MySQL vs PostgreSQL: Key Differences, Performance and Which to Choose

MySQL and PostgreSQL are both mature, open-source relational databases, and either can run most web applications well. Choose MySQL for simple, read-heavy web apps, WordPress and PHP sites on low-cost hosting, and teams that already know it. Choose PostgreSQL for complex queries, rich data types such as JSONB, extensions such as PostGIS and pgvector, and applications that need strict SQL behaviour. The old advice that one is always “superior” is out of date: the right pick depends on your workload, hosting and team.

Quick answer

MySQL vs PostgreSQL at a glance

What is new in 2026

The database world changed in 2026, which makes old comparisons misleading.

• MySQL 8.0 reached end of life in April 2026. Oracle tells users to move to MySQL 8.4 LTS or a newer release. If your host or app still runs 8.0, plan an upgrade.
• MySQL 9.7 LTS shipped on April 21, 2026, the first long-term support release since 8.4, according to a 2026 comparison. MySQL now uses a calendar-style version scheme for innovation releases, so version numbers look different from before.
• PostgreSQL 18 (released September 25, 2025) added an asynchronous I/O subsystem that can speed up some storage reads by up to about 3x, plus OAuth 2.0 authentication. 18.6 was the latest minor release in August 2026, and it included many security fixes, so keep minor versions updated.
• PostgreSQL 19 was at the release-candidate stage in mid-October 2026, with general availability expected around the end of October. Features reported for it include a REPACK command to rebuild bloated tables with less locking and faster foreign key checks. Several planned features, including SQL/PGQ graph queries, were pulled before release. Test 19 before using it in production.
• Vectors and AI: MySQL 9 added a VECTOR type, but reports say it still lacks an approximate-nearest-neighbour index in the core server, so large-scale similarity search needs a separate service. PostgreSQL with pgvector is the more common choice today for vector workloads.

Key differences explained

1. Data types and JSON

Both store JSON. PostgreSQL’s JSONB stores JSON in a binary form that you can index with GIN indexes for fast lookups inside documents. PostgreSQL also has arrays, ranges, enums, UUIDs, network types and the ability to define custom types. MySQL covers the standard types well, with a JSON type and generated columns you can index, but it has fewer built-in advanced types.

2. SQL features and standards

Both now support common table expressions (CTEs), window functions and check constraints in current versions. PostgreSQL has historically followed the SQL standard more closely and offers features like partial indexes, expression indexes, materialized views and rich full-text search. MySQL has added many of these over time, so the gap is smaller than in older articles.

3. ACID and transactions

Our earlier version of this article said MySQL “fully” supports ACID. That is true for the default InnoDB engine, but not for older engines such as MyISAM, which is not transactional. PostgreSQL is fully ACID-compliant, including transactional DDL (schema changes can roll back). In MySQL, many schema changes commit automatically.

4. Concurrency (MVCC)

Both use multi-version concurrency control, so readers do not block writers. The details differ: PostgreSQL keeps old row versions in the table and cleans them with VACUUM (and autovacuum), while InnoDB keeps old versions in undo logs. In practice, PostgreSQL needs attention to autovacuum and table bloat, while MySQL needs attention to long transactions and purge lag.

5. Performance

The older rule “MySQL is faster for reads, PostgreSQL is faster for writes” is too simple. Results depend on your schema, indexes, queries, hardware and configuration. MySQL often does very well on simple primary-key lookups and straightforward web queries. PostgreSQL often does very well on complex joins, analytics and mixed workloads, and its planner is flexible. The only honest answer is to benchmark with your own data.

6. Storage engines and extensibility

MySQL has a pluggable storage engine design, though InnoDB is used for nearly everything. PostgreSQL has one main storage system with a table access method interface, and its strength is the extension ecosystem: PostGIS for maps, pgvector for embeddings, and many other extensions for search, time series and more.

7. Replication and scaling

Both scale reads with replicas. MySQL offers binary log replication, Group Replication and InnoDB Cluster. PostgreSQL offers streaming replication and logical replication, plus declarative partitioning. For horizontal write scaling you usually need sharding in either database, with tools such as Vitess for MySQL and Citus for PostgreSQL.

8. Security and authentication

Both support roles, TLS, encryption options and strong password hashing. PostgreSQL 18 added OAuth 2.0 support and MySQL 9.1 added WebAuthn. PostgreSQL also has row-level security built in, useful for multi-tenant apps. Whichever you use, keep minor releases updated, since both projects fix security flaws regularly.

9. Hosting, tools and ecosystem

MySQL (and its fork MariaDB) runs on almost every shared host and powers WordPress, which requires MySQL or MariaDB. PostgreSQL is well supported on VPS and cloud platforms, and many managed services are built around it. Major cloud providers offer managed versions of both. See our best web hosting in India guide and the guide to free web hosting to check what database your host offers.

10. Ease of use

MySQL is simple to install and has a gentle learning curve, with plenty of tutorials and tools such as MySQL Workbench and phpMyAdmin. PostgreSQL has a steeper start, but its tools (psql, pgAdmin) and documentation are excellent, and many developers prefer its strictness once learned.

Syntax differences with examples

MySQL:

CREATE TABLE users (
  id BIGINT AUTO_INCREMENT PRIMARY KEY,
  email VARCHAR(255) UNIQUE NOT NULL
);

INSERT INTO users (email) VALUES ('a@example.com') AS new
ON DUPLICATE KEY UPDATE email = new.email;

PostgreSQL:

CREATE TABLE users (
  id BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  email TEXT UNIQUE NOT NULL
);

INSERT INTO users (email) VALUES ('a@example.com')
ON CONFLICT (email) DO UPDATE SET email = EXCLUDED.email;

Other common differences:

• MySQL quotes identifiers with backticks; PostgreSQL uses double quotes.
• PostgreSQL is stricter about types and about grouping columns in GROUP BY.
• PostgreSQL string comparison is case-sensitive by default; MySQL’s depends on collation and is often case-insensitive.
• Both use LIMIT for paging.

When to choose MySQL

• You run WordPress, WooCommerce or another PHP CMS.
• You use low-cost shared hosting with cPanel.
• Your app is simple CRUD with straightforward queries.
• Your team already knows MySQL and tools around it.
• You want the largest pool of hosting providers and tutorials.

When to choose PostgreSQL

• You need complex queries, analytics, window functions and advanced indexing.
• You store semi-structured data and want fast JSON queries.
• You need geospatial data (PostGIS) or vector search (pgvector).
• You want strict data integrity, row-level security and transactional DDL.
• You are building a SaaS product on cloud or managed Postgres.

Using them with PHP and frameworks

PHP and its frameworks support both. CodeIgniter 4 works with both MySQL and PostgreSQL drivers, as do Laravel and Django. If you are learning, start with MySQL through our PHP course and CodeIgniter 4 guide, then try PostgreSQL on a small project to see the difference. Remember that SQL injection is a risk on both: always use prepared statements, and read our guides on how to check if your PHP website was hacked and PHP2Shell vulnerabilities.

Migrating between MySQL and PostgreSQL

1. List incompatibilities: data types, auto-increment columns, stored procedures, case sensitivity, and date and time handling.
2. Use a migration tool such as pgloader (MySQL to PostgreSQL) or your cloud provider’s migration service.
3. Test queries for syntax and performance differences.
4. Compare results on a copy of production data.
5. Plan a rollback and a short cut-over window.

What about MariaDB?

MariaDB is a fork of MySQL and is common on shared hosting. It is mostly compatible with MySQL for typical web apps, but the two have diverged in some features and version numbers. Check which one your host provides.

FAQs

What is the main difference between MySQL and PostgreSQL? MySQL focuses on simplicity, speed for common web workloads and wide hosting support. PostgreSQL focuses on advanced features, extensibility and strict standards compliance.

Which is faster, MySQL or PostgreSQL? It depends on the workload. MySQL often shines on simple lookups, and PostgreSQL often shines on complex queries. Benchmark your own queries and data.

Which is better for beginners? MySQL has a gentler start and more beginner hosting, but PostgreSQL is a good first database too if you plan to build modern apps.

Is PostgreSQL better than MySQL? Not always. PostgreSQL has more advanced features, while MySQL is simpler and more widely hosted. The better choice depends on your project.

Does MySQL support ACID transactions? Yes, with the default InnoDB engine. Older engines such as MyISAM do not.

Which is better for JSON? PostgreSQL’s JSONB with GIN indexes is usually stronger for querying inside JSON. MySQL’s JSON type works well for simpler needs.

Which is better for AI and vector search? PostgreSQL with pgvector is the more common choice today. MySQL has a VECTOR type, but large-scale similarity search usually needs an external service.

Which one does WordPress use? WordPress requires MySQL or MariaDB. It does not run on PostgreSQL by default.

Is MySQL 8.0 still supported? No. MySQL 8.0 reached end of life in April 2026. Upgrade to 8.4 LTS or a newer release.

Which is more secure? Both are secure when updated and configured well. PostgreSQL offers built-in row-level security, and both require strong passwords, TLS and patching.

Can I switch from MySQL to PostgreSQL later? Yes, but expect some work on data types, queries and tooling. Plan and test the move first.

Conclusion

There is no universal winner. MySQL is the practical choice for WordPress, shared hosting and simple web apps, while PostgreSQL is the stronger choice for complex data, JSON, geospatial and vector workloads. Pick the one that matches your hosting, your team and your data, keep it updated, and benchmark before you decide.

Version details were checked on October 30, 2026. Database releases move quickly, so confirm the latest versions and support status on the official MySQL and PostgreSQL sites.