Mysql中误删ibdataib_logfile等文件怎么办

这篇文章主要介绍了MySQL中误删ibdata ib_logfile等文件怎么办，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。

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背景：误删ibdata等文件

1. [root@localhost /var/lib/mysql ]# rm -rf ib*

2. ib_buffer_pool  ibdata1         ib_logfile0     ib_logfile1     ibtmp1

此时不要惊慌，因为mysql还是在运行的，也行进行操作，，如果关了mysql那就没办法了，恢复步骤如下
1.关闭所有业务写入

1. flush tables with read lock

2.查看mysql的pid号

1. [root@localhost /var/lib/mysql ]# ps -ef | grep -i mysql

2. root       386     1  0 May06 ? 00:00:00 /bin/sh /usr/local/mariadb/bin/mysqld_safe --defaults-file=/usr/local/mariadb/my.cnf

3. 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

4. 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

5. mysql 1501014790  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

6. root     18180 17974  0 15:03 pts/3    00:00:00 grep -i mysql

7. [root@localhost /var/lib/mysql ]# netstat -nputl|grep -i mysql

8. tcp        0      0 :::3333 :::* LISTEN      491/mysqld

9. tcp        0      0 :::3306 :::* LISTEN 15010/mysqld

3 进入linux系统自带的虚拟目录proc查看文件是否还存在

1. [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.输入命令让脏快速度刷新到磁盘

1. mysql> set global innodb_max_dirty_pages_pct=0;

5 确保binlog pos和file不变

1. mysql> show master status;

2. +------------------+-----------+--------------+------------------+--------------------------------------------------+

3. | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

4. +------------------+-----------+--------------+------------------+--------------------------------------------------+

5. | mysql-bin.000176 | 449250839 | | | 6c8a10ed-ed0b-11e4-91eb-00163ec546ca:1-212063619 |

6. +------------------+-----------+--------------+------------------+--------------------------------------------------+

7. 1 row in set (0.00 sec)

6.查看engine innodb的信息

1. 如：

2. 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   ==确认后台进程吧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         ===合并插入 insert buffer为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                          ===确保三个日志记录不再变化
   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          ====确认脏页书数量为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            ===确保插入 更新 删除为0
   ----------------------------
   END OF INNODB MONITOR OUTPUT
   ============================
   
   
   1 row in set (0.00 sec)
   
   
   ERROR: 
   No query specified
   

6.将文件恢复并修改权限

1. [root@localhost /proc/15010/fd ]# cp 10 /var/lib/mysql/ibtmp1

2. [root@localhost /proc/15010/fd ]# cp 3 /var/lib/mysql/ibdata1

3. [root@localhost /proc/15010/fd ]# cp 8 /var/lib/mysql/ib_logfile0

4. [root@localhost /proc/15010/fd ]# cp 9 /var/lib/mysql/ib_logfile1

5. [root@localhost /proc/15010/fd ]# chown mysql.mysql /var/lib/mysql/ibtmp1

6. [root@localhost /proc/15010/fd ]# chown mysql.mysql /var/lib/mysql/ibdata1

7. [root@localhost /proc/15010/fd ]# chown mysql.mysql /var/lib/mysql/ib_logfile*

7。重启mysql即可

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