利用MyFlash闪回丢失数据（续）

 

    last night,i've tested flashback by MyFlash tool,but failed,now let's do some other test with it.first of all,clear the test environment:drop the procedure and table created yesterday.

 

 root@localhost:mysql3306.sock [(none)]::>show procedure status where db='zlm';
 +-----+-------------+-----------+----------------+---------------------+---------------------+---------------+---------+----------------------+----------------------+--------------------+
 | Db  | Name        | Type      | Definer        | Modified            | Created             | Security_type | Comment | character_set_client | collation_connection | Database Collation |
 +-----+-------------+-----------+----------------+---------------------+---------------------+---------------+---------+----------------------+----------------------+--------------------+
 | zlm | pro_flashbk | PROCEDURE | root@localhost | -- :: | -- :: | DEFINER       |         | utf8                 | utf8_general_ci      | utf8_general_ci    |
 +-----+-------------+-----------+----------------+---------------------+---------------------+---------------+---------+----------------------+----------------------+--------------------+
  row in set (0.07 sec)

 root@localhost:mysql3306.sock [(none)]::>show tables from zlm;
 +---------------+
 | Tables_in_zlm |
 +---------------+
 | t1            |
 | t2            |
 | t3            |
 | test_flashbk  |
 +---------------+
  rows in set (0.00 sec)

 root@localhost:mysql3306.sock [(none)]::>drop procedure pro_flashbk;
 ERROR  (3D000): No database selected
 root@localhost:mysql3306.sock [(none)]::>use zlm;
 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
 root@localhost:mysql3306.sock [zlm]::>drop procedure pro_flashbk;
 Query OK,  rows affected (0.02 sec)

 root@localhost:mysql3306.sock [zlm]::>drop table test_flashbk;
 Query OK,  rows affected (0.23 sec)

 root@localhost:mysql3306.sock [zlm]::>delimiter //
 root@localhost:mysql3306.sock [zlm]::>create procedure pro_flashbk()
     -> begin
     -> declare id int;
     -> set id = ;
     -> while id> do
     -> insert into test_flashbk(name) values ('aaron8219');
     -> set id=id-;
     -> end while;
     -> end //
 Query OK,  rows affected (0.00 sec)

 root@localhost:mysql3306.sock [zlm]::>delimiter ;
 root@localhost:mysql3306.sock [zlm]::>create table test_flashbk(
     -> id bigint not null auto_increment,
     -> name varchar() not null default '',
     -> primary key(id)
     -> ) engine=innodb default charset=utf8mb4;
 Query OK,  rows affected (0.08 sec)

 root@localhost:mysql3306.sock [zlm]::>call pro_flashbk();
 Query OK,  row affected (14.77 sec)

 root@localhost:mysql3306.sock [zlm]::>select count(*) from test_flashbk;
 +----------+
 | count(*) |
 +----------+
 |    |
 +----------+
  row in set (0.04 sec)

 root@localhost:mysql3306.sock [zlm]::>checksum table test_flashbk;
 +------------------+------------+
 | Table            | Checksum   |
 +------------------+------------+
 | zlm.test_flashbk |  |
 +------------------+------------+
  row in set (0.06 sec)

 root@localhost:mysql3306.sock [zlm]::>show binary logs;
 +------------------+-----------+
 | Log_name         | File_size |
 +------------------+-----------+
 | mysql-bin. |        |
 | mysql-bin. |       |
 | mysql-bin. |        |
 | mysql-bin. |        |
 | mysql-bin. |  |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |    |
 | mysql-bin. |  |
 | mysql-bin. |    |
 | mysql-bin. |   |

 | mysql-bin. |   |
 +------------------+-----------+
  rows in set (0.00 sec)

 

    in order to make sure what binary log i need to generate the flashback file,i use "flush binary logs" and "show binary logs" to mark the explicit binary log(here is the mysql-bin.000027).after that,i do the deletion operation by intentionally forget to use where clause,obviously all the records in the test table "test_flashbk" will be deleted in the end as below:

 

 root@localhost:mysql3306.sock [zlm]::>flush binary logs;
 Query OK,  rows affected (0.11 sec)

 root@localhost:mysql3306.sock [zlm]::>show binary logs;
 +------------------+-----------+
 | Log_name         | File_size |
 +------------------+-----------+
 | mysql-bin. |        |
 | mysql-bin. |       |
 | mysql-bin. |        |
 | mysql-bin. |        |
 | mysql-bin. |  |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |    |
 | mysql-bin. |  |
 | mysql-bin. |    |
 | mysql-bin. |   |
 | mysql-bin. |   |
 | mysql-bin. |        |
 +------------------+-----------+
  rows in set (0.00 sec)

 root@localhost:mysql3306.sock [zlm]::>delete from test_flashbk;
 Query OK,  rows affected (1.19 sec)

 root@localhost:mysql3306.sock [zlm]::>select count(*) from test_flashbk;
 +----------+
 | count(*) |
 +----------+
 |         |
 +----------+
  row in set (0.00 sec)

 root@localhost:mysql3306.sock [zlm]::>checksum table test_flashbk;
 +------------------+----------+
 | Table            | Checksum |
 +------------------+----------+
 | zlm.test_flashbk |         |
 +------------------+----------+
  row in set (0.00 sec)

 root@localhost:mysql3306.sock [zlm]::>flush logs;
 Query OK,  rows affected (0.12 sec)

 root@localhost:mysql3306.sock [zlm]::>show binary logs;
 +------------------+-----------+
 | Log_name         | File_size |
 +------------------+-----------+
 | mysql-bin. |        |
 | mysql-bin. |       |
 | mysql-bin. |        |
 | mysql-bin. |        |
 | mysql-bin. |  |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |    |
 | mysql-bin. |  |
 | mysql-bin. |    |
 | mysql-bin. |   |
 | mysql-bin. |   |
 | mysql-bin. |    |
 | mysql-bin. |        |
 +------------------+-----------+
  rows in set (0.00 sec)

 root@localhost:mysql3306.sock [zlm]::>

 

    then,i will use MyFlash tool to generate the flashback file which will contain the miss deleted records of the test table by the operatoin just now.

 

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #ls -l
 total
 -rwxrwxrwx  vagrant vagrant    Oct    flashback
 -rwxrwxrwx  vagrant vagrant  Oct    mysqlbinlog20160408

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #./flashback --databaseNames zlm --tableNames test_flashbk --sqlTypes='DELETE' --binlogFileNames=/data/mysql/mysql3306/logs/mysql-bin.

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #ls -l
 total
 -rwxrwxrwx  vagrant vagrant  Jun   : binlog_output_base.flashback
 -rwxrwxrwx  vagrant vagrant    Oct    flashback
 -rwxrwxrwx  vagrant vagrant  Oct    mysqlbinlog20160408

 [root@zlm1 :: /vagrant/MyFlash-master/binary]

 #mysqlbinlog --skip-gtids binlog_output_base.flashback | mysql

    now,let's check the records of the test table "test_flashbk" in another session with mysql client,finally you'll find the data turns back again:

 

 root@localhost:mysql3306.sock [zlm]::>select count(*) from test_flashbk;
 ERROR  (HY000): MySQL server has gone away
 No connection. Trying to reconnect...
 Connection id:
 Current database: zlm

 +----------+
 | count(*) |

 +----------+
 |    |
 +----------+
  row in set (0.04 sec)

 root@localhost:mysql3306.sock [zlm]::>checksum table test_flashbk;
 +------------------+------------+
 | Table            | Checksum   |
 +------------------+------------+
 | zlm.test_flashbk |  |
 +------------------+------------+
  row in set (0.06 sec)

 root@localhost:mysql3306.sock [zlm]::>

     moreover,i test the flashback of insertion operation as below:

 root@localhost:mysql3306.sock [zlm]::>delete from test_flashbk;
 Query OK,  rows affected (1.08 sec)

 root@localhost:mysql3306.sock [zlm]::>checksum table test_flashbk;
 +------------------+----------+
 | Table            | Checksum |
 +------------------+----------+
 | zlm.test_flashbk |         |
 +------------------+----------+
  row in set (0.01 sec)

 root@localhost:mysql3306.sock [zlm]::>flush logs;
 Query OK,  rows affected (0.06 sec)

 root@localhost:mysql3306.sock [zlm]::>show binary logs;
 +------------------+-----------+
 | Log_name         | File_size |
 +------------------+-----------+
 | mysql-bin. |        |
 | mysql-bin. |       |
 | mysql-bin. |        |
 | mysql-bin. |        |
 | mysql-bin. |  |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |    |
 | mysql-bin. |  |
 | mysql-bin. |    |
 | mysql-bin. |   |
 | mysql-bin. |   |
 | mysql-bin. |    |
 | mysql-bin. |    |
 | mysql-bin. |    |
 | mysql-bin. |        |
 +------------------+-----------+
  rows in set (0.00 sec)

 root@localhost:mysql3306.sock [zlm]::>call pro_flashbk();
 Query OK,  row affected (14.59 sec)

 root@localhost:mysql3306.sock [zlm]::>select count(*) from test_flashbk;
 +----------+
 | count(*) |
 +----------+
 |    |
 +----------+
  row in set (0.03 sec)

 root@localhost:mysql3306.sock [zlm]::>checksum table test_flashbk;
 +------------------+------------+
 | Table            | Checksum   |
 +------------------+------------+
 | zlm.test_flashbk |  |
 +------------------+------------+
  row in set (0.05 sec)

 root@localhost:mysql3306.sock [zlm]::>show binary logs;
 +------------------+-----------+
 | Log_name         | File_size |
 +------------------+-----------+
 | mysql-bin. |        |
 | mysql-bin. |       |
 | mysql-bin. |        |
 | mysql-bin. |        |
 | mysql-bin. |  |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |    |
 | mysql-bin. |  |
 | mysql-bin. |    |
 | mysql-bin. |   |
 | mysql-bin. |   |
 | mysql-bin. |    |
 | mysql-bin. |    |
 | mysql-bin. |    |
 | mysql-bin. |   |
 +------------------+-----------+
  rows in set (0.00 sec)

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #ls -l
 total
 -rwxrwxrwx  vagrant vagrant  Jun   : binlog_output_base.flashback
 -rwxrwxrwx  vagrant vagrant    Oct    flashback
 -rwxrwxrwx  vagrant vagrant  Oct    mysqlbinlog20160408

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #rm -f binlog_output_base.flashback 

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #./flashback --databaseNames zlm --tableNames test_flashbk --sqlTypes='INSERT' --binlogFileNames=/data/mysql/mysql3306/logs/mysql-bin.

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #ls -l
 total
 -rwxrwxrwx  vagrant vagrant  Jun   : binlog_output_base.flashback
 -rwxrwxrwx  vagrant vagrant     Oct    flashback
 -rwxrwxrwx  vagrant vagrant   Oct    mysqlbinlog20160408

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #mysqlbinlog --skip-gtids binlog_output_base.flashback | mysql

 root@localhost:mysql3306.sock [zlm]::>select count(*) from test_flashbk;
 ERROR  (HY000): MySQL server has gone away
 No connection. Trying to reconnect...
 Connection id:
 Current database: zlm

 +----------+
 | count(*) |
 +----------+
 |         |
 +----------+
  row in set (0.00 sec)

 root@localhost:mysql3306.sock [zlm]::>show binary logs;
 +------------------+-----------+
 | Log_name         | File_size |
 +------------------+-----------+
 | mysql-bin. |        |
 | mysql-bin. |       |
 | mysql-bin. |        |
 | mysql-bin. |        |
 | mysql-bin. |  |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |    |
 | mysql-bin. |  |
 | mysql-bin. |    |
 | mysql-bin. |   |
 | mysql-bin. |   |
 | mysql-bin. |    |
 | mysql-bin. |    |
 | mysql-bin. |    |
 | mysql-bin. |   |
 +------------------+-----------+
  rows in set (0.00 sec)

 root@localhost:mysql3306.sock [zlm]::>checksum table test_flashbk;
 ERROR  (HY000): MySQL server has gone away
 No connection. Trying to reconnect...
 Connection id:
 Current database: zlm

 +------------------+----------+
 | Table            | Checksum |
 +------------------+----------+
 | zlm.test_flashbk |         |
 +------------------+----------+
  row in set (0.00 sec)

 root@localhost:mysql3306.sock [zlm]::>

    in the end, i test the flashback of update operation,i still get some faults:

 root@localhost:mysql3306.sock [zlm]::>call pro_flashbk();
 ERROR  (HY000): MySQL server has gone away
 No connection. Trying to reconnect...
 Connection id:
 Current database: zlm

 Query OK,  row affected (14.02 sec)

 root@localhost:mysql3306.sock [zlm]::>select count(*) from test_flashbk;
 +----------+
 | count(*) |
 +----------+
 |    |
 +----------+
  row in set (0.04 sec)

 root@localhost:mysql3306.sock [zlm]::>checksum table test_flashbk;
 +------------------+------------+
 | Table            | Checksum   |
 +------------------+------------+
 | zlm.test_flashbk |  |
 +------------------+------------+
  row in set (0.06 sec)

 root@localhost:mysql3306.sock [zlm]::>flush logs;
 Query OK,  rows affected (0.07 sec)

 root@localhost:mysql3306.sock [zlm]::>show binary logs;
 +------------------+-----------+
 | Log_name         | File_size |
 +------------------+-----------+
 | mysql-bin. |        |
 | mysql-bin. |       |
 | mysql-bin. |        |
 | mysql-bin. |        |
 | mysql-bin. |  |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |    |
 | mysql-bin. |  |
 | mysql-bin. |    |
 | mysql-bin. |   |
 | mysql-bin. |   |
 | mysql-bin. |    |
 | mysql-bin. |    |
 | mysql-bin. |    |
 | mysql-bin. |   |
 | mysql-bin. |        |
 +------------------+-----------+
  rows in set (0.00 sec)

 root@localhost:mysql3306.sock [zlm]::>update test_flashbk set name='zlm';
 Query OK,  rows affected (2.65 sec)
 Rows matched:   Changed:   Warnings: 

 root@localhost:mysql3306.sock [zlm]::>show binary logs;
 +------------------+-----------+
 | Log_name         | File_size |
 +------------------+-----------+
 | mysql-bin. |        |
 | mysql-bin. |       |
 | mysql-bin. |        |
 | mysql-bin. |        |
 | mysql-bin. |  |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |    |
 | mysql-bin. |  |
 | mysql-bin. |    |
 | mysql-bin. |   |
 | mysql-bin. |   |
 | mysql-bin. |    |
 | mysql-bin. |    |
 | mysql-bin. |    |
 | mysql-bin. |   |
 | mysql-bin. |    |
 +------------------+-----------+
  rows in set (0.00 sec)

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #rm -f binlog_output_base.flashback 

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #./flashback --databaseNames zlm --tableNames test_flashbk --sqlTypes='UPDATE' --binlogFileNames=/data/mysql/mysql3306/logs/mysql-bin.

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #ls -l
 total
 -rwxrwxrwx  vagrant vagrant  Jun   : binlog_output_base.flashback
 -rwxrwxrwx  vagrant vagrant    Oct    flashback
 -rwxrwxrwx  vagrant vagrant  Oct    mysqlbinlog20160408

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #mysqlbinlog --skip-gtids binlog_output_base.flashback | mysql
 ERROR  (HY000) at line : MySQL server has gone away

 [root@zlm1 :: /vagrant/MyFlash-master/binary]
 #

 root@localhost:mysql3306.sock [zlm]::>checksum table test_flashbk;
 ERROR  (HY000): MySQL server has gone away
 No connection. Trying to reconnect...
 Connection id:
 Current database: zlm

 +------------------+------------+
 | Table            | Checksum   |
 +------------------+------------+
 | zlm.test_flashbk |  |
 +------------------+------------+
  row in set (0.07 sec)

 root@localhost:mysql3306.sock [zlm]::>show binary logs;
 +------------------+-----------+
 | Log_name         | File_size |
 +------------------+-----------+
 | mysql-bin. |        |
 | mysql-bin. |       |
 | mysql-bin. |        |
 | mysql-bin. |        |
 | mysql-bin. |  |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |   |
 | mysql-bin. |        |
 | mysql-bin. |    |
 | mysql-bin. |  |
 | mysql-bin. |    |
 | mysql-bin. |   |
 | mysql-bin. |   |
 | mysql-bin. |    |
 | mysql-bin. |    |
 | mysql-bin. |    |
 | mysql-bin. |   |
 | mysql-bin. |    |
 +------------------+-----------+
  rows in set (0.00 sec)

 root@localhost:mysql3306.sock [zlm]::>select count(*) from test_flashbk where name='aaron8219';
 +----------+
 | count(*) |
 +----------+
 |         |
 +----------+
  row in set (0.04 sec)

 root@localhost:mysql3306.sock [zlm]::>

    i guess,there're some compatibility issues with the tool,'cause i got the inscrutable phenomenon when using it doing flashback of update operation last night.

 

Summary:

• MyFlash is fast and convenient to flashback some insertion and deletion operations.
• it still has some unpredictable issue when doing flashback of update.
• as far as i know,it is faster then another tool named "binlog2sql" which one is released by Mertuan-Dianping too.