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Postgres vs. MySQL: DDL Transaction Difference
- Database schema changes require careful planning and execution, making DDL transaction handling crucial for database management systems.
- Transactional DDL in PostgreSQL 17 allows DDL statements in multi-statement transaction blocks for atomic commit or rollback.
- PostgreSQL ensures that DDL operations are fully transactional except for certain database or tablespace operations.
- MySQL 8 introduced Atomic DDL, providing statement-level atomicity but lacks support for multi-statement transactions.
- MySQL 8's DDL statements are atomic at the statement level, committing implicitly before execution.
- MySQL's atomic DDL is restricted to InnoDB storage engine, ensuring crash recovery and statement-level atomicity.
- In PostgreSQL, transactional DDL allows for complete rollback of all DDL operations within a transaction.
- MySQL 8 only supports statement-level atomicity, undoing an entire DDL transaction block is not possible.
- PostgreSQL's DDL handling supports multi-statement transactions and savepoints, providing fine-grained control over schema changes.
- In summary, PostgreSQL 17 offers full transactional DDL with multi-statement support, while MySQL 8 provides atomic DDL at the statement level.
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