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
[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
恢復數(shù)據(jù)
#臨時關閉二進制日志記錄以免重復記錄
mysql> set sql_log_bin=0;
#恢復數(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
[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號事務記錄為刪除數(shù)據(jù)庫，因此只需恢復1-7號事務記錄即可
[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
--exclude-gtids:排除事務
--skip-gtids:跳過事務
恢復數(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)瀏覽下面的相關文章希望大家以后多多支持腳本之家！
