mysql数据误删后的数据回滚

mysql数据误删后的数据回滚

第一步：下载MyFlash工具

# 创建文件夹
mkdir  /back_data
cd /back_data# 下载压缩包
wget https://codeload.github.com/Meituan-Dianping/MyFlash/zip/master # 安装编译相关软件
yum install gcc -y
yum install glib2 glib2-devel -y# 解压缩包
yum -y install unzip
unzip master# 进入软件目录
cd /back_data/MyFlash-master# 编译
sh build.sh#验证
cd binary
./flashback --help

如果显示

[root@localhost binary]# ll
总用量 7380
-rwxr-xr-x. 1 root root   87648 10月 31 14:20 flashback
-rwxr-xr-x. 1 root root 7463125 11月  5 2020 mysqlbinlog20160408
[root@localhost binary]# ./flashback --help
Usage:flashback [OPTION?]Help Options:-h, --help                  Show help optionsApplication Options:--databaseNames             databaseName to apply. if multiple, seperate by comma(,)--tableNames                tableName to apply. if multiple, seperate by comma(,)--tableNames-file           tableName to apply. if multiple, seperate by comma(,)--start-position            start position--stop-position             stop position--start-datetime            start time (format %Y-%m-%d %H:%M:%S)--stop-datetime             stop time (format %Y-%m-%d %H:%M:%S)--sqlTypes                  sql type to filter . support INSERT, UPDATE ,DELETE. if multiple, seperate by comma(,)--maxSplitSize              max file size after split, the uint is M--binlogFileNames           binlog files to process. if multiple, seperate by comma(,)--outBinlogFileNameBase     output binlog file name base--logLevel                  log level, available option is debug,warning,error--include-gtids             gtids to process. if multiple, seperate by comma(,)--include-gtids-file        gtids to process. if multiple, seperate by comma(,)--exclude-gtids             gtids to skip. if multiple, seperate by comma(,)--exclude-gtids-file        gtids to skip. if multiple, seperate by comma(,)[root@localhost binary]#

即安装成功!

第二步：开启binlog日志

#登录数据库 （一般或是mysql -uroot -p123456）
[root@localhost binary]# mysql -uroot
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.6.40 MySQL Community Server (GPL)Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql>#查询binlog日志是否开启mysql> show variables%log_bin%';
+---------------------------------+-------+
| Variable_name                   | Value |
+---------------------------------+-------+
| log_bin                         | OFF   |
| log_bin_basename                |       |
| log_bin_index                   |       |
| log_bin_trust_function_creators | OFF   |
| log_bin_use_v1_row_events       | OFF   |
| sql_log_bin                     | ON    |
+---------------------------------+-------+
6 rows in set (0.01 sec)mysql> SHOW VARIABLES LIKE '%binlog_row_image%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| binlog_row_image | FULL  |
+------------------+-------+
1 row in set (0.00 sec)mysql>#开启binlog日志
#第一个：binlog_format=row [root@localhost ~]# cd /etc/
[root@localhost etc]# vim my.cnf[mysqld]
log-bin=mysql-bin
binlog_format=row
server_id=1#第二个：binlog_row_image=FULL。
#默认开启#重启mysqld
[root@localhost etc]# systemctl restart mysqld

第三步：检查第二步

[root@localhost etc]# systemctl restart mysqld
[root@localhost etc]# mysql -uroot
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.40-log MySQL Community Server (GPL)Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> SHOW VARIABLES LIKE '%binlog_row_image%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| binlog_row_image | FULL  |
+------------------+-------+
1 row in set (0.00 sec)mysql> show variables like '%log_bin%';
+---------------------------------+-----------------------------------------+
| Variable_name                   | Value                                   |
+---------------------------------+-----------------------------------------+
| log_bin                         | ON                                      |
| log_bin_basename                | /application/mysql/data/mysql-bin       |
| log_bin_index                   | /application/mysql/data/mysql-bin.index |
| log_bin_trust_function_creators | OFF                                     |
| log_bin_use_v1_row_events       | OFF                                     |
| sql_log_bin                     | ON                                      |
+---------------------------------+-----------------------------------------+
6 rows in set (0.00 sec)mysql>

第四步：开始测试

基础用法

# 查看所有binglog日志
SHOW MASTER LOGS;# 当前使用的日志
show master status;# 查看日志记录
show binlog events in '日志文件名';

建立测试表

create database if EXISTS itcast;use itcast;create table tb_user(id int(11) not null,name varchar(50) not null,sex varchar(1),primary key (id)
)engine=innodb default charset=utf8;insert into tb_user(id,name,sex) values(1,'Tom','1');
insert into tb_user(id,name,sex) values(2,'Trigger','0');
insert into tb_user(id,name,sex) values(3,'Dawn','1');

第五步：误删数据库

查看删库后的binlog

第六步：新建binglog，减少外来日志影响

之后立即flush logs; 生成新的binlog

由于我们执行 flush logs 命令新生了一个文件，所以我们执行的删除的命令应该在 binlog.000001 文件里面

查看具体的命令行

show binlog events in 'mysql-bin.000001';

得到数据恢复的起始位置为 120，结束位置为 1166，

mysqlbinlog辅助恢复

接下来使用 mysqlbinlog 命令执行 binlog 文件，恢复数据，命令如下：

mysqlbinlog -v /application/mysql-5.6.40/data/mysql-bin.000001 --start-position=120 --stop-position=1166 | mysql -uroot -p123456