreSQL 19 at release-candidate stage.

Its feature set is broad: JSON and JSONB, arrays, ranges, UUIDs and custom types; B-tree, GiST, GIN and BRIN indexes; multiversion concurrency control, partitioning, parallel query and JIT compilation; all SQL-standard isolation levels including Serializable; write-ahead logging with asynchronous, synchronous and logical replication and point-in-time recovery; and authentication via LDAP, SCRAM-SHA-256, certificates or OAuth 2.0 with row- and column-level security. Extensions such as PostGIS and foreign data wrappers allow it to act as a platform rather than a single product. Most cloud providers and many start-ups, including Supabase, Neon and Amazon Aurora, build services on PostgreSQL compatibility. The main limitation is that operations, such as high availability and connection pooling, require third-party tools or a managed service.

MySQL is a multithreaded, multi-user SQL database server owned by Oracle Corporation, intended for heavy-load production systems and for embedding in mass-deployed software. It is dual-licensed: free under the GNU General Public License, or under a commercial licence purchased from Oracle. The reference manual covers the 9.x innovation series, long-term support releases 8.4 and 8.0, and newer release tracks numbered 26.x.

Oracle sells several commercial offerings: MySQL HeatWave, a cloud service combining transactions with lakehouse-scale analytics, generative AI and machine learning; MySQL Enterprise Edition for business-critical applications; and an embedded edition for ISVs, OEMs and resellers. Standard Edition and NDB Cluster CGE are also listed; prices are obtained from Oracle sales. MySQL's strengths are its simplicity, enormous installed base in web applications and broad hosting support. Its limitations include a feature set narrower than PostgreSQL in areas such as advanced indexing and extensibility, and the fact that some enterprise features, such as advanced backup and auditing, are reserved for commercial editions.

MongoDB was founded in 2007 (originally as 10gen) by Dwight Merriman, Eliot Horowitz and Kevin Ryan, and reports more than 67,000 customers. It is the best-known document database: data is stored as flexible JSON-like documents rather than fixed tables, which suits evolving application schemas.

MongoDB Atlas, the company's managed cloud service, has a free M0 tier with 512 MB of storage, a Flex tier at US$0.011 per hour capped at US$30 per month with 5 GB of storage, and Dedicated clusters from US$0.08 per hour (US$56.94 per month for an M10) scaling from 10 GB to 4 TB of storage and from 2 to 96 vCPUs. MongoDB Enterprise Advanced is a commercially licensed self-managed edition priced on request, and Community Edition is available at no cost for local development and self-hosting. The trade-offs are that joins and multi-document transactions are less natural than in relational systems, and Dedicated cluster costs rise steeply with larger instances.

Amazon Aurora is a relational database service built by AWS that is compatible with MySQL and PostgreSQL, allowing existing databases to be migrated with standard tools. AWS claims up to six times the throughput of standard PostgreSQL and MySQL and offers availability of up to 99.99% in a single region and up to 99.999% across regions. Aurora Serverless scales capacity automatically, and Aurora DSQL is a PostgreSQL-compatible distributed SQL option for globally distributed applications.

Pricing is usage-based. AWS's worked examples for the I/O-Optimized configuration in US East (N. Virginia) use US$0.156 per Aurora capacity unit (ACU) hour for serverless capacity and US$0.225 per GB-month for storage. Provisioned instances, reserved pricing and a standard configuration with I/O charges are also available. Aurora removes most operational work around replication, backups and failover, but it ties workloads to AWS, its performance claims are vendor figures, and compatibility with every community PostgreSQL extension or MySQL feature should be checked before migration.

Redis is an in-memory data structure store used as a cache, message broker, session store and, increasingly, a vector database. Its licensing has changed repeatedly: versions up to 7.2 were BSD-licensed; from March 2024 Redis 7.4 onward moved to dual RSALv2 and SSPLv1 source-available licences; and with Redis 8 the company added the OSI-approved AGPLv3 as a third option. Modules such as RediSearch, RedisJSON, RedisTimeSeries and RedisBloom are now part of Redis Open Source under the same tri-licence. The pricing page references Redis 8.8.

Redis Cloud has a free 30 MB database on shared infrastructure; Essentials from US$0.007 per hour (US$5 per month) covering 250 MB to 100 GB with SSO, role-based access and encryption and up to 99.99% uptime; and Pro from US$0.014 per hour with a US$200 monthly minimum (the first US$200 free), unlimited memory, multiple databases, active-active multi-region replication and up to 99.999% uptime, on AWS, Azure and Google Cloud. Redis is very fast for key-value workloads, but memory-resident data is costly at large volumes, and buyers need to check which of the three licences applies to their use.

Db2 is IBM's relational database. The current Db2 12.1 line is sold in three editions: a free Community edition limited to four CPU cores and 16 GB of memory with community support; Standard, limited to 16 cores and 128 GB with enterprise support; and Advanced, with no resource limits, for mission-critical workloads. Standard and Advanced are licensed standalone (perpetual or monthly) or as cartridges (perpetual or subscription).

IBM also offers Db2 as a managed service on IBM Cloud. A perpetually free tier provides a serverless configuration with one schema, 200 MB of storage and five connections, and the Performance plan starts at US$630 per month, billed hourly at US$0.22 or US$0.29 per vCPU plus storage and IOPS charges, scaling from 4 vCPUs and 50 GB to 128 vCPUs and 40 TB. IBM describes these prices as indicative. Db2 is robust and well supported, but its ecosystem and talent pool are smaller than those of PostgreSQL, SQL Server or Oracle outside IBM-centric organisations.

MariaDB was started in 2009 by original MySQL developers, with Michael "Monty" Widenius regarded as its founder, and was designed as an enhanced drop-in replacement for MySQL. The MariaDB Foundation, a Delaware non-profit funded by sponsors, states that MariaDB Server will remain free and open source under GPLv2 independent of any commercial entity. The commercial company, MariaDB plc (MariaDB Corporation), is the primary code contributor and sells subscriptions and enterprise features; Widenius serves as its chief technology officer and as a Foundation board member.

MariaDB's commercial Enterprise Platform is sold in three self-managed subscription tiers, Platform, Platform Plus and Platform Ultimate, each priced on request, and a separate MariaDB Cloud service has its own pricing. Compatibility with MySQL has diverged over time, however, so migrations in either direction need testing, and enterprise pricing is not published.

SQLite is an in-process SQL database library: there is no separate server, and a complete database with tables, indexes, triggers and views lives in a single ordinary disk file. Its source code is in the public domain, so it can be used for any purpose without a licence. The file format is cross-platform between 32-bit and 64-bit and big- and little-endian systems, and the project describes it as stable and enduring; the US Library of Congress recommends SQLite files as a storage format.

The project describes SQLite as the most widely deployed database in the world, embedded in billions of devices and applications. Limits are large for an embedded engine: a maximum database size of 281 terabytes and a maximum row size of 1 gigabyte. SQLite is ideal for mobile apps, browsers, desktop software, IoT devices and test environments, and is increasingly used at the edge. It is not designed for high write concurrency from many clients over a network, so it rarely replaces a client-server database for multi-user transactional systems.

CockroachDB, developed by Cockroach Labs, is a distributed SQL database that combines relational consistency and ACID transactions with horizontal scaling: nodes can be added to scale reads and writes, with automatic rebalancing and hotspot detection. It offers a PostgreSQL-compatible SQL interface with migration tools, globally consistent transactions, global writes and data locality controls for placing data near users or within jurisdictions.

The managed service, Cockroach Continuum, is sold in two editions. Standard is priced at US$0.092 per vCPU-hour, about US$203 per month for 2 vCPUs and 100 GB on AWS us-east-1, although the features section quotes a rate from US$0.057; Mission Critical costs US$0.162 per vCPU-hour, about US$1,528 per month for 12 vCPUs and 100 GB. Both come with a 30-day trial and US$400 of credit. A self-hosted edition with enterprise security features is sold through sales. CockroachDB suits applications that must survive regional outages, but its distributed architecture adds latency to some transactions compared with single-node PostgreSQL, and not every PostgreSQL feature or extension is supported.

Supabase describes itself as the Postgres development platform: every project is a dedicated PostgreSQL database, optionally combined with authentication (20+ social sign-in providers, email, phone and magic links, with authorisation via row-level security), S3-compatible storage with a CDN, TypeScript edge functions, realtime WebSocket sync, auto-generated APIs and pgvector-based vector search. Its core is open source.

The Free plan includes a 500 MB database per project, a shared CPU with 500 MB of RAM, up to 50,000 monthly active users, 5 GB of egress and 1 GB of file storage, but limits accounts to two active projects, pauses projects after a week of inactivity and excludes automatic backups. Pro starts at US$25 per month and Team at US$599 per month, each including 8 GB of disk per project and then US$0.125 per GB; Enterprise is custom. Supabase gives small teams a full backend quickly while keeping standard PostgreSQL underneath, which eases later migration. Usage-based compute and egress charges need monitoring as applications grow, and the free tier is unsuited to production.

Neon is a serverless PostgreSQL service that separates storage from compute so databases can scale to zero and be branched like code. Its pricing page describes it as built around Lakebase Postgres, for developers, start-ups and agent platforms, "from Databricks", reflecting its acquisition by Databricks.

Pricing is usage-based without monthly minimums on paid plans. The Free plan is permanent, requires no card and includes 100 compute-unit (CU) hours per project and 1 GB of storage per project, up to 20 GB across the account. Launch costs US$0.106 per CU-hour and Scale US$0.222 per CU-hour, with storage at US$0.35 per GB-month and no storage cap. Branching and scale-to-zero suit preview environments and AI agent platforms, which Neon names as target users. Its limitations are cold-start latency when compute resumes from zero, a product direction now tied to Databricks' Lakebase strategy, and storage prices higher than raw block storage.