Support Matrix

Queen has one API across drivers, but databases do not provide the same locking, transaction, and DDL behavior. Use this page before picking a production target.

Driver capabilities

Database	Driver package	Lock type	Migration body transaction	Migration record atomic with body	Rollback support	Production fit
PostgreSQL	drivers/postgres	Advisory lock on a pinned connection	Yes	Yes	Yes, when migration has DownSQL or DownFunc	Reference production path
MySQL	drivers/mysql	GET_LOCK on a pinned connection	Yes for transactional statements	No	Depends on MySQL DDL semantics	Usable with DDL caveats
SQLite	drivers/sqlite	Local SQLite write coordination	Yes for transactional statements	No	Yes for transactional statements	Local, tests, single-process tools
ClickHouse	drivers/clickhouse	Best-effort table guard with expiry	No true transaction model	No	Limited by ClickHouse DDL behavior	Operationally serialized deployments
CockroachDB	drivers/cockroachdb	Table row with expiry	Serializable transactions	No	Yes, but retry handling is caller/deploy concern	Needs retry-aware operations
MSSQL	drivers/mssql	sp_getapplock on a pinned session	Yes for transactional statements	No	Depends on SQL Server DDL semantics	Usable with DDL caveats

Feature matrix

Feature	PostgreSQL	MySQL	SQLite	ClickHouse	CockroachDB	MSSQL
SQL migrations	Yes	Yes	Yes	Yes	Yes	Yes
Go-function migrations	Yes	Yes	Yes	Yes	Yes	Yes
Mixed SQL + Go migrations	Yes	Yes	Yes	Yes	Yes	Yes
Automatic checksum for SQL	Yes	Yes	Yes	Yes	Yes	Yes
Manual checksum for functions	Yes	Yes	Yes	Yes	Yes	Yes
Bounded lock timeout	Yes	Yes	Limited by SQLite behavior	Best effort	Yes	Yes
Multi-process lock suitable for production	Yes	Yes	No	Best effort	Yes, with retry care	Yes
Migration body and record in one transaction	Yes	No	No	No	No	No
Pool adapter	pgxpool	No	No	No	No	No

How to read "atomic record"

"Migration record atomic with body" means Queen commits both the migration work and the row in the migration table in the same database transaction. PostgreSQL currently has the strongest guarantee because its driver implements transactional recording.

For other drivers, a migration can succeed and the record write can fail as a separate step. That is rare, but it matters for incident playbooks: check status, log, and your schema before retrying.

Recommended choices

• Use PostgreSQL for the strongest current Queen contract.
• Use SQLite for local development, tests, and embedded tools.
• Use MySQL and MSSQL when your team already understands each database's DDL transaction behavior.
• Use CockroachDB with retry-aware deployment scripts.
• Use ClickHouse only with one migrator process at a time.