Mysql實現增量恢復的方法詳解

2024-07-25 19:08:38

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實驗介紹

增量恢復一般適用的場景：

1、人為的sql語句破壞了數據庫

2、在進行下一次完全備份之前發生系統故障導致數據庫數據丟失

3、在主從架構中，主庫數據發生了故障

丟失完全備份之后更改的數據的恢復步驟

1、首先做一個完全備份，確保生成完全備份的sql文件。

mysql> select * from yx;  #完全備份前數據庫+----------+--------+| name   | score |+----------+--------+| zhangsan | 100.00 || lisi   | 90.00 || wangwu  | 80.00 || zhaoliu | 99.00 |+----------+--------+4 rows in set (0.00 sec)[root@promote data]# mysqldump -u root -p test > /opt/test.sql  #對數據庫完全備份

2、使用flush-logs生成新的二進制日志文件，用以保存之后的數據庫操作語句。

[root@promote data]# mysqladmin -u root -p flush-logs #生成二進制文件
Enter password:
[root@promote data]# ls
auto.cnf ibdata1 ib_logfile1 mysql mysql-bin.index sys
ib_buffer_pool ib_logfile0 ibtmp1 mysql-bin.000001 performance_schema test

3、在數據庫中插入一條記錄，再執行flush-logs操作，生成新的二進制增量備份文件。

mysql> insert into yx(name,score) values('tom',87);
Query OK, 1 row affected (0.00 sec)

mysql> select * from yx;
+----------+--------+
| name     | score |
+----------+--------+
| zhangsan | 100.00 |
| lisi     | 90.00 |
| wangwu   | 80.00 |
| zhaoliu | 99.00 |
| tom      | 87.00 |
+----------+--------+
5 rows in set (0.00 sec)
[root@promote data]# mysqladmin -u root -p flush-logs #生成二進制文件
Enter password:
[root@promote data]# ls
auto.cnf        ibdata1      ib_logfile1 mysql             mysql-bin.000002 performance_schema test
ib_buffer_pool ib_logfile0 ibtmp1       mysql-bin.000001 mysql-bin.index   sys

4、用delete刪除剛才插入的數據。模擬完全備份后數據丟失。

mysql> delete from yx where name='tom';
Query OK, 1 row affected (0.00 sec)

mysql> select * from yx;
+----------+--------+
| name     | score |
+----------+--------+
| zhangsan | 100.00 |
| lisi     | 90.00 |
| wangwu   | 80.00 |
| zhaoliu | 99.00 |
+----------+--------+
4 rows in set (0.00 sec)

5、使用二進制文件進行恢復操作

[root@promote data]# mysqlbinlog --no-defaults mysql-bin.000001 | mysql -u root -p

6、查看數據庫內容，刪除的數據有了。說明數據恢復成功。

mysql> select * from yx;
+----------+--------+
| name     | score |
+----------+--------+
| zhangsan | 100.00 |
| lisi     | 90.00 |
| wangwu   | 80.00 |
| zhaoliu | 99.00 |
| tom      | 87.00 |
+----------+--------+
5 rows in set (0.00 sec）

完全備份之后丟失所有數據的恢復步驟

1、使用drop刪除表yx，模擬數據完全丟失

mysql> drop table yx;
Query OK, 0 rows affected (0.01 sec)

mysql> show tables;
Empty set (0.00 sec)

2、先使用mysql命令進行完全備份恢復操作。

[root@promote data]# mysql -u root -p test < /opt/test.sql
mysql> use test;
Database changed
mysql> select * from yx;
+----------+--------+
| name     | score |
+----------+--------+
| zhangsan | 100.00 |
| lisi     | 90.00 |
| wangwu   | 80.00 |
| zhaoliu | 99.00 |
+----------+--------+
4 rows in set (0.00 sec)

3、使用二進制文件進行增量備份操作。

[root@promote data]# mysqlbinlog --no-defaults mysql-bin.000001 | mysql -u root -p
mysql> select * from yx;
+----------+--------+
| name     | score |
+----------+--------+
| zhangsan | 100.00 |
| lisi     | 90.00 |
| wangwu   | 80.00 |
| zhaoliu | 99.00 |
| tom      | 87.00 |
+----------+--------+
5 rows in set (0.00 sec)

基于時間點與位置的恢復

利用二進制日志實現局域時間點與位置的恢復，假如需要往數據庫中插入兩條數據，但是由于誤操作，兩條插入語句中間刪除一條數據，而這條數據不應該刪除，這時候，需要基于時間點與位置進行恢復。

–start-datetime=datetime

從二進制日志中第1個日期時間等于或晚于datetime參量的事件開始讀。

–stop-datetime=datetime
從二進制日志中第1個日期時間等于或晚于datetime參量的事件起停止讀。

–start-position=N
從二進制日志中第1個位置等于N參量時的事件開始讀。

–stop-position=N
從二進制日志中第1個位置等于和大于N參量時的事件起停止讀。

mysql> select * from yx;
+----------+--------+
| name     | score |
+----------+--------+
| zhangsan | 100.00 |
| lisi     | 90.00 |
| wangwu   | 80.00 |
| zhaoliu | 99.00 |
+----------+--------+
5 rows in set (0.00 sec)

mysql> insert into yx values('test01',87);
Query OK, 1 row affected (0.00 sec)

mysql> delete from yx where name='zhangsan';
Query OK, 1 row affected (0.00 sec)

mysql> insert into yx values('test02',99);
Query OK, 1 row affected (0.17 sec)

mysql> select * from yx;
+---------+-------+
| name | score |
+---------+-------+
| lisi | 90.00 |
| wangwu | 80.00 |
| zhaoliu | 99.00 |
| test01 | 87.00 |
| test02 | 99.00 |
+---------+-------+
6 rows in set (0.00 sec)

1、基于時間點的恢復。18-07-03 21:56:04是錯誤語句節點，18-07-03 21:56:11第二句正確語句節點

[root@promote data]# mysqlbinlog --no-defaults --base64-output=decode-rows mysql-bin.000003
# at 298
#180703 21:55:35 server id 1 end_log_pos 406 CRC32 0x257c67ab Query   thread_id=46    exec_time=0 error_code=0
use `test`/*!*/;
SET TIMESTAMP=1530626135/*!*/;
insert into yx values('test01',87)
/*!*/;
# at 406
#180703 21:55:35 server id 1 end_log_pos 437 CRC32 0xdd7913a3 Xid = 392
COMMIT/*!*/;
# at 437
#180703 21:56:04 server id 1 end_log_pos 502 CRC32 0x0d09bd0b Anonymous_GTID last_committed=1    sequence_number=2
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 502
#180703 21:56:04 server id 1 end_log_pos 581 CRC32 0xe6040c79 Query   thread_id=46    exec_time=0 error_code=0
SET TIMESTAMP=1530626164/*!*/;
BEGIN
/*!*/;
# at 581
#180703 21:56:04 server id 1 end_log_pos 691 CRC32 0x2d99f699 Query   thread_id=46    exec_time=0 error_code=0
SET TIMESTAMP=1530626164/*!*/;
delete from yx where name='zhangsan'
/*!*/;
# at 691
#180703 21:56:04 server id 1 end_log_pos 722 CRC32 0x4a742173 Xid = 393
COMMIT/*!*/;
# at 722
#180703 21:56:11 server id 1 end_log_pos 787 CRC32 0x6d0b47d8 Anonymous_GTID last_committed=2    sequence_number=3
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 787
#180703 21:56:11 server id 1 end_log_pos 866 CRC32 0x97e2deb7 Query   thread_id=46    exec_time=0 error_code=0
SET TIMESTAMP=1530626171/*!*/;
BEGIN
/*!*/;
# at 866
#180703 21:56:11 server id 1 end_log_pos 974 CRC32 0x9e24e8af Query   thread_id=46    exec_time=0 error_code=0
SET TIMESTAMP=1530626171/*!*/;
insert into yx values('test02',99)
[root@promote data]# mysql -u root -p test < /opt/test.sql   #先進行完全恢復
mysql> select * from yx;
+----------+--------+
| name     | score |
+----------+--------+
| zhangsan | 100.00 |
| lisi     | 90.00 |
| wangwu   | 80.00 |
| zhaoliu | 99.00 |
+----------+--------+
4 rows in set (0.00 sec)
[root@promote data]# mysqlbinlog --no-defaults --stop-datetime='18-07-03 21:56:04' mysql-bin.000003 | mysql -u root -p   #結束節點
Enter password:
[root@promote data]# mysqlbinlog --no-defaults --start-datetime='18-07-03 21:56:11' mysql-bin.000003 | mysql -u root -p   #重新開始節點
Enter password:
mysql> select * from yx;
+----------+--------+
| name     | score |
+----------+--------+
| zhangsan | 100.00 |
| lisi     | 90.00 |
| wangwu   | 80.00 |
| zhaoliu | 99.00 |
| test01   | 87.00 |
| test02   | 99.00 |
+----------+--------+
6 rows in set (0.00 sec)

2、基于位置恢復，其中581是錯誤語句的節點，866是第二句正確語句的節點

[root@promote data]# mysql -u root -p test < /opt/test.sql
mysql> select * from yx;
+----------+--------+
| name     | score |
+----------+--------+
| zhangsan | 100.00 |
| lisi     | 90.00 |
| wangwu   | 80.00 |
| zhaoliu | 99.00 |
+----------+--------+
4 rows in set (0.01 sec)
[root@promote data]# mysqlbinlog --no-defaults --stop-position='581' mysql-bin.000003 | mysql -u root -p
Enter password:
[root@promote data]# mysqlbinlog --no-defaults --start-position='866' mysql-bin.000003 | mysql -u root -p
Enter password:
mysql> select * from yx;
+----------+--------+
| name     | score |
+----------+--------+
| zhangsan | 100.00 |
| lisi     | 90.00 |
| wangwu   | 80.00 |
| zhaoliu | 99.00 |
| test01   | 87.00 |
| test02   | 99.00 |
+----------+--------+
6 rows in set (0.00 sec)