MySQL vs Oracle Database: Key Differences (2026)

Quick verdict

Short answer

Choose MySQL for web and application back ends where a free GPL server, wide hosting support and simple SQL are enough, or MySQL HeatWave if you want Oracle's managed MySQL service with built-in analytics. Choose Oracle AI Database when you need its enterprise feature set (PL/SQL packages, RAC, Partitioning, Data Guard, multitenant) or run applications certified on it, and can budget for edition and option licences. Same owner does not mean compatible: SQL, procedural code and tooling differ.

How we know: This comparison is research-based: editions, licences, release models and SQL behaviour were checked against mysql.com, the MySQL Reference Manual, the MySQL HeatWave documentation, and the Oracle AI Database 26ai documentation (SQL Language Reference, Licensing Information User Manual, Free installation guide) in October 2026. We have not run performance tests, and nothing here is a benchmark.

MySQL came to Oracle with its acquisition of Sun Microsystems. MySQL Community Server is available under GPLv2, and Oracle sells commercial licences and paid editions: MySQL Standard Edition, Enterprise Edition, Classic Edition,NDB Cluster Carrier Grade Edition, and MySQL Embedded for OEMs and ISVs. MySQL ships Long-Term Support releases (8.4 and 9.7), which only receive fixes, and Innovation releases; from July 2026 versions use calendar numbering, so the newest Innovation release is MySQL 26.7. MySQL HeatWave is Oracle's fully managed MySQL service, which Oracle describes as combining transactions, analytics, machine learning and GenAI, with a Lakehouse feature for querying files in object storage. It runs on OCI, AWS and Azure.

Oracle AI Database is Oracle's flagship relational database, previously sold as Oracle Database. The current release is 26ai, which replaced Oracle Database 23ai. Oracle's 26ai licensing manual lists Enterprise Edition (on Linux x86-64), Enterprise Edition on engineered systems, Standard Edition 2 on Oracle Database Appliance, cloud offerings on OCI, and Oracle AI Database Free, a no-cost edition with fixed resource limits.

Side by side

Aspect	MySQL	Oracle
Licence	Community Server under GPLv2; commercial licence and paid editions from Oracle	Proprietary; Free edition under the Oracle Free Use Terms and Conditions
Release model (Oct 2026)	LTS (8.4, 9.7) and Innovation (26.7, calendar versioning)	Oracle AI Database 26ai, updated through release updates
Free option	Full Community Server with no resource caps	Oracle AI Database Free: 2 cores, 2 GB RAM, 12 GB user data
Platforms (self-managed)	Linux, Windows and macOS builds	26ai Enterprise Edition on Linux x86-64; Free on Linux x86-64, ARM Linux and Windows
Procedural code	Stored procedures, functions and triggers in SQL; no packages	PL/SQL with packages, plus extensive built-in packages
Auto-numbering	AUTO_INCREMENT; no CREATE SEQUENCE	Identity columns and sequences
High availability	Replication, Group Replication and InnoDB Cluster	Data Guard; RAC and Active Data Guard as extra-cost options
Managed cloud	MySQL HeatWave (OCI, AWS, Azure), Amazon RDS and Aurora, Google Cloud SQL, Azure Database for MySQL	OCI Autonomous Database and Base Database Service, Oracle Database@Azure, @Google Cloud and @AWS, Amazon RDS for Oracle
Main trade-off	Fewer enterprise features in the free server; backup, audit and encryption tooling is in Enterprise Edition	Licence cost and complexity; many features are extra-cost options

Key differences

Purpose and editions

Oracle positions the two products differently. MySQL is the open source database behind a large share of web applications; its paid editions add tools on top of the same server, such as Enterprise Backup, Transparent Data Encryption, Enterprise Audit and Enterprise Firewall in Enterprise Edition. Oracle AI Database is a single proprietary product whose capabilities are divided between editions and extra-cost options: the 26ai licensing manual lists RAC, Partitioning, Database In-Memory, Active Data Guard, Advanced Security, Multitenant (beyond 3 user-created PDBs) and the Diagnostics and Tuning packs as extra-cost on Enterprise Edition.

The managed offerings follow the same split. MySQL HeatWave is a managed MySQL service with an in-memory analytics engine, Lakehouse, AutoML and GenAI features. Oracle's managed Oracle AI Database services (Autonomous Database, Base Database Service, Exadata Database Service) run on OCI and, through Oracle Database@Azure, @Google Cloud and @AWS, inside other clouds' data centres.

Free options compared

MySQL Community Server is the full server under GPLv2, with no resource caps. Oracle AI Database Free is a no-cost edition that Oracle documents as limited to two cores, 2 GB of RAM and 12 GB of user data, with one installation per host, VM or container; it includes several features that are extra-cost on Enterprise Edition, such as Partitioning and In-Memory. That makes it useful for learning and development, but not for growing data sets. If you need to distribute MySQL inside a proprietary product without meeting GPL terms, Oracle sells a commercial licence for that.

SQL dialect differences

Row limiting, auto-numbering and string aggregation are written differently:

-- MySQL
CREATE TABLE orders (id INT AUTO_INCREMENT PRIMARY KEY, total DECIMAL(10,2));
SELECT * FROM orders ORDER BY id DESC LIMIT 10;
SELECT GROUP_CONCAT(name ORDER BY name SEPARATOR ', ') FROM staff;

-- Oracle
CREATE TABLE orders (id NUMBER GENERATED ALWAYS AS IDENTITY PRIMARY KEY, total NUMBER(10,2));
SELECT * FROM orders ORDER BY id DESC FETCH FIRST 10 ROWS ONLY;
SELECT LISTAGG(name, ', ') WITHIN GROUP (ORDER BY name) FROM staff;

Upserts use ON DUPLICATE KEY UPDATE in MySQL (with a row alias from 8.4, since VALUES() there is deprecated) and MERGE in Oracle:

-- MySQL 8.4 and later
INSERT INTO stock (sku, qty) VALUES ('A1', 5) AS new
ON DUPLICATE KEY UPDATE qty = new.qty;

-- Oracle
MERGE INTO stock t
USING (SELECT 'A1' AS sku, 5 AS qty FROM dual) s
ON (t.sku = s.sku)
WHEN MATCHED THEN UPDATE SET t.qty = s.qty
WHEN NOT MATCHED THEN INSERT (sku, qty) VALUES (s.sku, s.qty);

Two behaviours catch people out. Oracle treats a zero-length character value as NULL, while MySQL stores '' as an empty string, so WHERE col IS NULL can return different rows. And MySQL's BOOLEAN is a synonym for TINYINT(1), while Oracle 26ai has a true SQL BOOLEAN type. Identifiers are quoted with backticks in MySQL by default and double quotes in Oracle.

Procedural code, JSON and data types

MySQL stored programs are written in SQL with BEGIN ... END blocks and have no package concept. Oracle's PL/SQL groups code into packages with shared state and ships a large library of built-in packages, which is one reason Oracle applications are hard to move to any other engine. Both have a native JSON type: MySQL stores it in a binary format and supports the -> and ->> operators; Oracle 26ai lists a JSON type (up to 32 MB per value) and a VECTOR type for AI Vector Search. In MySQL, vector and ML features are part of the HeatWave service.

Concurrency and high availability

Both use multiversion concurrency so readers do not block writers. MySQL's InnoDB defaults to the REPEATABLE READ isolation level; Oracle defaults to read committed. For high availability MySQL offers asynchronous and semi-synchronous replication, Group Replication and InnoDB Cluster. Oracle offers Data Guard standbys, and sells Real Application Clusters (shared-disk clustering) and Active Data Guard as extra-cost Enterprise Edition options; both are included in some higher cloud tiers.

For tools, MySQL Workbench is Oracle's GUI for MySQL (rebuilt on MySQL Shell in release 26.7). For Oracle AI Database, Oracle provides the free SQL Developer extension for VS Code. DBeaver and DataGrip connect to both.

Pricing and licensing

MySQL. MySQL Community Server is free under GPLv2. Oracle did not list prices for MySQL Standard, Enterprise or Cluster editions on the product pages checked, and directs buyers to sales. MySQL HeatWave is billed as a cloud service at OCI, AWS or Azure rates; check the relevant price list.

Oracle AI Database. Oracle AI Database Free costs nothing, within its limits. Enterprise Edition and its extra-cost options and packs are licensed separately. Oracle publishes list prices in its Technology Global Price List, but that document could not be retrieved from oracle.com when we checked, so we do not quote figures. Amazon RDS for Oracle offers hourly License Included pricing or Bring Your Own License.

Pricing checked on the vendors' official pages on 7 October 2026. Prices change; confirm before buying.

Where each one leads

MySQL strengths

GPLv2 Community Server with no resource caps or licence fees
Widely supported by hosts and managed services, including HeatWave, Amazon RDS, Google Cloud SQL and Azure
Simple SQL dialect and quick to learn for web applications
Clear LTS and Innovation release tracks with published support periods

Oracle strengths

PL/SQL packages and a large built-in package library for complex server-side logic
Enterprise options such as RAC, Partitioning, In-Memory and Active Data Guard
Identity columns, sequences, MERGE and a SQL BOOLEAN type in the core dialect
Native JSON and VECTOR types with AI Vector Search in the database itself
A free edition that includes several Enterprise options for learning

Limitations

MySQL limitations

No sequences, no MERGE and no packages
Backup, audit, firewall and encryption tooling require paid Enterprise Edition
Innovation releases are supported only until the next Innovation release and can change behaviour
Analytics, ML and vector features are tied to the HeatWave cloud service

Oracle limitations

Proprietary licensing with many extra-cost options; list prices could not be retrieved
Free edition capped at 2 cores, 2 GB RAM and 12 GB of user data
Empty strings are treated as NULL, unlike MySQL and the SQL standard
26ai Enterprise Edition for on-premises use is listed for Linux x86-64 only

When to choose each

Choose MySQL if

You are building a web or SaaS application and want a free, widely hosted database
Your stack or framework already assumes MySQL
You want Oracle's managed MySQL with built-in analytics (HeatWave)
You want to avoid edition and option licensing

Choose Oracle if

You run enterprise packaged applications certified on Oracle
You need RAC, Partitioning, Active Data Guard or other Oracle options
Your team has a PL/SQL code base built on packages
You want vector search and JSON in the same database as your relational data, with Oracle support

When neither is right

You want a free engine with richer SQL than MySQL (MERGE, RETURNING, jsonb, extensions) and no licence fees: see PostgreSQL vs Oracle and MySQL vs PostgreSQL.
You want a MySQL-compatible server not owned by Oracle: see MariaDB vs MySQL.
You are a Microsoft shop: see SQL Server vs Oracle.

Final recommendation

Bottom line

These are different products for different jobs, even though Oracle owns both. MySQL suits web and application workloads where a free GPL server and broad hosting support matter more than enterprise options. Oracle AI Database suits enterprise systems that need PL/SQL packages, RAC or its other options, and organisations prepared to manage its licensing. Moving between them is a full migration, not an upgrade: plan for SQL dialect, procedural code and NULL handling changes.

Frequently asked questions

Does Oracle own MySQL?

Yes. MySQL is developed by Oracle, which sells MySQL paid editions and the MySQL HeatWave cloud service alongside Oracle AI Database. MySQL Community Server remains available under GPLv2.

Is MySQL the free version of Oracle Database?

No. They are separate engines with different SQL dialects and code bases. Oracle's free edition of its main database is Oracle AI Database Free, limited to two cores, 2 GB of RAM and 12 GB of user data.

What is MySQL HeatWave?

Oracle's fully managed MySQL service. Oracle describes it as combining transactions, analytics, machine learning and GenAI in one service, with HeatWave Lakehouse for querying data in object storage. It is available on OCI, AWS and Azure.

Can I move an Oracle schema to MySQL?

Tables and data usually move with type mapping, but PL/SQL packages, sequences, MERGE statements and Oracle-specific functions must be rewritten, and empty-string behaviour differs. Test the result thoroughly.

Sources

Checked October 2026.

How we research comparisons: our editorial method.