Centos7實現(xiàn)MySQL基于日志還原數(shù)據(jù)的示例代碼

更新時間：2020年07月09日 10:27:42 作者：wx5ed6455937203

這篇文章主要介紹了Centos7實現(xiàn)MySQL基于日志還原數(shù)據(jù)的示例代碼，文中通過示例代碼介紹的非常詳細，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

簡介

Binlog日志，即二進制日志文件，用于記錄用戶對數(shù)據(jù)庫操作的SQL語句信息，當發(fā)生數(shù)據(jù)誤刪除的時候我們可以通過binlog日志來還原已經(jīng)刪除的數(shù)據(jù)，還原數(shù)據(jù)的方法分為傳統(tǒng)二進制文件還原數(shù)據(jù)和基于GTID的二進制文件還原數(shù)據(jù)

前期準備

準備一臺Centos7虛擬機，關(guān)閉防火墻和selinux，配置IP地址,同步系統(tǒng)時間,安裝MySQL數(shù)據(jù)庫

傳統(tǒng)二進制日志還原數(shù)據(jù)

修改配置文件

[root@localhost ~]# vi /etc/my.cnf
server-id=1
log-bin=binlog

#重啟數(shù)據(jù)庫服務(wù)
[root@localhost ~]# systemctl restart mysqld

操作數(shù)據(jù)庫

mysql> create database mydb charset utf8mb4;
mysql> use mydb;
mysql> create table test(id int)engine=innodb charset=utf8mb4;
mysql> insert into test values(1);
mysql> insert into test values(2);
mysql> insert into test values(3);
mysql> insert into test values(4);
mysql> commit;
mysql> update test set id=10 where id=4;
mysql> commit;
mysql> select * from test;
+------+
| id  |
+------+
|  1 |
|  2 |
|  3 |
|  10 |
+------+
4 rows in set (0.00 sec)
mysql> drop database mydb;

查看二進制日志信息

mysql> show master status\G;
*************************** 1. row ***************************
       File: binlog.000001
     Position: 1960
   Binlog_Do_DB: 
 Binlog_Ignore_DB: 
Executed_Gtid_Set: 
1 row in set (0.00 sec)

 
#查找創(chuàng)庫和刪庫的點,為219和1868
mysql> show binlog events in 'binlog.000001';
+---------------+------+----------------+-----------+-------------+--------------------------------------------------------------------+
| Log_name   | Pos | Event_type   | Server_id | End_log_pos | Info                                |
+---------------+------+----------------+-----------+-------------+--------------------------------------------------------------------+
| binlog.000001 | 219 | Query     |     1 |     329 | create database mydb charset utf8mb4                |
| binlog.000001 | 1868 | Query     |     1 |    1960 | drop database mydb                         |
+---------------+------+----------------+-----------+-------------+--------------------------------------------------------------------+

另存為二進制日志信息

[root@localhost ~]# mysqlbinlog --start-position=219 --stop-position=1868 /var/lib/mysql/binlog.000001 > /tmp/binlog.sql

恢復(fù)數(shù)據(jù)

#臨時關(guān)閉二進制日志記錄以免重復(fù)記錄
mysql> set sql_log_bin=0;
#恢復(fù)數(shù)據(jù)
mysql> source /tmp/binlog.sql
#重啟二進制日志記錄
mysql> set sql_log_bin=1;

查看數(shù)據(jù)恢復(fù)情況

mysql> show databases;
+--------------------+
| Database      |
+--------------------+
| information_schema |
| mydb        |
| mysql       |
| performance_schema |
| sys        |
+--------------------+
5 rows in set (0.00 sec)

mysql> use mydb;
Database changed
mysql> select * from test;
+------+
| id  |
+------+
|  1 |
|  2 |
|  3 |
|  10 |
+------+
4 rows in set (0.00 sec)、

基于GTID二進制日志還原數(shù)據(jù)

修改配置文件

[root@localhost ~]# vi /etc/my.cnf
server-id=1
log-bin=binlog
gtid_mode=ON
enforce_gtid_consistency=true
log_slave_updates=1

#重啟數(shù)據(jù)庫服務(wù)
[root@localhost ~]# systemctl restart mysqld

操作數(shù)據(jù)庫

mysql> create database mydb1;
mysql> use mydb1;
Database changed
mysql> create table t1(id int)engine=innodb charset=utf8mb4;
mysql> insert into t1 values(1);
mysql> insert into t1 values(2);
mysql> insert into t1 values(3);
mysql> insert into t1 values(11);
mysql> insert into t1 values(12);
mysql> commit;
mysql> select * from t1;
+------+
| id  |
+------+
|  1 |
|  2 |
|  3 |
|  11 |
|  12 |
+------+
5 rows in set (0.00 sec)
mysql> drop database mydb1;

查看二進制日志信息

mysql> show master status\G;
*************************** 1. row ***************************
       File: binlog.000003
     Position: 1944
   Binlog_Do_DB: 
 Binlog_Ignore_DB: 
Executed_Gtid_Set: 51d3db57-bf69-11ea-976c-000c2911a022:1-8
1 row in set (0.00 sec)

mysql> show binlog events in 'binlog.000003';
+---------------+------+----------------+-----------+-------------+-------------------------------------------------------------------+
| Log_name   | Pos | Event_type   | Server_id | End_log_pos | Info                               |
+---------------+------+----------------+-----------+-------------+-------------------------------------------------------------------+
| binlog.000003 | 154 | Gtid      |     1 |     219 | SET @@SESSION.GTID_NEXT= '51d3db57-bf69-11ea-976c-000c2911a022:1' |
| binlog.000003 | 219 | Query     |     1 |     316 | create database mydb1                       |
| binlog.000003 | 1784 | Gtid      |     1 |    1849 | SET @@SESSION.GTID_NEXT= '51d3db57-bf69-11ea-976c-000c2911a022:8' |
| binlog.000003 | 1849 | Query     |     1 |    1944 | drop database mydb1                        |
+---------------+------+----------------+-----------+-------------+-------------------------------------------------------------------+

另存為二進制日志信息

#8號事務(wù)記錄為刪除數(shù)據(jù)庫，因此只需恢復(fù)1-7號事務(wù)記錄即可
[root@localhost ~]# mysqlbinlog --skip-gtids --include-gtids='51d3db57-bf69-11ea-976c-000c2911a022:1-7' /var/lib/mysql/binlog.000003 > /tmp/gtid.sql

參數(shù)說明:
--include-gtids:包含事務(wù)
--exclude-gtids:排除事務(wù)
--skip-gtids:跳過事務(wù)

恢復(fù)數(shù)據(jù)

mysql> set sql_log_bin=0;
mysql> source /tmp/gtid.sql
mysql> set sql_log_bin=1;

查看數(shù)據(jù)恢復(fù)情況

mysql> show databases;
+--------------------+
| Database      |
+--------------------+
| information_schema |
| mydb        |
| mydb1       |
| mysql       |
| performance_schema |
| sys        |
+--------------------+
6 rows in set (0.00 sec)

mysql> use mydb1;
Database changed
mysql> select * from t1;
+------+
| id  |
+------+
|  1 |
|  2 |
|  3 |
|  11 |
|  12 |
+------+
5 rows in set (0.00 sec)

到此這篇關(guān)于Centos7實現(xiàn)MySQL基于日志還原數(shù)據(jù)的示例代碼的文章就介紹到這了,更多相關(guān)Centos7 MySQL日志還原數(shù)據(jù)內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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