MySQL Study学习之-MySQL二进制日志管理

2022/8/27 2:23:10

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MySQL二进制日志(Binary Log)


a、它包含的内容及作用如下:
包含了所有更新了数据或者已经潜在更新了数据(比如没有匹配任何行的一个DELETE)
包含关于每个更新数据库(DML)的语句的执行时间信息
不包含没有修改任何数据的语句,如果需要启用该选项,需要开启通用日志功能
主要目的是尽可能的将数据库恢复到数据库故障点,因为二进制日志包含备份后进行的所有更新
用于在主复制服务器上记录所有将发送给从服务器的语句
启用该选项数据库性能降低1%,但保障数据库完整性,对于重要数据库值得以性能换完整。有些类似于Oracle开启归档模式。

b、开启二进制日志的方法及属性
使用--log-bin[=file_name]选项或在配置文件中指定log-bin启动时,mysqld写入包含所有更新数据的SQL命令的日志文件。
对于未给出file_name值,默认名为-bin后面所跟的主机名。
在未指定绝对路径的情形下,缺省位置保存在数据目录下。
每个二进制日志名会添加一个数字扩展名用于日志老化,因此不支持自定义的扩展名,会被mysql数字扩展名动态替换。
若当前的日志大小达到max_binlog_size,则自动创建新的二进制日志。
对于大的事务,二进制日志会超过max_binlog_size设定的值。也即是事务仅仅写入一个二进制日志。
由是可知,二进制日志文件大小接近,其size不是完全相等,这点不同于oracle。
二进制日志文件会有一个对应二进制日志索引文件,该文件包含所有的二进制日志,其文件名与二进制日志相同,扩展名为.index
二进制索引文件通过--log-bin-index[=file_name]选项来指定
RESETMASTER语句将删除所有二进制日志文件,这将影响到从库。也可以用PURGE MASTER LOGS只删除部分二进制文件。

二进制日志记录了所有对数据库执行更改的操作,二进制主要有以下两种作用:

1、恢复(recovery)2、复制(replication)

二进制日志的启动:配置参数log-bin[=name],如果不指定name,则默认二进制日志文件名为主机名,后缀名为二级制日志的序列号,所在路径为数据库所在目录。

以index为后缀的文件为二进制日志的索引文件,用来存储过程生产的二进制日志。

和二进制日志相关的参数:

max_binlog_size、binlog_cache_size、sync_binlog、binlog-do-db、binlog-ignore-db、log-slave-update、binlog_format

1、max_binlog_size,该参数指定了单个二进制日志文件的最大值,如果超过该值,则产生新的二进制日志文件,后缀名+1,并记录到.index文件,从Mysql5.0开始的默认值为1073741824,代表1G。

Mysql5.5的默认值

mysql> show variables like '%max_binlog%';
+----------------------------+----------------------+
| Variable_name | Value |
+----------------------------+----------------------+
| max_binlog_cache_size | 18446744073709547520 |
| max_binlog_size | 1073741824 |
| max_binlog_stmt_cache_size | 18446744073709547520 |
+----------------------------+----------------------+
3 rows in set (0.00 sec)
当使用事务的存储引擎InnoDB时,所有未提交的事务会记录到一个缓存中,等待事务提交时,直接将缓冲中的二进制日志写入二进制日志文件,而该缓冲的大小由binlog_cache_size决定,默认大小为32KB,此外,binlog_cache_size是基于session的,也就是,当一个线程开始一个事务时,mysql会自动分配一个大小为binlog_cache_size的缓存,因此该值得设置需要相当小心,可以通过show global status 查看binlog_cache_use、binlog_cache_disk_use的状态,可以判断当前binlog_cache_size的设置是否合适。

2、Binlog_cache_size的默认大小为32KB

mysql> show variables like 'binlog_cache%';
+-------------------+-------+
| Variable_name | Value |
+-------------------+-------+
| binlog_cache_size | 32768 |
+-------------------+-------+
1 row in set (0.00 sec)

3、参数sync_binlog=[N]表示每写缓存多少次就同步到磁盘,如果将N设置为1,则表示采用同步写磁盘的方式来写二进制日志,该参数很重要,这个以后还会提到。值得注意的是,在将该参数设置为1时,也应该将innodb_support_xa设为1来解决,这可以确保二进制日志和InnoDB存储引擎数据文件的同步。

4、参数binlog-do-db和binlog-ignore-db表示需要写入或者忽略写入哪些库的日志,默认值为空,则表示将所有库的日志同步到二进制日志。

5、Log-slave-update该参数在搭建master=>slave=>slave的架构时,需要配置。

6、Binlog_format参数也特别重要。从mysql5.1版本开始引入这个参数,该参数可以设置的值有STATEMENT\、ROW、MIXED;

(1)STATEMENT格式和之前的mysql版本一样,二进制日志文件记录的是日志的逻辑SQL语句。

(2)在ROW格式下,二进制日志记录的不再是简单的SQL语句了,而是记录表的行更改情况,此时可以将InnoDB的事务隔离基本设为READ COMMITTED,以获得更好的并发性。

(3)MIXED格式下,mysql默认采用的STATEMENT格式进行二进制日志文件的记录,但是在一些情况下会使用ROW格式,可能的情况包括:

1)表的存储引擎为NDB,这时对于表的DML操作都会以ROW格式记录

2)使用了UUID()、USER()、CURRENT_USER()、FOUND_ROWS()、ROW_COUNT()等不确定函数

3)使用了INSERT DELAY语句

4)使用了用户定义函数

5)使用了临时表

 

案例分析:

1、 二进制日志存放位置


[root@mysrv ~]# more /etc/my.cnf
[mysqld]
datadir=/usr/local/mysql/data/mysql

mysql> show variables like '%datadir%';
+---------------+------------------------------+
| Variable_name | Value |
+---------------+------------------------------+
| datadir | /usr/local/mysql/data/mysql/ |
+---------------+------------------------------+
1 row in set (0.00 sec)


查看日志信息:
[root@mysrv ~]# cd /usr/local/mysql/data/mysql/
[root@mysrv mysql]# ls -l
total 29928
-rw-rw---- 1 mysql mysql 56 Jun 30 17:12 auto.cnf
-rw-rw---- 1 mysql mysql 18874368 Jul 8 15:17 ibdata1
-rw-rw---- 1 mysql mysql 5242880 Jul 8 15:17 ib_logfile0
-rw-rw---- 1 mysql mysql 5242880 Jun 30 17:12 ib_logfile1
-rw-rw---- 1 mysql mysql 124 Jul 8 15:17 master.info
drwx--S--- 2 mysql mysql 4096 Jun 30 17:15 mysql
-rw-rw---- 1 mysql mysql 114 Jun 30 17:15 mysql-bin.000001
-rw-rw---- 1 mysql mysql 63438 Jun 30 17:15 mysql-bin.000002
-rw-rw---- 1 mysql mysql 1096670 Jun 30 17:15 mysql-bin.000003
-rw-rw---- 1 mysql mysql 252 Jun 30 17:26 mysql-bin.000004
-rw-rw---- 1 mysql mysql 114 Jun 30 17:40 mysql-bin.000005
-rw-rw---- 1 mysql mysql 133 Jun 30 17:51 mysql-bin.000006
-rw-rw---- 1 mysql mysql 114 Jun 30 17:56 mysql-bin.000007
-rw-rw---- 1 mysql mysql 114 Jul 8 15:17 mysql-bin.000008
-rw-rw---- 1 mysql mysql 157 Jul 8 15:18 mysql-bin.000009
-rw-rw---- 1 mysql mysql 157 Jul 8 15:20 mysql-bin.000010
-rw-rw---- 1 mysql mysql 114 Jul 8 15:20 mysql-bin.000011
-rw-rw---- 1 mysql mysql 209 Jul 8 15:20 mysql-bin.index
-rw-rw---- 1 mysql mysql 24920 Jul 8 15:21 mysrv.err
-rw-rw---- 1 mysql mysql 5 Jul 8 15:17 mysrv.pid
-rw-rw---- 1 mysql mysql 163 Jul 8 15:18 mysrv-relay-bin.000003
-rw-rw---- 1 mysql mysql 163 Jul 8 15:20 mysrv-relay-bin.000004
-rw-rw---- 1 mysql mysql 114 Jul 8 15:20 mysrv-relay-bin.000005
-rw-rw---- 1 mysql mysql 75 Jul 8 15:20 mysrv-relay-bin.index
drwx--S--- 2 mysql mysql 4096 Jun 30 17:15 performance_schema
drwx--S--- 2 mysql mysql 4096 Jun 30 18:15 prod
-rw-rw---- 1 mysql mysql 58 Jul 8 15:20 relay-log.info
drwx--S--- 2 mysql mysql 4096 Jun 30 17:15 test
<strong>mysrv-relay-bin.index,为记录日志文件的index文件</strong>
[root@mysrv mysql]# cat mysql-bin.index
./mysql-bin.000001
./mysql-bin.000002
./mysql-bin.000003
./mysql-bin.000004
./mysql-bin.000005
./mysql-bin.000006
./mysql-bin.000007
./mysql-bin.000008
./mysql-bin.000009
./mysql-bin.000010
./mysql-bin.000011
./mysql-bin.000012
./mysql-bin.000013
./mysql-bin.000014

2、二进制日志文件的切换

执行flush logs产生新的二进制日志:
mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000011 | 114 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

mysql> flush logs;
Query OK, 0 rows affected (0.08 sec)

[root@mysrv mysql]# ls -l
total 29936
-rw-rw---- 1 mysql mysql 56 Jun 30 17:12 auto.cnf
-rw-rw---- 1 mysql mysql 18874368 Jul 8 15:17 ibdata1
-rw-rw---- 1 mysql mysql 5242880 Jul 8 15:17 ib_logfile0
-rw-rw---- 1 mysql mysql 5242880 Jun 30 17:12 ib_logfile1
-rw-rw---- 1 mysql mysql 124 Jul 8 15:17 master.info
drwx--S--- 2 mysql mysql 4096 Jun 30 17:15 mysql
-rw-rw---- 1 mysql mysql 114 Jun 30 17:15 mysql-bin.000001
-rw-rw---- 1 mysql mysql 63438 Jun 30 17:15 mysql-bin.000002
-rw-rw---- 1 mysql mysql 1096670 Jun 30 17:15 mysql-bin.000003
-rw-rw---- 1 mysql mysql 252 Jun 30 17:26 mysql-bin.000004
-rw-rw---- 1 mysql mysql 114 Jun 30 17:40 mysql-bin.000005
-rw-rw---- 1 mysql mysql 133 Jun 30 17:51 mysql-bin.000006
-rw-rw---- 1 mysql mysql 114 Jun 30 17:56 mysql-bin.000007
-rw-rw---- 1 mysql mysql 114 Jul 8 15:17 mysql-bin.000008
-rw-rw---- 1 mysql mysql 157 Jul 8 15:18 mysql-bin.000009
-rw-rw---- 1 mysql mysql 157 Jul 8 15:20 mysql-bin.000010
-rw-rw---- 1 mysql mysql 157 Jul 8 15:24 mysql-bin.000011
-rw-rw---- 1 mysql mysql 114 Jul 8 15:24 mysql-bin.000012
-rw-rw---- 1 mysql mysql 228 Jul 8 15:24 mysql-bin.index
-rw-rw---- 1 mysql mysql 25322 Jul 8 15:24 mysrv.err
-rw-rw---- 1 mysql mysql 5 Jul 8 15:17 mysrv.pid
-rw-rw---- 1 mysql mysql 163 Jul 8 15:18 mysrv-relay-bin.000003
-rw-rw---- 1 mysql mysql 163 Jul 8 15:20 mysrv-relay-bin.000004
-rw-rw---- 1 mysql mysql 163 Jul 8 15:24 mysrv-relay-bin.000005
-rw-rw---- 1 mysql mysql 114 Jul 8 15:24 mysrv-relay-bin.000006
-rw-rw---- 1 mysql mysql 100 Jul 8 15:24 mysrv-relay-bin.index
drwx--S--- 2 mysql mysql 4096 Jun 30 17:15 performance_schema
drwx--S--- 2 mysql mysql 4096 Jun 30 18:15 prod
-rw-rw---- 1 mysql mysql 58 Jul 8 15:24 relay-log.info
drwx--S--- 2 mysql mysql 4096 Jun 30 17:15 test


采用mysqladmin切换:

[root@mysrv ~]# mysqladmin flush-logs -u root -p
Enter password:

[root@mysrv mysql]# ls -l
total 29944
-rw-rw---- 1 mysql mysql 56 Jun 30 17:12 auto.cnf
-rw-rw---- 1 mysql mysql 18874368 Jul 8 15:17 ibdata1
-rw-rw---- 1 mysql mysql 5242880 Jul 8 15:17 ib_logfile0
-rw-rw---- 1 mysql mysql 5242880 Jun 30 17:12 ib_logfile1
-rw-rw---- 1 mysql mysql 124 Jul 8 15:17 master.info
drwx--S--- 2 mysql mysql 4096 Jun 30 17:15 mysql
-rw-rw---- 1 mysql mysql 114 Jun 30 17:15 mysql-bin.000001
-rw-rw---- 1 mysql mysql 63438 Jun 30 17:15 mysql-bin.000002
-rw-rw---- 1 mysql mysql 1096670 Jun 30 17:15 mysql-bin.000003
-rw-rw---- 1 mysql mysql 252 Jun 30 17:26 mysql-bin.000004
-rw-rw---- 1 mysql mysql 114 Jun 30 17:40 mysql-bin.000005
-rw-rw---- 1 mysql mysql 133 Jun 30 17:51 mysql-bin.000006
-rw-rw---- 1 mysql mysql 114 Jun 30 17:56 mysql-bin.000007
-rw-rw---- 1 mysql mysql 114 Jul 8 15:17 mysql-bin.000008
-rw-rw---- 1 mysql mysql 157 Jul 8 15:18 mysql-bin.000009
-rw-rw---- 1 mysql mysql 157 Jul 8 15:20 mysql-bin.000010
-rw-rw---- 1 mysql mysql 157 Jul 8 15:24 mysql-bin.000011
-rw-rw---- 1 mysql mysql 157 Jul 8 15:34 mysql-bin.000012
-rw-rw---- 1 mysql mysql 114 Jul 8 15:34 mysql-bin.000013
-rw-rw---- 1 mysql mysql 247 Jul 8 15:34 mysql-bin.index
-rw-rw---- 1 mysql mysql 26536 Jul 8 15:34 mysrv.err
-rw-rw---- 1 mysql mysql 5 Jul 8 15:17 mysrv.pid
-rw-rw---- 1 mysql mysql 163 Jul 8 15:18 mysrv-relay-bin.000003
-rw-rw---- 1 mysql mysql 163 Jul 8 15:20 mysrv-relay-bin.000004
-rw-rw---- 1 mysql mysql 163 Jul 8 15:24 mysrv-relay-bin.000005
-rw-rw---- 1 mysql mysql 163 Jul 8 15:34 mysrv-relay-bin.000006
-rw-rw---- 1 mysql mysql 114 Jul 8 15:34 mysrv-relay-bin.000007
-rw-rw---- 1 mysql mysql 125 Jul 8 15:34 mysrv-relay-bin.index
drwx--S--- 2 mysql mysql 4096 Jun 30 17:15 performance_schema
drwx--S--- 2 mysql mysql 4096 Jun 30 18:15 prod
-rw-rw---- 1 mysql mysql 58 Jul 8 15:34 relay-log.info
drwx--S--- 2 mysql mysql 4096 Jun 30 17:15 test


[root@mysrv ~]# mysqladmin refresh -u root -p
Enter password:

[root@mysrv mysql]# ls -l
total 29952
-rw-rw---- 1 mysql mysql 56 Jun 30 17:12 auto.cnf
-rw-rw---- 1 mysql mysql 18874368 Jul 8 15:17 ibdata1
-rw-rw---- 1 mysql mysql 5242880 Jul 8 15:17 ib_logfile0
-rw-rw---- 1 mysql mysql 5242880 Jun 30 17:12 ib_logfile1
-rw-rw---- 1 mysql mysql 124 Jul 8 15:17 master.info
drwx--S--- 2 mysql mysql 4096 Jun 30 17:15 mysql
-rw-rw---- 1 mysql mysql 114 Jun 30 17:15 mysql-bin.000001
-rw-rw---- 1 mysql mysql 63438 Jun 30 17:15 mysql-bin.000002
-rw-rw---- 1 mysql mysql 1096670 Jun 30 17:15 mysql-bin.000003
-rw-rw---- 1 mysql mysql 252 Jun 30 17:26 mysql-bin.000004
-rw-rw---- 1 mysql mysql 114 Jun 30 17:40 mysql-bin.000005
-rw-rw---- 1 mysql mysql 133 Jun 30 17:51 mysql-bin.000006
-rw-rw---- 1 mysql mysql 114 Jun 30 17:56 mysql-bin.000007
-rw-rw---- 1 mysql mysql 114 Jul 8 15:17 mysql-bin.000008
-rw-rw---- 1 mysql mysql 157 Jul 8 15:18 mysql-bin.000009
-rw-rw---- 1 mysql mysql 157 Jul 8 15:20 mysql-bin.000010
-rw-rw---- 1 mysql mysql 157 Jul 8 15:24 mysql-bin.000011
-rw-rw---- 1 mysql mysql 157 Jul 8 15:34 mysql-bin.000012
-rw-rw---- 1 mysql mysql 157 Jul 8 15:36 mysql-bin.000013
-rw-rw---- 1 mysql mysql 114 Jul 8 15:36 mysql-bin.000014
-rw-rw---- 1 mysql mysql 266 Jul 8 15:36 mysql-bin.index
-rw-rw---- 1 mysql mysql 26671 Jul 8 15:35 mysrv.err
-rw-rw---- 1 mysql mysql 5 Jul 8 15:17 mysrv.pid
-rw-rw---- 1 mysql mysql 163 Jul 8 15:18 mysrv-relay-bin.000003
-rw-rw---- 1 mysql mysql 163 Jul 8 15:20 mysrv-relay-bin.000004
-rw-rw---- 1 mysql mysql 163 Jul 8 15:24 mysrv-relay-bin.000005
-rw-rw---- 1 mysql mysql 163 Jul 8 15:34 mysrv-relay-bin.000006
-rw-rw---- 1 mysql mysql 163 Jul 8 15:36 mysrv-relay-bin.000007
-rw-rw---- 1 mysql mysql 114 Jul 8 15:36 mysrv-relay-bin.000008
-rw-rw---- 1 mysql mysql 150 Jul 8 15:36 mysrv-relay-bin.index
drwx--S--- 2 mysql mysql 4096 Jun 30 17:15 performance_schema
drwx--S--- 2 mysql mysql 4096 Jun 30 18:15 prod
-rw-rw---- 1 mysql mysql 58 Jul 8 15:36 relay-log.info
drwx--S--- 2 mysql mysql 4096 Jun 30 17:15 test


3、查看和日志相关的参数:
mysql> show variables like '%log%';
+-----------------------------------------+---------------------------------------------+
| Variable_name | Value |
+-----------------------------------------+---------------------------------------------+
| back_log | 50 |
| binlog_cache_size | 32768 |
| binlog_checksum | NONE |
| binlog_direct_non_transactional_updates | OFF |
| binlog_format | MIXED |
| binlog_row_image | FULL |
| binlog_rows_query_log_events | OFF |
| binlog_stmt_cache_size | 32768 |
| expire_logs_days | 0 |
| general_log | OFF |
| general_log_file | /usr/local/mysql/data/mysql/mysrv.log |
| innodb_flush_log_at_trx_commit | 1 |
| innodb_locks_unsafe_for_binlog | OFF |
| innodb_log_buffer_size | 8388608 |
| innodb_log_file_size | 5242880 |
| innodb_log_files_in_group | 2 |
| innodb_log_group_home_dir | ./ |
| innodb_mirrored_log_groups | 1 |
| innodb_undo_logs | 128 |
| log_bin | ON <span style="color:#ff0000;"> ;是否开启二进制日志 </span> |
| log_bin_basename | /usr/local/mysql/data/mysql/mysql-bin |
| log_bin_index | /usr/local/mysql/data/mysql/mysql-bin.index |
| log_bin_trust_function_creators | OFF |
| log_error | /usr/local/mysql/data/mysql/mysrv.err |
| log_output | FILE |
| log_queries_not_using_indexes | OFF |
| log_slave_updates | OFF |
| log_warnings | 1 |
| max_binlog_cache_size | 18446744073709547520 |
| max_binlog_size | 1073741824 |
| max_binlog_stmt_cache_size | 18446744073709547520 |
| max_relay_log_size | 0 |
| relay_log | |
| relay_log_basename | |
| relay_log_index | |
| relay_log_info_file | relay-log.info |
| relay_log_info_repository | FILE |
| relay_log_purge | ON |
| relay_log_recovery | OFF |
| relay_log_space_limit | 0 |
| slow_query_log | OFF |
| slow_query_log_file | /usr/local/mysql/data/mysql/mysrv-slow.log |
| sql_log_bin | ON |
| sql_log_off | OFF |
| sync_binlog | 0 |
| sync_relay_log | 0 |
| sync_relay_log_info | 0 |
+-----------------------------------------+---------------------------------------------+
47 rows in set (0.01 sec)

 

mysql 二进制日志应用案例:

事务操作生成二进制日志:

mysql> use prod;
Database changed
mysql> show tables;
+----------------+
| Tables_in_prod |
+----------------+
| t1 |
+----------------+
1 row in set (0.02 sec)

mysql> select * from t1;
+------+-------+
| id | name |
+------+-------+
| 1 | tom |
| 2 | scott |
| 3 | jerry |
+------+-------+
3 rows in set (0.00 sec)

mysql> insert into t1 values (4,'rose');
Query OK, 1 row affected (0.03 sec)

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

查看生成的二进制日志内容:

[root@mysrv mysql]# mysqlbinlog mysql-bin.000014
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#150708 15:36:17 server id 2 end_log_pos 114 Start: binlog v 4, server v 5.6.4-m7-log created 150708 15:36:17
# Warning: this binlog is either in use or was not closed properly.
BINLOG '
8dKcVQ8CAAAAbgAAAHIAAAABAAQANS42LjQtbTctbG9nAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAEzgNAAgAEgAEBAQEEgAAVgAEGggAAAAICAgCAAAAANxYJ/w=
'/*!*/;
# at 114
#150708 15:39:44 server id 2 end_log_pos 189 Query thread_id=5 exec_time=0 error_code=0
SET TIMESTAMP=1436341184/*!*/;
SET @@session.pseudo_thread_id=5/*!*/;
SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1/*!*/;
SET @@session.sql_mode=0/*!*/;
SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
/*!\C utf8 *//*!*/;
SET @@session.character_set_client=33,@@session.collation_connection=33,@@session.collation_server=8/*!*/;
SET @@session.lc_time_names=0/*!*/;
SET @@session.collation_database=DEFAULT/*!*/;
BEGIN
/*!*/;
# at 189
#150708 15:39:44 server id 2 end_log_pos 291 Query thread_id=5 exec_time=0 error_code=0
use prod/*!*/;
SET TIMESTAMP=1436341184/*!*/;
insert into t1 values (4,'rose')
/*!*/;
# at 291
#150708 15:39:44 server id 2 end_log_pos 318 Xid = 23
COMMIT/*!*/;
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;

mysql> insert into t1 values (5,'john');
Query OK, 1 row affected (0.02 sec)

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

[root@mysrv mysql]# strings mysql-bin.000014
5.6.4-m7-log
prod
prod
BEGIN
prod
prod
insert into t1 values (4,'rose')
prod
prod
BEGINw
prod
prod
insert into t1 values (5,'john')w

[root@mysrv mysql]# mysqlbinlog mysql-bin.000014
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#150708 15:36:17 server id 2 end_log_pos 114 Start: binlog v 4, server v 5.6.4-m7-log created 150708 15:36:17
# Warning: this binlog is either in use or was not closed properly.
BINLOG '
8dKcVQ8CAAAAbgAAAHIAAAABAAQANS42LjQtbTctbG9nAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAEzgNAAgAEgAEBAQEEgAAVgAEGggAAAAICAgCAAAAANxYJ/w=
'/*!*/;
# at 114
#150708 15:39:44 server id 2 end_log_pos 189 Query thread_id=5 exec_time=0 error_code=0
SET TIMESTAMP=1436341184/*!*/;
SET @@session.pseudo_thread_id=5/*!*/;
SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1/*!*/;
SET @@session.sql_mode=0/*!*/;
SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
/*!\C utf8 *//*!*/;
SET @@session.character_set_client=33,@@session.collation_connection=33,@@session.collation_server=8/*!*/;
SET @@session.lc_time_names=0/*!*/;
SET @@session.collation_database=DEFAULT/*!*/;
BEGIN
/*!*/;
# at 189
#150708 15:39:44 server id 2 end_log_pos 291 Query thread_id=5 exec_time=0 error_code=0
use prod/*!*/;
SET TIMESTAMP=1436341184/*!*/;
insert into t1 values (4,'rose')
/*!*/;
# at 291
#150708 15:39:44 server id 2 end_log_pos 318 Xid = 23
COMMIT/*!*/;
# at 318
#150708 15:42:47 server id 2 end_log_pos 393 Query thread_id=5 exec_time=0 error_code=0
SET TIMESTAMP=1436341367/*!*/;
BEGIN
/*!*/;
# at 393
#150708 15:42:47 server id 2 end_log_pos 495 Query thread_id=5 exec_time=0 error_code=0
SET TIMESTAMP=1436341367/*!*/;
insert into t1 values (5,'john')
/*!*/;
# at 495
#150708 15:42:47 server id 2 end_log_pos 522 Xid = 25
COMMIT/*!*/;
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
[root@mysrv mysql]#

查看生成的二进制日志:
mysql> show binary logs;
+------------------+-----------+
| Log_name | File_size |
+------------------+-----------+
| mysql-bin.000001 | 114 |
| mysql-bin.000002 | 63438 |
| mysql-bin.000003 | 1096670 |
| mysql-bin.000004 | 252 |
| mysql-bin.000005 | 114 |
| mysql-bin.000006 | 133 |
| mysql-bin.000007 | 114 |
| mysql-bin.000008 | 114 |
| mysql-bin.000009 | 157 |
| mysql-bin.000010 | 157 |
| mysql-bin.000011 | 157 |
| mysql-bin.000012 | 157 |
| mysql-bin.000013 | 157 |
| mysql-bin.000014 | 522 |
+------------------+-----------+
14 rows in set (0.00 sec)


查看日志记录的事件:
mysql> show binlog events;
+------------------+-----+-------------+-----------+-------------+-----------------------------------------+
| Log_name | Pos | Event_type | Server_id | End_log_pos | Info |
+------------------+-----+-------------+-----------+-------------+-----------------------------------------+
| mysql-bin.000001 | 4 | Format_desc | 1 | 114 | Server ver: 5.6.4-m7-log, Binlog ver: 4 |
+------------------+-----+-------------+-----------+-------------+-----------------------------------------+
1 row in set (0.06 sec)


mysql> show binlog events in 'mysql-bin.000014';
+------------------+-----+-------------+-----------+-------------+----------------------------------------------+
| Log_name | Pos | Event_type | Server_id | End_log_pos | Info |
+------------------+-----+-------------+-----------+-------------+----------------------------------------------+
| mysql-bin.000014 | 4 | Format_desc | 2 | 114 | Server ver: 5.6.4-m7-log, Binlog ver: 4 |
| mysql-bin.000014 | 114 | Query | 2 | 189 | BEGIN |
| mysql-bin.000014 | 189 | Query | 2 | 291 | use `prod`; insert into t1 values (4,'rose') |
| mysql-bin.000014 | 291 | Xid | 2 | 318 | COMMIT /* xid=23 */ |
| mysql-bin.000014 | 318 | Query | 2 | 393 | BEGIN |
| mysql-bin.000014 | 393 | Query | 2 | 495 | use `prod`; insert into t1 values (5,'john') |
| mysql-bin.000014 | 495 | Xid | 2 | 522 | COMMIT /* xid=25 */ |
+------------------+-----+-------------+-----------+-------------+----------------------------------------------+
7 rows in set (0.00 sec)


数据恢复案例:
1、模拟数据环境

mysql> select * from t1;
+------+-------+
| id | name |
+------+-------+
| 1 | tom |
| 2 | scott |
| 3 | jerry |
| 4 | rose |
| 5 | john |
+------+-------+
5 rows in set (0.00 sec)

删除数据:
mysql> delete from t1;
Query OK, 5 rows affected (0.02 sec)

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

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


利用日志恢复,将日志生成文本文件进行分析:
[root@mysrv mysql]# mysqlbinlog mysql-bin.000014 >/home/mysql/log14.txt

[root@mysrv mysql]# cat log14.txt
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#150708 15:36:17 server id 2 end_log_pos 114 Start: binlog v 4, server v 5.6.4-m7-log created 150708 15:36:17
# Warning: this binlog is either in use or was not closed properly.
BINLOG '
8dKcVQ8CAAAAbgAAAHIAAAABAAQANS42LjQtbTctbG9nAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAEzgNAAgAEgAEBAQEEgAAVgAEGggAAAAICAgCAAAAANxYJ/w=
'/*!*/;
# at 114
#150708 15:39:44 server id 2 end_log_pos 189 Query thread_id=5 exec_time=0 error_code=0
SET TIMESTAMP=1436341184/*!*/;
SET @@session.pseudo_thread_id=5/*!*/;
SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1/*!*/;
SET @@session.sql_mode=0/*!*/;
SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
/*!\C utf8 *//*!*/;
SET @@session.character_set_client=33,@@session.collation_connection=33,@@session.collation_server=8/*!*/;
SET @@session.lc_time_names=0/*!*/;
SET @@session.collation_database=DEFAULT/*!*/;
BEGIN
/*!*/;
# at 189
#150708 15:39:44 server id 2 end_log_pos 291 Query thread_id=5 exec_time=0 error_code=0
use prod/*!*/;
SET TIMESTAMP=1436341184/*!*/;
insert into t1 values (4,'rose')
/*!*/;
# at 291
#150708 15:39:44 server id 2 end_log_pos 318 Xid = 23
COMMIT/*!*/;
# at 318
#150708 15:42:47 server id 2 end_log_pos 393 Query thread_id=5 exec_time=0 error_code=0
SET TIMESTAMP=1436341367/*!*/;
BEGIN
/*!*/;
# at 393
#150708 15:42:47 server id 2 end_log_pos 495 Query thread_id=5 exec_time=0 error_code=0
SET TIMESTAMP=1436341367/*!*/;
insert into t1 values (5,'john')
/*!*/;
# at 495
#150708 15:42:47 server id 2 end_log_pos 522 Xid = 25
COMMIT/*!*/;
# at 522
#150708 15:56:57 server id 2 end_log_pos 597 Query thread_id=5 exec_time=0 error_code=0
SET TIMESTAMP=1436342217/*!*/;
BEGIN
/*!*/;
# at 597 ;;日志记录的操作事件的编号,如果要恢复前面的数据,需要在delete前停止
#150708 15:56:57 server id 2 end_log_pos 681 Query thread_id=5 exec_time=0 error_code=0
SET TIMESTAMP=1436342217/*!*/;
delete from t1
/*!*/;
# at 681
#150708 15:56:57 server id 2 end_log_pos 708 Xid = 31
COMMIT/*!*/;
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
[root@mysrv mysql]#

利用二进制日志恢复:
[root@mysrv mysql]# mysqlbinlog mysql-bin.000014 --stop-pos=597 |mysql -u root -p
Enter password:

---在delete操作前停止日志的应用

查看已恢复的数据:

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

---前面三行数据由于从master同步而来,在slave日志中没有记载,此次不再做恢复操作

---数据恢复成功!
————————————————
版权声明:本文为CSDN博主「客居天涯」的原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接及本声明。
原文链接:https://blog.csdn.net/lqx0405/article/details/46805067



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