> ## Documentation Index
> Fetch the complete documentation index at: https://headgate.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# MySQL

> SQL transactions and inspection with a polling-first worker path.

MySQL implements the same core store and admission behavior as PostgreSQL. It supports
application transactions and the bounded inspection surface, but it has no equivalent of
PostgreSQL `LISTEN/NOTIFY`, so workers poll with exponential empty-queue backoff.

## Important differences

* No partial indexes; active uniqueness uses generated nullable columns.
* No push wakeup capability; polling is honest and first-class.
* Migration locking is scoped with a configurable namespace.
* Database-level instance isolation replaces PostgreSQL schema isolation.

<Note>
  The cross-language conformance corpus compares MySQL behavior with PostgreSQL and Redis.
  Backend-specific verification status is recorded in the capability and MySQL ledgers.
</Note>

<Card title="Migration runbook" icon="database-zap" href="/docs/operations/migrations" />