欧美bbbwbbbw肥妇,免费乱码人妻系列日韩,一级黄片

如何利用MySQL的binlog恢復誤刪數(shù)據(jù)庫詳解

 更新時間：2021年09月28日 11:32:07   作者：Honest1y  
MySQL一旦誤刪數(shù)據(jù)庫之后恢復數(shù)據(jù)很麻煩,這里記錄一下艱辛的恢復過程,這篇文章主要給大家介紹了關于如何利用MySQL的binlog恢復誤刪數(shù)據(jù)庫的相關資料,需要的朋友可以參考下

1 查看當前數(shù)據(jù)庫內容并備份數(shù)據(jù)庫

查看數(shù)據(jù)庫信息：

備份數(shù)據(jù)庫：

[root@localhost ~]# mysqldump -u root -p t > /mnt/t.sql
Enter password: 
[root@localhost ~]# ll /mnt/t.sql 
-rw-r--r-- 1 root root 1771 Aug 25 11:56 /mnt/t.sql

2 開啟bin_log功能

首先查看數(shù)據(jù)庫是否開啟bin_log功能

mysql> show variables like "%log_bin%";

需要修改mysql的配置文件，/etc/的my.cnf，添加一句log_bin = mysql_bin即可

3 模擬誤操作（插入3條數(shù)據(jù)，刪除數(shù)據(jù)庫）

mysql> insert into t1 values (3);
Query OK, 1 row affected (0.00 sec)

mysql> insert into t1 values (4);
Query OK, 1 row affected (0.00 sec)

mysql> insert into t1 values (5);
Query OK, 1 row affected (0.00 sec)

mysql> select * from t1;
+------+
| id   |
+------+
|    1 |
|    2 |
|    5 |
|    4 |
|    3 |
+------+
5 rows in set (0.00 sec)

mysql> flush logs;
Query OK, 0 rows affected (0.00 sec)

mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql_bin.000003 |      106 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

刪除數(shù)據(jù)：

mysql> truncate t1;
Query OK, 0 rows affected (0.00 sec)

mysql> select * from t1;
Empty set (0.00 sec)

此時突然數(shù)據(jù)庫損壞或者人為刪除

mysql> drop table t1;
Query OK, 0 rows affected (0.00 sec)

mysql> show tables;
Empty set (0.00 sec)

4 數(shù)據(jù)恢復

1 用已經(jīng)備份的/mnt/t.sql來恢復數(shù)據(jù)

mysql> source /mnt/t.sql;
Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.01 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 2 rows affected (0.00 sec)
Records: 2  Duplicates: 0  Warnings: 0

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)
mysql> show tables;
+-------------+
| Tables_in_t |
+-------------+
| t1          |
+-------------+
1 row in set (0.00 sec)

mysql> select * from t1;
+------+
| id   |
+------+
|    1 |
|    2 |
+------+
2 rows in set (0.00 sec)

2 還有三條數(shù)據(jù)沒有恢復，怎么辦。只能用bin-log來恢復

[root@localhost ~]# mysqlbinlog --no-defaults /var/lib/mysql/mysql_bin.000002 | mysql -u root -p123.com t

mysql> use t;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from t1;
+------+
| id   |
+------+
|    1 |
|    2 |
|    3 |
|    4 |
|    5 |
+------+
5 rows in set (0.00 sec)

mysql>

5 總結

備份數(shù)據(jù)

mysqldump -uroot -p123456 test -l -F '/tmp/test.sql'
-l:讀鎖（只能讀取，不能更新）
-F:即flush logs，可以重新生成新的日志文件，當然包括log-bin日志

查看binlog日志

mysql>show master status;

導入之前備份數(shù)據(jù)

mysql -uroot -p t -v -f </mnt/t.sql
-v查看導入的詳細信息
-f是當中間遇到錯誤時，可以skip過去，繼續(xù)執(zhí)行下面的語句

恢復binlog-file二進制日志文件

mysqlbinlog --no-defaults binlog-file | mysql -uroot -p t

從某一(367)點開始恢復

mysqlbinlog --no-defaults --stop-position="367" mysql-bin.000001| mysql -uroot -p t

先查好那一點，用more來查看

[root@localhost mysql]# /usr/bin/mysqlbinlog --no-defaults mysql-bin.000002 --start-position="794" --stop-position="1055" | more

然后恢復

[root@localhost mysql]# /usr/bin/mysqlbinlog --no-defaults mysql-bin.000002 --start-position="794" --stop-position="1055" | /usr/bin/mysql -uroot -p t

重置binlog日志

mysql> reset master;
Query OK, 0 rows affected (0.01 sec)

mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 |      106 |              |                  |
+------------------+----------+--------------+------------------+

mysql> flush logs;#關閉當前的二進制日志文件并創(chuàng)建一個新文件，新的二進制日志文件的名字在當前的二進制文件的編號上加1。

到此這篇關于如何利用MySQL的binlog恢復誤刪數(shù)據(jù)庫的文章就介紹到這了,更多相關MySQL binlog恢復誤刪數(shù)據(jù)庫內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！

相關文章

最新評論