mysqlbinlog 工具的使用 , 大家可以看 MySQL 的帮助手册。里面有详细的用,在这个例子中,重点是 --start-position 参数和 --stop-position
· --start-position=N
从二进制日志中第 1 个位置等于 N
· --stop-position=N
从二进制日志中第 1 个位置等于和大于 N
OK ,现在开始,要启动二进制日志记录,要先在 my.cnf / my.ini 文件的 mysqld
log-bin=
在这里,偶是的设置是 log-bin=liangck
然后再启动 mysql 服务,因为偶是用 windows 系统,所以执行 net start mysql
然后在一测试数据库里,创建一个表,并添加记录。
mysql> create table test( id int auto_increment not null primary key , val int , data varchar ( 20));
mysql> insert into test( val, data) values ( 10, 'liang' );
Query OK, 1 row affected ( 0.03 sec)
mysql> insert into test( val, data) values ( 20, 'jia' );
Query OK, 1 row affected ( 0.08 sec)
mysql> insert into test( val, data) values ( 30, 'hui' );
Query OK, 1 row affected ( 0.03 sec)
mysql> flush logs; --
Query OK, 0 rows affected ( 0.09 sec)
mysql> insert into test( val, data) values ( 40, 'aaa' );
Query OK, 1 row affected ( 0.05 sec)
mysql> insert into test( val, data) values ( 50, 'bbb' );
Query OK, 1 row affected ( 0.03 sec)
mysql> insert into test( val, data) values ( 60, 'ccc' );
Query OK, 1 row affected ( 0.03 sec)
mysql> delete from test where id between 4 and 5; --
Query OK, 2 rows affected ( 0.05 sec)
mysql> insert into test( val, data) values ( 70, 'ddd' );
Query OK, 1 row affected ( 0.03 sec)
mysql> flush logs; --
Query OK, 0 rows affected ( 0.11 sec)
mysql> insert into test( val, data) values ( 80, 'dddd' );
Query OK, 1 row affected ( 0.05 sec)
mysql> insert into test( val, data) values ( 90, 'eeee' );
Query OK, 1 row affected ( 0.03 sec)
mysql> drop table test; --
Query OK, 0 row affected ( 0.05 sec)
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OK
就是将 test
先用 mysqlbinlog 工具将日志文件生成 txt
F:\Program Files\MySQL_Data\data\log>mysqlbinlog liangck.000001 > G:\001.txt
F:\Program Files\MySQL_Data\data\log>mysqlbinlog liangck.000002 > G:\002.txt
F:\Program Files\MySQL_Data\data\log>mysqlbinlog liangck.000003 > G:\003.txt
通过这三个命令,可以在 G 盘下生成 3
因为我们需要重做第一个日志文件的所有操作,所以这里只需要将第一个日志文件全恢复就行了。
F:\Program Files\MySQL_Data\data\log>mysqlbinlog liangck.000001 | mysql -uroot –p
Ok, 接着,我们需要分析的是第二个日志文件。为什么要分析它呢,因为它中途执行了一个操作是 DELETE
我们先打开 002.txt
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#090427 15:27:56 server id 1 end_log_pos 106 Start: binlog v 4, server v 5.1.32-community-log created 090427 15:27:56
BINLOG '
fF71SQ8BAAAAZgAAAGoAAAAAAAQANS4xLjMyLWNvbW11bml0eS1sb2cAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAEzgNAAgAEgAEBAQEEgAAUwAEGggAAAAICAgC
'/*!*/;
# at 106
#090427 15:28:37 server id 1 end_log_pos 176 Query thread_id=1 exec_time=0 error_code=0
use mytest/*!*/;
SET TIMESTAMP=1240817317/*!*/;
SET @@session.pseudo_thread_id=1/*!*/;
SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=1, @@session.unique_checks=1, @@session.autocommit=1/*!*/;
SET @@session.sql_mode=1344274432/*!*/;
SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
/*!\C gbk *//*!*/;
SET @@session.character_set_client=28,@@session.collation_connection=28,@@session.collation_server=28/*!*/;
SET @@session.lc_time_names=0/*!*/;
SET @@session.collation_database=DEFAULT/*!*/;
BEGIN
/*!*/;
# at 176
#090427 15:28:37 server id 1 end_log_pos 204 Intvar
SET INSERT_ID=4/*!*/;
# at 204
#090427 15:28:37 server id 1 end_log_pos 312 Query thread_id=1 exec_time=0 error_code=0
SET TIMESTAMP=1240817317/*!*/;
insert into test(val,data) values(40,'aaa')
/*!*/;
# at 312
#090427 15:28:37 server id 1 end_log_pos 339 Xid = 12
COMMIT/*!*/;
# at 339
#090427 15:28:46 server id 1 end_log_pos 409 Query thread_id=1 exec_time=0 error_code=0
SET TIMESTAMP=1240817326/*!*/;
BEGIN
/*!*/;
# at 409
#090427 15:28:46 server id 1 end_log_pos 437 Intvar
SET INSERT_ID=5/*!*/;
# at 437
#090427 15:28:46 server id 1 end_log_pos 545 Query thread_id=1 exec_time=0 error_code=0
SET TIMESTAMP=1240817326/*!*/;
insert into test(val,data) values(50,'bbb')
/*!*/;
# at 545
#090427 15:28:46 server id 1 end_log_pos 572 Xid = 13
COMMIT/*!*/;
# at 572
#090427 15:29:35 server id 1 end_log_pos 642 Query thread_id=1 exec_time=0 error_code=0
SET TIMESTAMP=1240817375/*!*/;
BEGIN
/*!*/;
# at 642
#090427 15:29:35 server id 1 end_log_pos 670 Intvar
SET INSERT_ID=6/*!*/;
# at 670
#090427 15:29:35 server id 1 end_log_pos 778 Query thread_id=1 exec_time=0 error_code=0
SET TIMESTAMP=1240817375/*!*/;
insert into test(val,data) values(60,'ccc')
/*!*/;
# at 778
#090427 15:29:35 server id 1 end_log_pos 805 Xid = 14
COMMIT/*!*/;
# at 805
#090427 15:30:21 server id 1 end_log_pos 875 Query thread_id=1 exec_time=0 error_code=0
SET TIMESTAMP=1240817421/*!*/;
BEGIN
/*!*/;
# at 875
#090427 15:30:21 server id 1 end_log_pos 981 Query thread_id=1 exec_time=0 error_code=0
SET TIMESTAMP=1240817421/*!*/;
delete from test where id between 4 and 5
/*!*/;
# at 981
#090427 15:30:21 server id 1 end_log_pos 1008 Xid = 15
COMMIT/*!*/;
# at 1008
#090427 15:30:34 server id 1 end_log_pos 1078 Query thread_id=1 exec_time=0 error_code=0
SET TIMESTAMP=1240817434/*!*/;
BEGIN
/*!*/;
# at 1078
#090427 15:30:34 server id 1 end_log_pos 1106 Intvar
SET INSERT_ID=7/*!*/;
# at 1106
#090427 15:30:34 server id 1 end_log_pos 1214 Query thread_id=1 exec_time=0 error_code=0
SET TIMESTAMP=1240817434/*!*/;
insert into test(val,data) values(70,'ddd')
/*!*/;
# at 1214
#090427 15:30:34 server id 1 end_log_pos 1241 Xid = 16
COMMIT/*!*/;
# at 1241
#090427 15:30:41 server id 1 end_log_pos 1282 Rotate to liangck.000003 pos: 4
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
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在这个文件中,我们可以看到 DELETE 的操作的起始位置是 875 ,终止位置是 1008. 那么我们只要重做第二个日志文件的开头到 875 的操作,然后再从 1008 到末尾的操作,我们就可以把数据给恢复回来,而不会 DELETE
F:\Program Files\MySQL_Data\data\log>mysqlbinlog liangck.000002 --stop-pos=875 | mysql -uroot -p
F:\Program Files\MySQL_Data\data\log>mysqlbinlog liangck.000002 --start-pos=1008 | mysql -uroot -p mytest
OK,
第三个日志文件也是同理,只要找到 DROP TABLE
F:\Program Files\MySQL_Data\data\log>mysqlbinlog liangck.000003 --stop-pos=574 | mysql -uroot –p
现在我们再查一下数据看看 :
mysql> select * from test;
+----+------+-------+
| id | val | data |
+----+------+-------+
| 1 | 10 | liang |
| 2 | 20 | jia |
| 3 | 30 | hui |
| 4 | 40 | aaa |
| 5 | 50 | bbb |
| 6 | 60 | ccc |
| 7 | 70 | ddd |
| 8 | 80 | dddd |
| 9 | 90 | eeee |
+----+------+-------+
9 rows in set (0.00 sec)
可以看到,全部数据都回来了。