Reason:
Windows MySQL5.7 may have been mistakenly manipulated, causing something to be lost. So choose to back up the good data and reinstall. But the problem is that the root password always needs to be used the last time, guess that Windows uninstall is not clean caused. Here to share the MySQL5.7 considerations for re-installing Windows environments. (As for why with Windows, here do not give explanations, I also very tangled, the director needs)
Steps to resolve:
1, Backup good data (preferably on another machine to verify the availability of data)
2. Turn off MySQL and then proceed.
3, Control Panel or 360, computer steward Uninstall and MySQL related components.
4. Check if the Windows installation MySQL directory is still remaining, and then delete. (Pay special attention to the default installation path)
5. Clean up the registration form (this step is important)
6. Restart the machine and install.
The above is the situation of Bo Master, tried 3 times experience. otherwise not always.
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Windows MySQL5.7 Reinstall Considerations!