MySQl Study学习之--MySQl二进制日志管理
MySQL二进制日志(Binary Log)
a、它包括的内容及作用例如以下:
包括了全部更新了数据或者已经潜在更新了数据(比方没有匹配不论什么行的一个DELETE)
包括关于每一个更新数据库(DML)的语句的运行时间信息
不包括没有改动不论什么数据的语句,假设须要启用该选项,须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,由于二进制日志包括备份后进行的全部更新
用于在主复制server上记录全部将发送给从server的语句
启用该选项数据库性能减少1%。但保障数据库完整性,对于关键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]选项或在配置文件里指定log-bin启动时,mysqld写入包括全部更新数据的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文件夹下。
每一个二进制日志名会加入一个数字扩展名用于日志老化,因此不支持自己定义的扩展名。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。则自己主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。也即是事务只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不是全然相等。这点不同于oracle。
二进制日志文件会有一个相应二进制日志索引文件,该文件包括全部的二进制日志,其文件名称与二进制日志同样,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语句将删除全部二进制日志文件。这将影响到从库。也能够用PURGE MASTER LOGS仅仅删除部分二进制文件。
二进制日志记录了全部对数据库运行更改的操作,二进制主要有下面两种作用:
1、恢复(recovery)2、复制(replication)
二进制日志的启动:配置參数log-bin[=name],假设不指定name。则默认二进制日志文件名称为主机名,后缀名为二级制日志的序列号。所在路径为数据库所在文件夹。
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參数:
max_binlog_size、binlog_cache_size、sync_binlog、binlog-do-db、binlog-ignore-db、log-slave-update、binlog_format
1、max_binlog_size,该參数指定了单个二进制日志文件的最大值,假设超过该值。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開始的默认值为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。全部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。当一个线程開始一个事务时。mysql会自己主动分配一个大小为binlog_cache_size的缓存,因此该值得设置须要相当小心,能够通过show global status 查看binlog_cache_use、binlog_cache_disk_use的状态。能够推断当前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、參数sync_binlog=[N]表示每写缓存多少次就同步到磁盘,假设将N设置为1,则表示採用同步写磁盘的方式来写二进制日志。该參数非常重要,这个以后还会提到。值得注意的是,在将该參数设置为1时,也应该将innodb_support_xa设为1来解决。这能够确保二进制日志和InnoDB存储引擎数据文件的同步。
4、參数binlog-do-db和binlog-ignore-db表示须要写入或者忽略写入哪些库的日志,默认值为空,则表示将全部库的日志同步到二进制日志。
5、Log-slave-update该參数在搭建master=>slave=>slave的架构时,须要配置。
6、Binlog_format參数也特别重要。
从mysql5.1版本号開始引入这个參数。该參数能够设置的值有STATEMENT\、ROW、MIXED;
(1)STATEMENT格式和之前的mysql版本号一样,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,此时能够将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默认採用的STATEMENT格式进行二进制日志文件的记录,可是在一些情况下会使用ROW格式。可能的情况包含:
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)使用了暂时表
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
运行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
採用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、查看和日志相关的參数:
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:
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,假设要恢复前面的数据,须要在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
mysql> select * from t1;
+------+------+
| id | name |
+------+------+
| 4 | rose |
| 5 | john |
+------+------+
2 rows in set (0.00 sec)
---前面三行数据因为从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!