MySQL通过binlog日志恢复数据--误删除的表
本实验模拟生产环境误操作删除表，可利用逻辑备份和binlog恢复所删除的表。
生产库：192.168.8.31
临时库：192.168.8.32
一、数据备份
操作的前一天晚上进行了日常逻辑备份
mysqldump -uroot -pmysql -P3306 --all-databases > /mysql/backup/dump/alldb_bak.sql
二、模拟事故
模拟事故发生前后的业务情况
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| kk |
| t1 |
| t2 |
| t3 |
| t4 |
| t5 |
| t6 |
| t7 |
+----------------+
8 rows in set (0.00 sec)
mysql> desc t7;
+-------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| name | varchar(30) | YES | | NULL | |
+-------+-------------+------+-----+---------+----------------+
2 rows in set (0.00 sec)
mysql> create table t8 as select * from t7;
Query OK, 3 rows affected (0.17 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> select * from t8;
+----+--------+
| id | name |
+----+--------+
| 1 | steven |
| 3 | steven |
| 4 | steven |
+----+--------+
3 rows in set (0.00 sec)
mysql> insert into t8 select * from t7;
Query OK, 3 rows affected (0.04 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> select * from t8;
+----+--------+
| id | name |
+----+--------+
| 1 | steven |
| 3 | steven |
| 4 | steven |
| 1 | steven |
| 3 | steven |
| 4 | steven |
+----+--------+
6 rows in set (0.00 sec)
mysql> update t8 set id=2 where id=3;
Query OK, 2 rows affected (0.33 sec)
Rows matched: 2 Changed: 2 Warnings: 0
mysql> update t8 set id=3 where id=4;
Query OK, 2 rows affected (0.03 sec)
Rows matched: 2 Changed: 2 Warnings: 0
mysql> select * from t8;
+----+--------+
| id | name |
+----+--------+
| 1 | steven |
| 2 | steven |
| 3 | steven |
| 1 | steven |
| 2 | steven |
| 3 | steven |
+----+--------+
6 rows in set (0.00 sec)
mysql> drop table t8;
Query OK, 0 rows affected (0.10 sec)
三、查看当前binlog
mysql> show master status ; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000001 | 1344 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec)
四、恢复数据
拷贝生产库前一天晚上的备份文件以及备份到事故期间的binlog至临时库
scp alldb_bak.sql 192.168.8.32:/mysql/backup/dump/
scp /mysql/data/mysql-bin.000001 192.168.8.32:/mysql/backup/dump/
在临时库创建出现事故的database
mysql> create database test;
Query OK, 1 row affected (0.03 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test |
| testdb13 |
| testdb14 |
| testdb15 |
| testdb16 |
| testdb17 |
| testdb18 |
| testdb19 |
| testdb20 |
| testdb21 |
| testdb22 |
| testdb23 |
| testdb24 |
+--------------------+
17 rows in set (0.00 sec)
从备份中恢复test数据库
mysql -uroot -pmysql -P3306 -o test < alldb_bak.sql
-o是指单独恢复test库，忽略其他数据库
从mysql-bin.000001中查看到drop table t8之前的pos是1164
update t8 set id=3 where id=4 /*!*/; # at 1133 #181127 14:12:41 server id 330631 end_log_pos 1164 CRC32 0x1203751c Xid = 1661 COMMIT/*!*/; # at 1164 #181127 14:12:53 server id 330631 end_log_pos 1229 CRC32 0x48fad728 Anonymous_GTID last_committed=4 sequence_number=5 rbr_only=no SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/; # at 1229 #181127 14:12:53 server id 330631 end_log_pos 1344 CRC32 0x2a7eb0d7 Query thread_id=3 exec_time=1 error_code=0 SET TIMESTAMP=1543299173/*!*/; DROP TABLE `t8` /* generated by server */ /*!*/;
mysqlbinlog --no-defaults --stop-position=1164 --database=test mysql-bin.000001 |mysql -uroot -p test
五、根据临时库的数据，将该表恢复至生产库
六、数据验证
mysql> use test;
Database changed
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| kk |
| t1 |
| t2 |
| t3 |
| t4 |
| t5 |
| t6 |
| t7 |
| t8 |
+----------------+
9 rows in set (0.01 sec)
mysql> select * from t8;
+----+--------+
| id | name |
+----+--------+
| 1 | steven |
| 2 | steven |
| 3 | steven |
| 1 | steven |
| 2 | steven |
| 3 | steven |
+----+--------+
6 rows in set (0.00 sec)
数据恢复完毕。
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转载于:http://blog.itpub.net/30135314/viewspace-2221791/