轉載自：https://www.cnblogs.com/igoodful/p/9013806.html
mysql一直啟動不成功，查看data下的err文件，發現
解決方案如下：
1. 關閉mysqld進程
2. 刪除data目錄下的兩個文件
3. 重新打開mysql，成功
免責聲明！
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