How MYSQL do the redo operation?
<p>We know in SQL server , the transaction log file contains both redo and undo log, however in the MYSQL transaction log ,it only contains the undo log , so how the MYSQL do the redo operation if it just writing just partial of the transaction data  for a successfully transaction ,then the server down?  As it is necessary to do the redo operation when reboot the server.</p>

<p><strong>Eidt, Sorry, I typo, I mean why MYSQL doesn't have the redo log instead of the undo log.</strong></p>