MySQL / MariaDB
One of the world's most widely deployed open source relational database management systems, offering ACID-compliant transactions, robust SQL support, replication, and a massive ecosystem. Accessed via SQL drivers (mysql2 for Node, mysqlclient/PyMySQL for Python, MySQL Connector for Java). MariaDB is a community fork with additional features and performance improvements.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Native MySQL auth with roles and permissions. TLS connection recommended but optional by default. User accounts with database/table-level privileges. GRANT system for fine-grained permissions. MySQL Connector/J or PyMySQL for agents.
⚡ Reliability
Best When
An agent is working with an existing MySQL-based application stack (LAMP, LEMP) or needs a widely supported, battle-tested relational database with broad hosting provider support.
Avoid When
You need advanced SQL features (recursive CTEs, lateral joins, full JSON support), complex geospatial queries, or a database with stronger standards compliance.
Use Cases
- • Primary relational datastore for web applications and agent backends
- • Read-heavy workloads with replica routing
- • CMS and e-commerce backends (WordPress, Magento) that agents interact with
- • Transactional operations requiring InnoDB ACID guarantees
- • Multi-tenant SaaS applications with per-tenant schema isolation
Not For
- • Complex analytical queries requiring advanced window functions or CTEs (PostgreSQL excels here)
- • Document or graph workloads
- • High-cardinality time-series data
- • Agents needing a REST API without infrastructure setup
Interface
Authentication
Authentication via connection string (host, port, database, user, password). MySQL 8.0+ defaults to caching_sha2_password which some older drivers don't support — a common gotcha for agents. Fine-grained permissions via GRANT statements. SSL available but not always enforced by default in self-hosted deployments. AWS RDS MySQL supports IAM database authentication.
Pricing
MySQL Community Edition and MariaDB are free. MySQL Enterprise includes advanced features (audit, thread pool, enterprise backup) but targets commercial users. PlanetScale (built on Vitess) is a popular serverless MySQL platform.
Agent Metadata
Known Gotchas
- ⚠ MySQL 8.0 changed default auth to caching_sha2_password — many older drivers/ORMs fail to connect until configured with mysql_native_password
- ⚠ STRICT_TRANS_TABLES mode (default in 5.7+) rejects invalid data that older versions silently truncated — agent-generated data may fail validation
- ⚠ max_connections default of 151 is very low for multi-agent workloads — always configure connection pooling
- ⚠ MyISAM tables (still found in legacy databases) lack transactions and foreign keys — verify InnoDB is used
- ⚠ MySQL BIGINT AUTO_INCREMENT wraps at 2^63 — agents doing bulk inserts should monitor ID exhaustion
- ⚠ Character set issues: ensure utf8mb4 not utf8 is used (MySQL's 'utf8' is actually 3-byte and mangles emoji)
- ⚠ No community MCP server with broad adoption — third-party MCP servers have inconsistent quality and security
Alternatives
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Scores are editorial opinions as of 2026-03-06.