應用案例

誤刪整張表資料，需要緊急回滾

test庫tbl表原有資料
mysql> select * from tbl;
+----+--------+---------------------+
| id | name   | addtime             |
+----+--------+---------------------+
|  1 | 小趙   | 2016-12-10 00:04:33 |
|  2 | 小錢   | 2016-12-10 00:04:48 |
|  3 | 小孫   | 2016-12-13 20:25:00 |
|  4 | 小李   | 2016-12-12 00:00
 
:00 |
+----+--------+---------------------+
4 rows in set (0.00 sec)

mysql> delete from tbl;
Query OK, 4 rows affected (0.00 sec)

20:28時，tbl表誤操作被清空
mysql> select * from tbl;
Empty set (0.00 sec)

恢復資料步驟：

1. 登入mysql，檢視目前的binlog檔案

   mysql> show master status;
   +------------------+-----------+
   | Log_name         | File_size |
   +------------------+-----------+
   | mysql-bin.000051
    
    |       967 |
   | mysql-bin.000052 |       965 |
   +------------------+-----------+

2. 最新的binlog檔案是mysql-bin.000052，我們再定位誤操作SQL的binlog位置。誤操作人只能知道大致的誤操作時間，我們根據大致時間過濾資料。

   shell> python binlog2sql/binlog2sql.py -h127.0.0.1 -P3306 -uadmin -p'admin' -dtest -ttbl --start-file='mysql-bin.000052' --start-datetime='2016-12-13 20:25:00'
    
    --stop-datetime='2016-12-13 20:30:00'
   輸出：
   INSERT INTO `test`.`tbl`(`addtime`, `id`, `name`) VALUES ('2016-12-13 20:26:00', 4, '小李'); #start 317 end 487 time 2016-12-13 20:26:26
   UPDATE `test`.`tbl` SET `addtime`='2016-12-12 00:00:00', `id`=4, `name`='小李' WHERE `addtime`='2016-12-13 20:26:00' AND `id`=4 AND `name`='小李' LIMIT 1; #start 514 end 701 time 2016-12-13 20:27:07
   DELETE FROM `test`.`tbl` WHERE `addtime`='2016-12-10 00:04:33' AND `id`=1 AND `name`='小趙' LIMIT 1; #start 728 end 938 time 2016-12-13 20:28:05
   DELETE FROM `test`.`tbl` WHERE `addtime`='2016-12-10 00:04:48' AND `id`=2 AND `name`='小錢' LIMIT 1; #start 728 end 938 time 2016-12-13 20:28:05
   DELETE FROM `test`.`tbl` WHERE `addtime`='2016-12-13 20:25:00' AND `id`=3 AND `name`='小孫' LIMIT 1; #start 728 end 938 time 2016-12-13 20:28:05
   DELETE FROM `test`.`tbl` WHERE `addtime`='2016-12-12 00:00:00' AND `id`=4 AND `name`='小李' LIMIT 1; #start 728 end 938 time 2016-12-13 20:28:05

3. 我們得到了誤操作sql的準確位置在728-938之間，再根據位置進一步過濾，使用flashback模式生成回滾sql，檢查回滾sql是否正確(注：真實環境下，此步經常會進一步篩選出需要的sql。結合grep、編輯器等)

   shell> python binlog2sql/binlog2sql.py -h127.0.0.1 -P3306 -uadmin -p'admin' -dtest -ttbl --start-file='mysql-bin.000052' --start-position=3346 --stop-position=3556 -B > rollback.sql | cat
   輸出：
   INSERT INTO `test`.`tbl`(`addtime`, `id`, `name`) VALUES ('2016-12-12 00:00:00', 4, '小李'); #start 728 end 938 time 2016-12-13 20:28:05
   INSERT INTO `test`.`tbl`(`addtime`, `id`, `name`) VALUES ('2016-12-13 20:25:00', 3, '小孫'); #start 728 end 938 time 2016-12-13 20:28:05
   INSERT INTO `test`.`tbl`(`addtime`, `id`, `name`) VALUES ('2016-12-10 00:04:48', 2, '小錢'); #start 728 end 938 time 2016-12-13 20:28:05
   INSERT INTO `test`.`tbl`(`addtime`, `id`, `name`) VALUES ('2016-12-10 00:04:33', 1, '小趙'); #start 728 end 938 time 2016-12-13 20:28:05

4. 確認回滾sql正確，執行回滾語句。登入mysql確認，資料回滾成功。

   shell> mysql -h127.0.0.1 -P3306 -uadmin -p'admin' < rollback.sql
   
   mysql> select * from tbl;
   +----+--------+---------------------+
   | id | name   | addtime             |
   +----+--------+---------------------+
   |  1 | 小趙   | 2016-12-10 00:04:33 |
   |  2 | 小錢   | 2016-12-10 00:04:48 |
   |  3 | 小孫   | 2016-12-13 20:25:00 |
   |  4 | 小李   | 2016-12-12 00:00:00 |
   +----+--------+---------------------+