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What is Undo logs?

External reference

A type of logs used by storage engine to guarantee transaction ACID. Not all storage engine uses undo logs. e.g. PostgreSQL does not use undo logs while MySQL's InnoDB does. Undo logs are used to revert the uncommitted changes during crash recovery or restore the data to a particular version in order to provide a consistent view for a particular transaction.

Safer and faster database change and version control for DBAs and Developers

Bytebase is an open source, web-based database schema change and version control tool for teams. It offers a web-based collaboration workspace to help DBAs and Developers manage the lifecycle of application database schemas.