背景：誤刪ibdata等檔案

[root@localhost /var/lib/mysql ]# rm -rf ib*
ib_buffer_pool ibdata1 ib_logfile0 ib_logfile1 ibtmp1

此時不要驚慌，因為mysql還是在執行的，也行進行操作，，如果關了mysql那就沒辦法了，恢復步驟如下
1.關閉所有業務寫入

flush tables with read lock

2.檢視mysql的pid號

[root@localhost /var/lib/mysql ]# ps -ef | grep -i mysql
root 386 1 0 May06 ? 00:00:00 /bin/sh /usr/local/mariadb/bin/mysqld_safe --defaults-file=/usr/local/mariadb/my.cnf
mysql 491 386 0 May06 ? 00:16:13 /usr/local/mariadb/bin/mysqld --defaults-file=/usr/local/mariadb/my.cnf --basedir=/usr/local/mariadb --datadir=/usr/local/mariadb/demo --plugin-dir=/usr/local/mariadb/lib/plugin --user=mysql --log-error=/usr/local/mariadb/demo/mardb.err --pid-file=/usr/local/mariadb/demo/mardb.pid --socket=/usr/local/mariadb/demo/mardb.socket --port=3333
root 14790 1 0 14:06 ? 00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --socket=/var/lib/mysql/mysql.sock --pid-file=/var/run/mysqld/mysqld.pid --basedir=/usr --user=mysql
mysql 15010 14790 0 14:06 ? 00:00:05 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock
root 18180 17974 0 15:03 pts/3 00:00:00 grep -i mysql
[root@localhost /var/lib/mysql ]# netstat -nputl|grep -i mysql
tcp 0 0 :::3333 :::* LISTEN 491/mysqld
tcp 0 0 :::3306 :::* LISTEN 15010/mysqld

3 進入linux系統自帶的虛擬目錄proc檢視檔案是否還存在

[root@localhost /var/lib/mysql ]# ll /proc/15010/fd | grep -i 'ib'
lrwx------ 1 root root 64 May 12 15:03 10 -> /var/lib/mysql/ibtmp1 (deleted)
lrwx------ 1 root root 64 May 12 15:03 3 -> /var/lib/mysql/ibdata1 (deleted)
lrwx------ 1 root root 64 May 12 15:03 8 -> /var/lib/mysql/ib_logfile0 (deleted)
lrwx------ 1 root root 64 May 12 15:03 9 -> /var/lib/mysql/ib_logfile1 (deleted)

4.輸入命令讓髒快速度重新整理到磁碟

mysql> set global innodb_max_dirty_pages_pct=0;

5 確保binlog pos和file不變

mysql> show master status;
+------------------+-----------+--------------+------------------+--------------------------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+-----------+--------------+------------------+--------------------------------------------------+
| mysql-bin.000176 | 449250839 | | | 6c8a10ed-ed0b-11e4-91eb-00163ec546ca:1-212063619 |
+------------------+-----------+--------------+------------------+--------------------------------------------------+
1 row in set (0.00 sec)

6.檢視engine innodb的資訊

如：
mysql> show engine innodb status\G;
*************************** 1. row ***************************
Type: InnoDB
Name:
Status:
=====================================
2016-05-12 15:25:55 0x7f7692d0e700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 10 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 35 srv_active, 0 srv_shutdown, 585 srv_idle
srv_master_thread log flush and writes: 620
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 17
OS WAIT ARRAY INFO: signal count 15
RW-shared spins 0, rounds 63, OS waits 6
RW-excl spins 0, rounds 11, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 63.00 RW-shared, 11.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 3625
Purge done for trx's n:o < 3625 undo n:o < 0 state: running but idle ==確認後臺程式吧undo log全部清除掉，事物id要一致
History list length 71
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421622043023184, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (write thread)
Pending normal aio reads: [0, 0, 0, 0] , aio writes: [0, 0, 0, 0] ,
ibuf aio reads:, log i/o's:, sync i/o's:
Pending flushes (fsync) log: 0; buffer pool: 0
459 OS file reads, 134 OS file writes, 55 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 0 merges ===合併插入 insert buffer為1
merged operations:
insert 0, delete mark 0, delete 0
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
0.00 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 14905664
Log flushed up to 14905664
Pages flushed up to 14905664
Last checkpoint at 14905655 ===確保三個日誌記錄不再變化
0 pending log flushes, 0 pending chkp writes
55 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137428992
Dictionary memory allocated 371621
Buffer pool size 8192
Free buffers 7862
Database pages 330
Old database pages 0
Modified db pages 0 ====確認髒頁書數量為0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 296, created 34, written 72
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 330, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=19640, Main thread ID=140146326370048, state: sleeping
Number of rows inserted 34, updated 0, deleted 0, read 9
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s ===確保插入更新刪除為0
----------------------------
END OF INNODB MONITOR OUTPUT
============================

1 row in set (0.00 sec)

ERROR:
No query specified

6.將檔案恢復並修改許可權

[root@localhost /proc/15010/fd ]# cp 10 /var/lib/mysql/ibtmp1
[root@localhost /proc/15010/fd ]# cp 3 /var/lib/mysql/ibdata1
[root@localhost /proc/15010/fd ]# cp 8 /var/lib/mysql/ib_logfile0
[root@localhost /proc/15010/fd ]# cp 9 /var/lib/mysql/ib_logfile1
[root@localhost /proc/15010/fd ]# chown mysql.mysql /var/lib/mysql/ibtmp1
[root@localhost /proc/15010/fd ]# chown mysql.mysql /var/lib/mysql/ibdata1
[root@localhost /proc/15010/fd ]# chown mysql.mysql /var/lib/mysql/ib_logfile*

7。重啟mysql即可

【Mysql】誤刪ibdata ib_logfile等檔案的恢復

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