误删除InnoDB ibdata数据文件怎么办
发布时间：2022-01-04 09:26:56 所属栏目：MySql教程 来源：互联网
导读：这篇文章主要介绍了误删除InnoDB ibdata数据文件怎么办，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。 下边这个案例模拟人为误删除数据文件和重做日志文件。 1)删除数据文件和重做日
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这篇文章主要介绍了误删除InnoDB ibdata数据文件怎么办，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。 下边这个案例模拟人为误删除数据文件和重做日志文件。 1)删除数据文件和重做日志文件 cd /mysql/data rm -rf ib* 2)若此时数据库可以正常工作，数据可以正常写入，千万不要将mysqld杀死，否则没法挽救，找到mysqld的pid [root@mysql data]# netstat -nltp |grep mysqld tcp 0 0 :::3306 :::* LISTEN 29691/mysqld 这里是29691 [root@mysql mysql]# ll /proc/29691/fd |egrep 'ib_|ibdata' lrwx------ 1 root root 64 Aug 8 13:32 10 -> /mysql/ib_logfile1 (deleted) lrwx------ 1 root root 64 Aug 8 13:32 4 -> /mysql/ibdata1 (deleted) lrwx------ 1 root root 64 Aug 8 13:32 9 -> /mysql/ib_logfile0 (deleted) 10,4,9就是需要我们恢复的文件。 3)关闭前端业务或者执行： flush tables with read lock; 目的是让数据库没有写入操作。 4)执行以下命令使脏页尽快刷入磁盘 set global innodb_max_dirty_pages_pct=0; 5)然后查看binlog日志写入情况，确保file和position的值没有变化。 mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000004 | 980 | | | | +------------------+----------+--------------+------------------+-------------------+ 6)查看InnoDB状态信息，确保脏页已经刷入磁盘。 mysql> show engine innodb status G *************************** 1. row *************************** Type: InnoDB Name: Status: ===================================== 2017-08-08 13:46:24 7f4d3e2b2700 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 10 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 3 srv_active, 0 srv_shutdown, 8043 srv_idle srv_master_thread log flush and writes: 8046 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 9 OS WAIT ARRAY INFO: signal count 9 Mutex spin waits 2, rounds 60, OS waits 2 RW-shared spins 6, rounds 180, OS waits 6 RW-excl spins 0, rounds 30, OS waits 1 Spin rounds per wait: 30.00 mutex, 30.00 RW-shared, 30.00 RW-excl ------------ TRANSACTIONS ------------ Trx id counter 31247 Purge done for trx's n:o < 31242 undo n:o < 0 state: running but idle ##确保后天purge进程把undo log全部清除掉，事务ID要一致 History list length 969 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 0, not started MySQL thread id 4, OS thread handle 0x7f4d3e230700, query id 151 10.10.10.1 root ---TRANSACTION 31246, not started MySQL thread id 2, OS thread handle 0x7f4d3e2b2700, query id 160 localhost root init show engine innodb status -------- FILE I/O -------- I/O thread 0 state: waiting for i/o request (insert buffer thread) I/O thread 1 state: waiting for i/o request (log thread) I/O thread 2 state: waiting for i/o request (read thread) I/O thread 3 state: waiting for i/o request (read thread) I/O thread 4 state: waiting for i/o request (read thread) I/O thread 5 state: waiting for i/o request (read thread) I/O thread 6 state: waiting for i/o request (write thread) I/O thread 7 state: waiting for i/o request (write thread) I/O thread 8 state: waiting for i/o request (write thread) I/O thread 9 state: waiting for i/o request (write thread) Pending normal aio reads: 0 [0, 0, 0, 0] , aio writes: 0 [0, 0, 0, 0] , ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0 Pending flushes (fsync) log: 0; buffer pool: 0 404 OS file reads, 25 OS file writes, 22 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 ##insert buffer合并插入缓存等于1 merged operations: insert 0, delete mark 0, delete 0 discarded operations: insert 0, delete mark 0, delete 0 Hash table size 276671, node heap has 2 buffer(s) 0.00 hash searches/s, 0.00 non-hash searches/s --- LOG --- Log sequence number 3401065960 Log flushed up to 3401065960 Pages flushed up to 3401065960 Last checkpoint at 3401065960 ##确保这4个值不在变化 0 pending log writes, 0 pending chkp writes 16 log i/o's done, 0.00 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total memory allocated 137363456; in additional pool allocated 0 Dictionary memory allocated 63833 Buffer pool size 8191 Free buffers 7802 Database pages 387 Old database pages 0 Modified db pages 0 ##确保脏页数量为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 387, created 0, written 10 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: 387, 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 Main thread process no. 29691, id 139969685923584, state: sleeping Number of rows inserted 1, updated 1, deleted 0, read 31 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 (0.03 sec) 7)开始恢复工作 [root@mysql mysql]# ll /proc/29691/fd |egrep 'ib_|ibdata' lrwx------ 1 root root 64 Aug 8 13:32 10 -> /mysql/ib_logfile1 (deleted) lrwx------ 1 root root 64 Aug 8 13:32 4 -> /mysql/ibdata1 (deleted) lrwx------ 1 root root 64 Aug 8 13:32 9 -> /mysql/ib_logfile0 (deleted) cd /proc/29691/fd cp 10 /mysql/ib_logfile1 cp 4 /mysql/ibdata1 cp 9 /mysql/ib_logfile0 8)更改数据文件和重做日志文件权限 cd /mysql/ chown mysql:mysql ib* 9)重启MySQL服务 （编辑：云计算网_泰州站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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