千万不要慌张 此时只要不重启服务 mysql数据库还是可以使用的
如何恢复
前提
不要把mysqld进程杀死，且不能关闭mysql服务
查到mysqld的pid
[mysql@mvxl0782 binlog]$ netstat -nltp|grep mysqld
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp 0 0 :::3306 :::* LISTEN 18401/mysqld
这里18401
2.利用进程pid查看对应的文件描述符
[mysql@mvxl0782 binlog]$ ll /proc/18401/fd|egrep 'ib_|ibdata'
lrwx------ 1 mysql mysql 64 8月 11 10:33 10 -> /mysql/server/data/ib_logfile1
lrwx------ 1 mysql mysql 64 8月 11 10:33 11 -> /mysql/server/data/ib_logfile2
lrwx------ 1 mysql mysql 64 8月 11 10:33 4 -> /mysql/server/data/ibdata1
lrwx------ 1 mysql mysql 64 8月 11 10:33 9 -> /mysql/server/data/ib_logfile0
上面的10、11、4和9就是我们要恢复的文件
3、关闭前端业务或执行flush tables with read lock; 不让有数据写入
4、验证有没有数据写入
a.先输入下面命令，让脏页尽快写入到磁盘里
set global innodb_max_dirty_pages_ptc=0;
b.查看binlog日志写入情况，确保file和position没有变化 show master status;
c.最后查看innodb状态信息，确保脏页已刷入到磁盘中
show engine inndodb status\G
TRANSACTIONS
...........
trx id counter A21837
Purge don for trx's n:o<A21837 undo n:o<0
##确保后台purge进程把undo log全部清除掉，事务ID要一致
INSERT BUFFER AND ADAPTIVE HASH INDEX
Ibuf:size 1,free kust keb 65,seg size67,0 merges
##插入buffer合并插入缓存等于1
LOG
Log sequence number xxxx
Log flushed up to xxxx
Last checkpoint at xxx
##确保这3个值不在变化
BUFFER POOL AND MEMORY
............
Modified db pages 0
##确保脏页数量为0
ROW OPERATIONS
..................
0.00 inserts/s,0.00 updates/s,0.00 deletes/s,0.00 reads/s
#确保插入、更新、删除为0
5.恢复操作
[mysql@mvxl0782 binlog]$ ll /proc/18401/fd|egrep 'ib_|ibdata'
lrwx------ 1 mysql mysql 64 8月 11 10:33 10 -> /mysql/server/data/ib_logfile1
lrwx------ 1 mysql mysql 64 8月 11 10:33 11 -> /mysql/server/data/ib_logfile2
lrwx------ 1 mysql mysql 64 8月 11 10:33 4 -> /mysql/server/data/ibdata1
lrwx------ 1 mysql mysql 64 8月 11 10:33 9 -> /mysql/server/data/ib_logfile0
将上面文件复制并改名：
cp 10 /mysql/server/data/ib_logfile1
cp 11 /mysql/server/data/ib_logfile2
cp 4 /mysql/server/data/ibdata1
cp 9 /mysql/server/data/ib_logfile0
授权：
cd /mysql/server/data
chown -R mysql:dba ib*
最后重启mysql
转自http://blog.csdn.net/zengxuewen2045/article/details/52333383
