# Advanced

- [Database Migrations and pg-mig Tool](/advanced/database-schema-migrations.md)
- [Ephemeral (Symbol) Fields](/advanced/ephemeral-symbol-fields.md)
- [Atomic Updates and CAS](/advanced/atomic-updates-and-cas.md)
- [Custom Field Refactoring](/advanced/custom-field-refactoring.md)
- [VC Flavors](/advanced/vc-flavors.md)
- [Query Cache and VC Caches](/advanced/query-and-custom-caches.md)
- [Loaders and Custom Batching](/advanced/loaders-and-custom-batching.md)
- [PostgreSQL Specific Features](/advanced/postgresql-specific-features.md)
- [Query Planner Hints](/advanced/query-planner-hints.md)
- [Cluster Maintenance Queries](/advanced/cluster-maintenance-queries.md)
- [Logging and Diagnostic Tools](/advanced/logging-and-diagnostic-tools.md)
- [Composite Primary Keys](/advanced/composite-primary-keys.md)
- [Passwords Rotation](/advanced/passwords-rotation.md)