Mysql8.0的bin log日志

文章目录

- - 一、 Mysql8.0 的bin log 日志关闭

一、 Mysql8.0 的bin log 日志关闭

Mysql8.0默认开启 binlog 记录功能，如果开启 binlog 日志会增加磁盘I/O等的压力。

//  进入MySQL的数据存放目录下
[root@cloudsino ~]# cd /home/mysqldata/
[root@cloudsino mysqldata]# ll binlog*   // 以下都是 binlog 日志
-rw-r----- 1 mysql mysql 56961557 6月  13 17:25 binlog.000045
-rw-r----- 1 mysql mysql    90378 6月  14 23:05 binlog.000046
-rw-r----- 1 mysql mysql 59466966 6月  16 09:57 binlog.000047
-rw-r----- 1 mysql mysql   751828 6月  19 09:07 binlog.000048
-rw-r----- 1 mysql mysql    12685 6月  19 09:30 binlog.000049
-rw-r----- 1 mysql mysql    22958 6月  19 09:47 binlog.000050
-rw-r----- 1 mysql mysql   883441 6月  20 15:07 binlog.000051
-rw-r----- 1 mysql mysql  2598766 6月  26 08:46 binlog.000052
-rw-r----- 1 mysql mysql  1277318 6月  28 10:01 binlog.000053
-rw-r----- 1 mysql mysql      179 6月  28 10:01 binlog.000054
-rw-r----- 1 mysql mysql  4348744 6月  28 16:01 binlog.000055
-rw-r----- 1 mysql mysql   585765 6月  29 16:50 binlog.000056
-rw-r----- 1 mysql mysql     5011 6月  30 17:14 binlog.000057
-rw-r----- 1 mysql mysql    49526 6月  30 17:50 binlog.000058
-rw-r----- 1 mysql mysql  8440556 7月   3 15:27 binlog.000059
-rw-r----- 1 mysql mysql      534 7月   3 15:30 binlog.000060
-rw-r----- 1 mysql mysql 37368758 7月   6 12:27 binlog.000061
-rw-r----- 1 mysql mysql      179 7月   6 12:27 binlog.000062
-rw-r----- 1 mysql mysql   147165 7月   6 17:32 binlog.000063
-rw-r----- 1 mysql mysql   549347 7月   7 11:35 binlog.000064
-rw-r----- 1 mysql mysql  9371743 7月  12 16:33 binlog.000065
-rw-r----- 1 mysql mysql  2285728 7月  12 19:25 binlog.000066
-rw-r----- 1 mysql mysql      352 7月  12 16:33 binlog.index
[root@cloudsino mysqldata]#

1.1、查看是否已开启 bin log 日志

[root@cloudsino ~]# mysql  -uroot -pAgan@3306
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 578
Server version: 8.0.25 MySQL Community Server - GPL

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show variables like 'log_bin';  // 查看bin log 日志是否开启。on 表示开启，off表示关闭
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| log_bin       | ON    |
+---------------+-------+
1 row in set (0.01 sec)

mysql> show master logs;  // 查看现有在用的binlog日志
+---------------+-----------+-----------+
| Log_name      | File_size | Encrypted |
+---------------+-----------+-----------+
| binlog.000045 |  56961557 | No        |
| binlog.000046 |     90378 | No        |
| binlog.000047 |  59466966 | No        |
| binlog.000048 |    751828 | No        |
| binlog.000049 |     12685 | No        |
| binlog.000050 |     22958 | No        |
| binlog.000051 |    883441 | No        |
| binlog.000052 |   2598766 | No        |
| binlog.000053 |   1277318 | No        |
| binlog.000054 |       179 | No        |
| binlog.000055 |   4348744 | No        |
| binlog.000056 |    585765 | No        |
| binlog.000057 |      5011 | No        |
| binlog.000058 |     49526 | No        |
| binlog.000059 |   8440556 | No        |
| binlog.000060 |       534 | No        |
| binlog.000061 |  37368758 | No        |
| binlog.000062 |       179 | No        |
| binlog.000063 |    147165 | No        |
| binlog.000064 |    549347 | No        |
| binlog.000065 |   9371743 | No        |
| binlog.000066 |   3079494 | No        |
+---------------+-----------+-----------+
22 rows in set (0.00 sec)


mysql> reset master;  //  手动清除binlog日志
Query OK, 0 rows affected (0.02 sec)

mysql> exit   //  退出

1.2、关闭 bin log 日志

配置文件的方式 my.cnf :
vim /etc/my.cnf
[mysqld]
skip-log-bin  // 添加这一行，重启 mysql 服务后才生效。

[root@cloudsino ~]# vim /etc/my.cnf
[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove the leading "# " to disable binary logging
# Binary logging captures changes between backups and is enabled by
# default. It's default setting is log_bin=binlog
# disable_log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
#
# Remove leading # to revert to previous value for default_authentication_plugin,
# this will increase compatibility with older clients. For background, see:
# https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_default_authentication_plugin
# default-authentication-plugin=mysql_native_password

#datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-log-bin   // 添加这一行
...省略N
[root@cloudsino ~]# systemctl restart mysqld  // 重启让其生效
[root@cloudsino ~]#
[root@cloudsino ~]# mysql  -uroot -pAgan@3306
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 578
Server version: 8.0.25 MySQL Community Server - GPL

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show variables like 'log_bin';  // 查看bin log 日志是否开启。on 表示开启，off表示关闭
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| log_bin       | OFF   |
+---------------+-------+
1 row in set (0.01 sec)

mysql> 
mysql> show master logs;  // 查看binlog日志报错提醒没有开启binlog
ERROR 1381 (HY000): You are not using binary logging
mysql> 
mysql> exit
Bye
[root@cloudsino ~]# 
[root@cloudsino ~]# ll /home/mysqldata/
总用量 201332
-rw-r----- 1 mysql mysql       56 2月  28 14:15 auto.cnf
-rw------- 1 mysql mysql     1676 2月  28 14:15 ca-key.pem
-rw-r--r-- 1 mysql mysql     1112 2月  28 14:15 ca.pem
-rw-r--r-- 1 mysql mysql     1112 2月  28 14:15 client-cert.pem
-rw------- 1 mysql mysql     1680 2月  28 14:15 client-key.pem
-rw-r----- 1 mysql mysql   196608 7月  12 20:04 #ib_16384_0.dblwr
-rw-r----- 1 mysql mysql  8585216 7月   4 14:41 #ib_16384_1.dblwr
-rw-r----- 1 mysql mysql     6344 7月  12 20:02 ib_buffer_pool
-rw-r----- 1 mysql mysql 12582912 7月  12 20:04 ibdata1
-rw-r----- 1 mysql mysql 50331648 7月  12 20:04 ib_logfile0
-rw-r----- 1 mysql mysql 50331648 7月  12 20:04 ib_logfile1
-rw-r----- 1 mysql mysql 12582912 7月  12 20:02 ibtmp1
drwxr-x--- 2 mysql mysql      187 7月  12 20:02 #innodb_temp
drwxr-x--- 2 mysql mysql      143 2月  28 14:15 mysql
-rw-r----- 1 mysql mysql 37748736 7月  12 20:04 mysql.ibd
drwxr-x--- 2 mysql mysql     8192 2月  28 14:15 performance_schema
-rw------- 1 mysql mysql     1680 2月  28 14:15 private_key.pem
-rw-r--r-- 1 mysql mysql      452 2月  28 14:15 public_key.pem
-rw-r--r-- 1 mysql mysql     1112 2月  28 14:15 server-cert.pem
-rw------- 1 mysql mysql     1680 2月  28 14:15 server-key.pem
drwxr-x--- 2 mysql mysql       28 2月  28 14:15 sys
-rw-r----- 1 mysql mysql 16777216 7月  12 20:04 undo_001
-rw-r----- 1 mysql mysql 16777216 7月  12 20:04 undo_002
[root@cloudsino ~]#

1.3、设置 bin log 日志的时长

1.3.1、第一种设置方式：

编辑 /etc/my.cnf 文件，在 [mysqld] 节点中增加如下两行

# 重启 mysql 服务才能生效
log-bin=mysql-bin   #启动日志
max_binlog_size = 200M  # 默认是 1G
expire_logs_days = 7

max_binlog_size：bin log日志每达到设定大小后，会使用新的bin log日志。如mysql-bin.000002达到200M后，创建并使用mysql-bin.000003文件作为日志记录。

expire_logs_days：保留指定日期范围内的bin log历史日志，上示例设置的7天内。

1.3.2、第二种设置方式

# mysql8.0以下版本查看当前数据库日志binlog保存时效 以天为单位，默认0 永不过期，最多只能设置99天
# show variables like 'expire_logs_days';
# set global expire_logs_days=60;

# mysql8.0以上版本通过设置全局参数binlog_expire_logs_seconds修改binlog保存时间 以秒为单位；
# 默认2592000 30天；
# 14400   4小时；
# 86400  1天；
# 259200  3天
# show variables like '%binlog_expire_logs_seconds%';
# set global binlog_expire_logs_seconds=259200;

[root@cloudsino ~]# mysql -V
mysql  Ver 8.0.25 for Linux on x86_64 (MySQL Community Server - GPL)
[root@cloudsino ~]# mysql  -uroot -pAgan@3306
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 308
Server version: 8.0.25 MySQL Community Server - GPL

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show variables like '%binlog_expire_logs_seconds%'; // 默认 30 天
+----------------------------+---------+
| Variable_name              | Value   |
+----------------------------+---------+
| binlog_expire_logs_seconds | 2592000 |
+----------------------------+---------+

mysql> set global binlog_expire_logs_seconds=259200; // 设置保存3天，重启后失效。
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like '%binlog_expire_logs_seconds%';
+----------------------------+--------+
| Variable_name              | Value  |
+----------------------------+--------+
| binlog_expire_logs_seconds | 259200 |
+----------------------------+--------+
1 row in set (0.00 sec)

mysql> exit
Bye
[root@cloudsino ~]# 
[root@cloudsino ~]#