记一次mysql的数据恢复
记一次mysql完备+binlog日志恢复
一.准备工作
首先创建一个测试库，然后插入一部分数据
root@localhost:(none) 14:06:13>create database test;
Query OK, 1 row affected (0.00 sec)
root@localhost:(none) 14:07:58>create table test.t1(id int,name char(10),sex enum("boy","girl"));
Query OK, 0 rows affected (0.01 sec)
root@localhost:(none) 14:08:58>insert into test.t1 values(1,"haha","boy");
Query OK, 1 row affected (0.00 sec)
root@localhost:(none) 14:09:06>insert into test.t1 values(2,"hehe","girl");
Query OK, 1 row affected (0.00 sec)
root@localhost:(none) 14:09:18>insert into test.t1 values(3,"xixi","boy");
Query OK, 1 row affected (0.00 sec)
root@localhost:(none) 14:09:29>select * from test.t1;
+------+------+------+
| id | name | sex |
+------+------+------+
| 1 | haha | boy |
| 2 | hehe | girl |
| 3 | xixi | boy |
+------+------+------+
3 rows in set (0.00 sec)
二. 做一次完整的备份
加上–master-data选项可以记录偏移量，方便我们使用binlog日志恢复
[root@master ~]# mysqldump --master-data -A -p > all.sql
Enter password:
三.进入数据库插入一部分数据
root@localhost:test 14:16:12>insert into test.t1 values(4,"aa","boy");
Query OK, 1 row affected (0.00 sec)
root@localhost:test 14:16:27>insert into test.t1 values(5,"bb","girl");
Query OK, 1 row affected (0.00 sec)
刷新下binlog日志然后在插入一些数据
root@localhost:test 14:16:39>flush logs;
Query OK, 0 rows affected (0.03 sec)
root@localhost:test 14:17:16>insert into test.t1 values(6,"cc","girl");
Query OK, 1 row affected (0.00 sec)
root@localhost:test 14:17:25>insert into test.t1 values(7,"dd","boy");
Query OK, 1 row affected (0.01 sec)
现在test数据库总共有7条记录
四.模拟误操作删除了数据库
root@localhost:test 14:17:34>drop database test;
Query OK, 1 row affected (0.00 sec)
root@localhost:(none) 14:20:17>show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.00 sec)
五.开始恢复操作
首先恢复我们首次的完整备份
[root@master ~]# mysql -p < all.sql
root@localhost:(none) 14:21:16>select * from test.t1;
+------+------+------+
| id | name | sex |
+------+------+------+
| 1 | haha | boy |
| 2 | hehe | girl |
| 3 | xixi | boy |
+------+------+------+
3 rows in set (0.00 sec)
可以看到我们首次备份的三条数据已经还原了，然后我们使用binlog日志恢复
查看我们首次完整备份记录的binlog日志和偏移量
[root@master ~]# grep "CHANGE MASTER TO" all.sql | head -1
CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000003', MASTER_LOG_POS=1532629;
查看我们的binlog日志存放路径，把需要恢复的binlog日志复制到临时恢复目录，注意一定要复制出去
[root@master ~]# cd /data/mysql/log/
[root@master log]# ls
error.log mysql-bin.000001 mysql-bin.000002 mysql-bin.000003 mysql-bin.000004 mysql-bin.index relay.000001 relay.index slow.log test1.sql
[root@master log]# cp mysql-bin.000003 mysql-bin.000004 /tmp/
然后使用binlog日志恢复数据
[root@master tmp]# mysqlbinlog --start-position='1532629' /tmp/mysql-bin.000003 | mysql -p
root@localhost:(none) 14:33:28>select * from test.t1;
+------+------+------+
| id | name | sex |
+------+------+------+
| 1 | haha | boy |
| 2 | hehe | girl |
| 3 | xixi | boy |
| 4 | aa | boy |
| 5 | bb | girl |
+------+------+------+
5 rows in set (0.01 sec)
然后我们查看下我们之前删除数据库的pos点
[root@master tmp]# mysqlbinlog mysql-bin.000004 | grep -5 "drop database"
#200520 14:18:16 server id 1 end_log_pos 874 CRC32 0x060a83aa Anonymous_GTID last_committed=2 sequence_number=3 rbr_only=no
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 874
#200520 14:18:16 server id 1 end_log_pos 966 CRC32 0x9cdc4cbc Query thread_id=16 exec_time=0 error_code=0
SET TIMESTAMP=1589955496/*!*/;
drop database test
/*!*/;
# at 966
#200520 14:20:51 server id 1 end_log_pos 1031 CRC32 0x726d7410 Anonymous_GTID last_committed=3 sequence_number=4 rbr_only=no
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 1031
从这里可以看出我们删除数据之前最后的pos点是874，然后只用最后的binlog日志恢复数据
[root@master tmp]# mysqlbinlog --stop-position='874' mysql-bin.000004 | mysql -p
root@localhost:(none) 14:37:26>select * from test.t1;
+------+------+------+
| id | name | sex |
+------+------+------+
| 1 | haha | boy |
| 2 | hehe | girl |
| 3 | xixi | boy |
| 4 | aa | boy |
| 5 | bb | girl |
| 6 | cc | girl |
| 7 | dd | boy |
+------+------+------+
7 rows in set (0.00 sec)
到此我们可以看到所有的7条数据已全部恢复