Centos7實(shí)現(xiàn)MySQL基于日志還原數(shù)據(jù)的示例代碼
發(fā)布日期：2022-02-01 18:34 | 文章來源：CSDN
簡(jiǎn)介
Binlog日志，即二進(jìn)制日志文件，用于記錄用戶對(duì)數(shù)據(jù)庫(kù)操作的SQL語句信息，當(dāng)發(fā)生數(shù)據(jù)誤刪除的時(shí)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(jìn)制文件還原數(shù)據(jù)和基于GTID的二進(jìn)制文件還原數(shù)據(jù)
前期準(zhǔn)備
準(zhǔn)備一臺(tái)Centos7虛擬機(jī)，關(guān)閉防火墻和selinux，配置IP地址,同步系統(tǒng)時(shí)間,安裝MySQL數(shù)據(jù)庫(kù)
傳統(tǒng)二進(jìn)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(kù)服務(wù) [root@localhost ~]# systemctl restart mysqld
操作數(shù)據(jù)庫(kù)
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(jìn)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(kù)和刪庫(kù)的點(diǎn),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(jìn)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(shí)關(guān)閉二進(jìn)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(jìn)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(jìn)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(kù)服務(wù) [root@localhost ~]# systemctl restart mysqld
操作數(shù)據(jù)庫(kù)
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(jìn)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(jìn)制日志信息
#8號(hào)事務(wù)記錄為刪除數(shù)據(jù)庫(kù)，因此只需恢復(fù)1-7號(hào)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)
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