1.首先绝对不要关闭mysql 进程！！！
pidof mysql
2.确认误删除的文件是否存在
ls -trl /proc/PID/fd
3.禁止数据库写操作,防止数据恢复时不一致
flush tables with read lock;
4.写出内存脏页到磁盘，防止数据恢复时不一致
set global innodb_max_dirty_pages_pct=0；
5. 查看binlog 日志写入情况，确保file 和position 的值没有在变化
show master status;
6.恢复操作前，最后检查
查看innodb 状态，确保脏页已经刷入磁盘；show engine innodb status\G
mysql> show engine innodb status\G
。。。。
------------
TRANSACTIONS
------------
Trx id counter 9474
Purge done for trx's n:o < 4548 undo n:o < 0 state: running but idle
####确保后台purge 进程已经把undo log 全部清除掉，事务ID 要一致。
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 0 merges
#####insert buffer 合并插入缓存等于1
---
LOG
---
Log sequence number 1774886
Log flushed up to 1774886
Pages flushed up to 1774886
Last checkpoint at 1774886
####确保以上3个值不在变化
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 137363456; in additional pool allocated 0
Dictionary memory allocated 63733
Buffer pool size 8191
Free buffers 7931
Database pages 260
Old database pages 0
Modified db pages 0
####确保脏页数量为0
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Main thread process no. 16855, id 139960302381376, state: sleeping
Number of rows inserted 0, updated 0, deleted 0, read 0
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
复制 /proc/PID/fd/ 路径下删除的ib_logfile，ibdata文件到 原来位置，并修改用户属性：
chown mysql:mysql ib*
确保所有文件已经正常恢复后，重启mysqld 进程
service mysqld restart
or
/etc/init.d/mysql restart