mysql数据库被删除怎么恢复

2025-01-24 11:28:30
推荐回答(2个)
回答1:

1 找个别的机器安装个同版本的mysql或从已安装同版本的其他机器上(非同版本的也可以试下):
拷贝 mysql/data/mysql 目录到你的mysql/data/ 下吧
2 试着启动mysql服务,如果能启动了,理论上应该丢失的只有用户、授权等一些系统信息,不影响你的使用的数据;
如果不能启动,看错误日志,争取启动了。
3 赶紧把数据备份一份出来,重新把所有库(只是你后来创建的业务相关的库,不包括mysql库)都删了,重新导入一遍。理论上不这样也可以,但只是非生产重要的环境下。
4 重新做用户授权。

回答2:

每个 DBA 是不是都有过删库的经历?删库了没有备份怎么办?备份恢复后无法启动服务什么情况?表定义损坏数据无法读取怎么办? 

我曾遇到某初创互联网企业,因维护人员不规范的备份恢复操作,导致系统表空间文件被初始化,上万张表无法读取,花了数小时才抢救回来。

当你发现数据无法读取时,也许并非数据丢失了,可能是 DBMS 找不到描述数据的信息。


背景

先来了解下几张关键的 InnoDB 数据字典表,它们保存了部分表定义信息,在我们恢复表结构时需要用到。

SYS_TABLES 描述 InnoDB 表信息CREATE TABLE `SYS_TABLES` (`NAME` varchar(255) NOT NULL DEFAULT '',  表名`ID` bigint(20) unsigned NOT NULL DEFAULT '0',  表id`N_COLS` int(10) DEFAULT NULL,`TYPE` int(10) unsigned DEFAULT NULL,`MIX_ID` bigint(20) unsigned DEFAULT NULL,`MIX_LEN` int(10) unsigned DEFAULT NULL,`CLUSTER_NAME` varchar(255) DEFAULT NULL,`SPACE` int(10) unsigned DEFAULT NULL,   表空间idPRIMARY KEY (`NAME`)) ENGINE=InnoDB DEFAULT CHARSET=latin1;SYS_INDEXES 描述 InnoDB 索引信息CREATE TABLE `SYS_INDEXES` (  `TABLE_ID` bigint(20) unsigned NOT NULL DEFAULT '0', 与sys_tables的id对应  `ID` bigint(20) unsigned NOT NULL DEFAULT '0',  索引id  `NAME` varchar(120) DEFAULT NULL,         索引名称  `N_FIELDS` int(10) unsigned DEFAULT NULL, 索引包含字段的个数  `TYPE` int(10) unsigned DEFAULT NULL,  `SPACE` int(10) unsigned DEFAULT NULL,  存储索引的表空间id  `PAGE_NO` int(10) unsigned DEFAULT NULL,  索引的root page id  PRIMARY KEY (`TABLE_ID`,`ID`)) ENGINE=InnoDB DEFAULT CHARSET=latin1;SYS_COLUMNS 描述 InnoDB 表的字段信息CREATE TABLE `SYS_COLUMNS` (  `TABLE_ID` bigint(20) unsigned NOT NULL, 与sys_tables的id对应  `POS` int(10) unsigned NOT NULL,     字段相对位置  `NAME` varchar(255) DEFAULT NULL,    字段名称  `MTYPE` int(10) unsigned DEFAULT NULL,  字段编码  `PRTYPE` int(10) unsigned DEFAULT NULL, 字段校验类型  `LEN` int(10) unsigned DEFAULT NULL,  字段字节长度  `PREC` int(10) unsigned DEFAULT NULL, 字段精度  PRIMARY KEY (`TABLE_ID`,`POS`)) ENGINE=InnoDB DEFAULT CHARSET=latin1;SYS_FIELDS 描述全部索引的字段列CREATE TABLE `SYS_FIELDS` (  `INDEX_ID` bigint(20) unsigned NOT NULL,  `POS` int(10) unsigned NOT NULL,  `COL_NAME` varchar(255) DEFAULT NULL,  PRIMARY KEY (`INDEX_ID`,`POS`)) ENGINE=InnoDB DEFAULT CHARSET=latin1;./storage/innobase/include/dict0boot.h 文件定义了每个字典表的 index id,对应 id 的 page 中存储着字典表的数据。

这里我们需要借助 undrop-for-innodb 工具恢复数据,它能读取表空间信息得到 page,将数据从 page 中提取出来。

# wget https://github.com/chhabhaiya/undrop-for-innodb/archive/master.zip# yum install -y gcc flex bison# make# make sys_parser

# ./sys_parser 读取表结构信息

sys_parser [-h] [-u] [-p] [-d] databases/table

stream_parser 读取 InnoDB page 从 ibdata1 或 ibd 或分区表

# ./stream_parserYou must specify file with -f optionUsage: ./stream_parser -f [-T N:M] [-s size] [-t size] [-V|-g]  Where:    -h         - Print this help    -V or -g   - Print debug information    -s size    - Amount of memory used for disk cache (allowed examples 1G 10M). Default 100M    -T         - retrieves only pages with index id = NM (N - high word, M - low word of id)    -t size    - Size of InnoDB tablespace to scan. Use it only if the parser can't determine it by himself.

c_parser 从 innodb page 中读取记录保存到文件

# ./c_parserError: Usage: ./c_parser -4|-5|-6 [-dDV] -f -t table.sql [-T N:M] [-b ]  Where    -f -- InnoDB page or directory with pages(all pages should have same index_id)    -t -- CREATE statement of a table    -o -- Save dump in this file. Otherwise print to stdout    -l -- Save SQL statements in this file. Otherwise print to stderr    -h  -- Print this help    -d  -- Process only those pages which potentially could have deleted records (default = NO)    -D  -- Recover deleted rows only (default = NO)    -U  -- Recover UNdeleted rows only (default = YES)    -V  -- Verbose mode (lots of debug information)    -4  -- innodb_datafile is in REDUNDANT format    -5  -- innodb_datafile is in COMPACT format    -6  -- innodb_datafile is in MySQL 5.6 format    -T  -- retrieves only pages with index id = NM (N - high word, M - low word of id)    -b

-- Directory where external pages can be found. Usually it is pages-XXX/FIL_PAGE_TYPE_BLOB/    -i -- Read external pages at their offsets from .    -p prefix -- Use prefix for a directory name in LOAD DATA INFILE command



接下来,我们演示场景的几种数据恢复场景。

场景1:drop table

是否启用了 innodb_file_per_table 其恢复方法有所差异,当发生误删表时,应尽快停止MySQL服务,不要启动。若 innodb_file_per_table=ON,最好只读方式重新挂载文件系统,防止其他进程写入数据覆盖之前块设备的数据。

如果评估记录是否被覆盖,可以表中某些记录的作为关键字看是否能从 ibdata1 中筛选出。

# grep WOODYHOFFMAN ibdata1

Binary file ibdata1 matches

也可以使用 bvi(适用于较小文件)或 hexdump -C(适用于较大文件)工具

以表 sakila.actor 为例CREATE TABLE `actor` (`actor_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,`first_name` varchar(45) NOT NULL,`last_name` varchar(45) NOT NULL,`last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,PRIMARY KEY (`actor_id`),KEY `idx_actor_last_name` (`last_name`)) ENGINE=InnoDB AUTO_INCREMENT=201 DEFAULT CHARSET=utf8

首先恢复表结构信息1. 解析系统表空间获取 page 信息

./stream_parser -f /var/lib/mysql/ibdata1

2. 新建一个 schema,把系统字典表的 DDL 导入

cat dictionary/SYS_* | mysql recovered

3. 创建恢复目录

mkdir -p dumps/default

4. 解析系统表空间包含的字典表信息,

./c_parser -4f pages-ibdata1/FIL_PAGE_INDEX/0000000000000001.page -t dictionary/SYS_TABLES.sql > dumps/default/SYS_TABLES 2> dumps/default/SYS_TABLES.sql./c_parser -4f pages-ibdata1/FIL_PAGE_INDEX/0000000000000002.page -t dictionary/SYS_COLUMNS.sql > dumps/default/SYS_COLUMNS 2> dumps/default/SYS_COLUMNS.sql./c_parser -4f pages-ibdata1/FIL_PAGE_INDEX/0000000000000003.page -t dictionary/SYS_INDEXES.sql > dumps/default/SYS_INDEXES 2> dumps/default/SYS_INDEXES.sql./c_parser -4f pages-ibdata1/FIL_PAGE_INDEX/0000000000000004.page -t dictionary/SYS_FIELDS.sql > dumps/default/SYS_FIELDS 2> dumps/default/SYS_FIELDS.sql

5. 导入恢复的数据字典

cat dumps/default/*.sql | mysql recovered

6. 读取恢复后的表结构信息

./sys_parser -pmsandbox -d recovered sakila/actor

由于 5.x 版本 innodb 引擎并非完整记录表结构信息,会丢失 AUTO_INCREMENT 属性、二级索引和外键约束, DECIMAL 精度等信息。

若是 mysql 5.5 版本 frm 文件被从系统删除,在原目录下 touch 与原表名相同的 frm 文件,还能读取表结构信息和数据。若只有 frm 文件,想要获得表结构信息,可使用 mysqlfrm --diagnostic /path/to/xxx.frm,连接 mysql 会显示字符集信息。


  • innodb_file_per_table=OFF

  • 因为是共享表空间模式,数据页都存储在 ibdata1,可以从 ibdata1 文件中提取数据。

  • 1. 获取表的 table id,sys_table 存有表的 table id,sys_table 表 index id 是1,所以从0000000000000001.page 获取表 id./c_parser -4Df pages-ibdata1/FIL_PAGE_INDEX/0000000000000001.page -t dictionary/SYS_TABLES.sql | grep sakila/actor000000000B28  2A000001430D4D  SYS_TABLES  "sakila/actor"  158  4  1 0   0   ""  0000000000B28  2A000001430D4D  SYS_TABLES  "sakila/actor"  158  4  1 0   0   ""  0


  • 2. 利用 table id 获取表的主键 id,sys_indexes 存有表索引信息,innodb 索引组织表,找到主键 id 即找到数据,sys_indexes 的 index id 是3,所以从0000000000000003.page 获取主键 id

  • ./c_parser -4Df pages-ibdata1/FIL_PAGE_INDEX/0000000000000003.page -t dictionary/SYS_INDEXES.sql | grep 158000000000B28    2A000001430BCA  SYS_INDEXES     158     376     "PRIMARY"       1       3       0       4294967295000000000B28    2A000001430C3C  SYS_INDEXES     158     377     "idx_actor_last_name"        1       0       0       4294967295000000000B28    2A000001430BCA  SYS_INDEXES     158     376     "PRIMARY"       1       3       0       4294967295000000000B28    2A000001430C3C  SYS_INDEXES     158     377     "idx_actor_last_name"        1       0       0       4294967295


  • 3. 知道了主键 id,就可以从对应 page 中提取表数据,并生成 sql 文件。

  • ./c_parser -4f pages-ibdata1/FIL_PAGE_INDEX/0000000000000376.page -t sakila/actor.sql > dumps/default/actor 2> dumps/default/actor_load.sql


  • 4. 最后导入恢复的数据

  • cat dumps/default/*.sql | mysql sakila

  • 更多详细情况点击网页链接

  • 请点击输入图片描述

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