MYSQL two-phase commit

MYSQL two-phase commit

Binlog and redolog both record data. When recording data, whether to write binlog or redolog first, there will be problems whether redolog or binlog is written first. Both files must be written or not written.If the redolog is written and the binlog is not written, it may cause data inconsistency
Both binlog and redolog will record data at the same time, so what is the order of their records?

Execution process:
1. The executor first finds the data from the engine, if it returns directly in the memory, if it is not in the memory, it returns after the query
2. After the executor gets the data, it will first modify the data, and then call the engine interface to rewrite the data
3. The engine updates the data to the memory and writes the data to the redo at the same time. At this time, it is in the prepare stage and informs the executor that the execution is completed, and can be operated at any time.
4.The executor generates the binlog of this operation
5. The executor calls the transaction commit interface of the engine, the engine changes the redo that has just been written to the commit state, and the update is completed

Two Phase Commit