记mysql启动不了了的解决⽅法
系统: centos7
本地的环境，mysql启动不了，查看 /var/log/mysqld.log 有以下内容
2018-12-24T08:05:38.090527Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details). 2018-12-24T08:05:38.092747Z 0 [Note] /usr/sbin/mysqld (mysqld 5.7.24) starting as process 8111 ...
2018-12-24T08:05:38.097352Z 0 [Note] InnoDB: PUNCH HOLE support available
2018-12-24T08:05:38.097394Z 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-12-24T08:05:38.097403Z 0 [Note] InnoDB: Uses event mutexes
2018-12-24T08:05:38.097409Z 0 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2018-12-24T08:05:38.097414Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
2018-12-24T08:05:38.097419Z 0 [Note] InnoDB: Using Linux native AIO
2018-12-24T08:05:38.097778Z 0 [Note] InnoDB: Number of pools: 1
2018-12-24T08:05:38.097922Z 0 [Note] InnoDB: Not using CPU crc32 instructions
2018-12-24T08:05:38.099800Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
mysql下载不了怎么办
2018-12-24T08:05:38.111257Z 0 [Note] InnoDB: Completed initialization of buffer pool
2018-12-24T08:05:38.114082Z 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-12-24T08:05:38.168814Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2018-12-24T08:05:38.174135Z 0 [ERROR] InnoDB: Ignoring the redo log due to missing MLOG_CHECKPOINT between the checkpoint 211934516 and the end 211934208.
2018-12-24T08:05:38.174251Z 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error
2018-12-24T08:05:39.877511Z 0 [ERROR] Plugin 'InnoDB' init function returned error.
2018-12-24T08:05:39.877609Z 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2018-12-24T08:05:39.877631Z 0 [ERROR] Failed to initialize builtin plugins.
2018-12-24T08:05:39.877646Z 0 [ERROR] Aborting
参考中写的
Rename or move both the ./ib_logfile0 and ./ib_logfile1 files, and then start the MySQL server.
进⼊ /var/lib/mysql 重命名或者移除 ./ib_logfile0 和 ./ib_logfile1 ⽂件，最后启动mysql服务器
如果数据库中表查询或者更新⽆法进⾏，可以尝试使⽤ mysql的客户端⼯具(如:phpmyadmin) 导出这个数据库⽂件，删除这个个数据库的表，然后重新导⼊刚才导出的数据库⽂件

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