gh-ost

Designed exclusively for MySQL, so it cannot be used with other database systems like PostgreSQL or MongoDB, limiting its applicability in polyglot environments.

Requires binary logging to be enabled and properly configured, which might not be feasible in all environments or could add setup complexity, as noted in the requirements.

Optimal usage involves having replicas for testing, increasing infrastructure and management costs for teams without existing replica setups, per the testing recommendations.

Involves non-trivial setup steps, such as ensuring proper permissions and binary log settings, which can be daunting for less experienced users despite the detailed docs.