mysql-文件损坏，无法启动怎么办？

背景

突然断电或者其他异常情况导致，mysql 索引或者binlog文件损坏，无法启动怎么办？本文将介绍Mysql数据重置方法

修改配置

vim /etc/my.cnf
innodb_force_recovery=3
systemctl restart mysql

备份

mysqldump -u root -p --all-databases > backup_all_${日期}.sql
systemctl stop mysql

数据初始化

rm -rf /data/mysql/data/*

/usr/local/mysql/bin/mysqld --defaults-file=/usr/local/mysql/my.cnf \
--basedir=/usr/local/mysql/ \
--datadir=/data/mysql/data/ \
--user=mysql \
--initialize-insecure \
--ssl \
--explicit_defaults_for_timestamp \
--verbose

修改配置

vim /etc/my.cnf
innodb_force_recovery=0
systemctl restart mysql

账号初始化

# 第一次登录密码为空
mysql -uroot -p 
Enter password:
alter user 'root'@'localhost' identified by '${密码}';
grant all on *.* to 'root'@'%'IDENTIFIED BY '${密码}';
flush privileges;

恢复

nohup mysql -uroot -pgzgd < /data/mysql/backup_all_20220519.sql >/data/mysql/nohup.log 2>&1 &