1.备份数据库的操作

# 导出单个数据库
mysqldump -uroot -p --default-character-set='utf8' cms_management > cms_management20200218.sql

# 只导出数据库结构
mysqldump --opt -d cms_management -uroot -p --default-character-set='utf8'  > cms_management20200218.sql

# 导出所有数据库
all-databases


2.设置主从常用的问题处理

# 主从跳过某条数据语句
stop slave;
set global sql_slave_skip_counter=1;
start slave;

跳过某种事件的my.cnf配置：
[mysqld]下加一行 slave_skip_errors = 1062

MySQL最大可使用内存（M）：

select (@@key_buffer_size +@@innodb_buffer_pool_size + @@tmp_table_size + @@max_connections*(@@read_buffer_size + @@read_rnd_buffer_size + @@sort_buffer_size + @@join_buffer_size + @@binlog_cache_size + @@thread_stack) )/1024/1024  as "Total_AllMem result";


3.数据库监控中用到的默认配置 .my.cnf
[client]
user=username
password=password


4.binlog日志的清理和设置
# 设置bin-log日志保存时长，如果时间过长会导致磁盘占用空间很大

# 保存15天，然后删除超过15天的日志
mysql> set global expire_logs_days=15;
Query OK, 0 rows affected (0.00 sec)

# 删除超过15天的日志
mysql> flush logs;
Query OK, 0 rows affected (0.18 sec)


# 清理 某个binlog之前的binlog文件
purge binary logs to 'mysql-bin.000356';

将指定时间之前的binlog清掉:
purge binary logs before '2019-05-29 00:00:00';


5.mysql数据库的授权


mysql5.7 授权：
GRANT RELOAD, PROCESS, SUPER, LOCK TABLES, REPLICATION CLIENT, CREATE TABLESPACE ON *.* TO 'xtrabackup'@'localhost' identified by 'pass';
flush privileges;

grant select,insert,update,delete on ws_dr_member.* to ws_dr_member_user@"%" identified by "pass";


# 赋权给一个账号多个数据库权限
grant select,insert,update,delete on spyapolloconfigdb.* to spyapoll_user@"%" identified by "pass";
grant select,insert,update,delete on spyapolloportaldb.* to spyapoll_user@"%";


# 授权某个数据库存储过程的创建，修改，执行的权限
GRANT CREATE ROUTINE,ALTER ROUTINE, EXECUTE ON cms_marketing.* TO 'cms_marketing'@'%';

GRANT CREATE TEMPORARY TABLES, EXECUTE, CREATE VIEW, CREATE ROUTINE, ALTER ROUTINE ON `cms_marketing`.* TO 'cms_marketing'@'%'

# 添加root localhost的权限
GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY 'pass' WITH GRANT OPTION;
GRANT ALL PRIVILEGES ON *.* TO 'root'@'127.0.0.1' IDENTIFIED BY 'pass' WITH GRANT OPTION;

GRANT ALL PRIVILEGES ON *.* TO 'root'@'127.0.0.1' WITH GRANT OPTION;


# mysql5.7修改root账号密码

update user set authentication_string = password('pass'), password_expired = 'N', password_last_changed = now() where user = 'root' host='localhost';

# 修改root密码
mysql> update mysql.user set authentication_string = password('pass'), password_expired = 'N', password_last_changed = now() where user = 'root';
mysql> flush privileges;


# 查看授权，及收回授权
mysql> show grants for antiadmin@'localhost';
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Grants for antiadmin@localhost                                                                                                                                          |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, PROCESS, ALTER, SUPER, LOCK TABLES, REPLICATION CLIENT, CREATE TABLESPACE ON *.* TO 'antiadmin'@'localhost' |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

mysql> revoke CREATE, DROP, RELOAD, PROCESS, ALTER, SUPER, LOCK TABLES, REPLICATION CLIENT, CREATE TABLESPACE ON *.* from 'antiadmin'@'localhost';
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> show grants for antiadmin@'localhost';
+------------------------------------------------------------------------+
| Grants for antiadmin@localhost                                         |
+------------------------------------------------------------------------+
| GRANT SELECT, INSERT, UPDATE, DELETE ON *.* TO 'antiadmin'@'localhost' |
+------------------------------------------------------------------------+
1 row in set (0.00 sec)


mysql8.0授权：
# 备份账号
create user 'xtrabackup'@'localhost' identified with mysql_native_password by 'pass';
GRANT RELOAD, PROCESS, SUPER, LOCK TABLES, REPLICATION CLIENT, CREATE TABLESPACE ON *.* TO 'xtrabackup'@'localhost';

# 添加监控用户
create user 'zabbix_montior_user'@'localhost' identified with mysql_native_password by 'pass';
grant select,process,replication client on *.* to zabbix_montior_user@'localhost';
flush privileges;


mysql8.0创建账号，添加权限：
CREATE USER 'online_video_user'@'%' IDENTIFIED BY 'pass';
grant all privileges on vidcloud_res_oa.* TO 'online_video_user'@'%' WITH GRANT OPTION;
grant all privileges on ove.* TO 'online_video_user'@'%' WITH GRANT OPTION;


CREATE USER 'online_video_back_user'@'%' IDENTIFIED BY 'pass';
grant all privileges on vidcloud_res_oa.* TO 'online_video_back_user'@'%';
grant all privileges on ove.* TO 'online_video_back_user'@'%';    
flush privileges;


# 修改root密码
alter user'root'@'localhost' IDENTIFIED BY 'pass';

# 添加root账号
CREATE USER 'root'@'127.0.0.1' IDENTIFIED BY 'pass';
grant all privileges on *.* TO 'root'@'127.0.0.1' WITH GRANT OPTION;


# 回收权限
语法 : revoke 权限 on 数据库.数据库表 from '用户名'@'ip';

案例:revoke all privileges on ove.* from 'graphics_user_write'@'172.30.0.%';

CREATE USER 'ove_user'@'172.30.0.%' IDENTIFIED BY 'pass';
grant select,insert,update,delete ON ove.* TO 'ove_user'@'172.30.0.%';

CREATE USER 'ove_read'@'172.30.0.%' IDENTIFIED BY 'pass';
grant select on ove.* TO 'ove_read'@'172.30.0.%';


CREATE USER 'vid_user'@'172.30.0.%' IDENTIFIED BY 'pass';
grant select,insert,update,delete on vidcloud_res_oa.* TO 'vid_user'@'172.30.0.%';



# 批量kill mysql的进程
for id in `mysqladmin -uroot -p"pass" processlist|grep -i "unauthenticated"|awk '{print $2}'`
do
    mysqladmin -uroot -p"pass" kill ${id}
done


## 主从复制错误
               Last_SQL_Error: Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Worker 0 failed executing transaction 'ANONYMOUS' at master log mysql-bin.000308, end_log_pos 27654. See error log and/or performance_schema.replication_applier_status_by_worker table for more details about this failure or others, if any.
  Replicate_Ignore_Server_Ids:

# 主库查看binlog日志的内容
[root@newcms:/data/mysql_data]# mysqlbinlog --base64-output=DECODE-ROWS -v --start-position=27654 --stop-position=27654 mysql-bin.000308|more
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;


# mysql8 删除用户
DROP USER 'xtrabackup'@'localhost';

# 创建备份账号
create user xtrabackup@'localhost' identified by "pass";
grant selecton *.* to xtrabackup@'localhost';
grant file on *.* to xtrabackup@'localhost';
grant show view on *.* to xtrabackup@'localhost';
grant lock tables on *.* to xtrabackup@'localhost';
grant trigger on *.* to xtrabackup@'localhost';
grant EVENT on *.* to xtrabackup@'localhost';
grant reload on *.* to xtrabackup@'localhost';
GRANT BACKUP_ADMIN ON *.* TO xtrabackup@'localhost';
grant process on *.* to xtrabackup@'localhost';
grant super on *.* to xtrabackup@'localhost';
grant Replication client on *.* to xtrabackup@'localhost';
GRANT SELECT ON performance_schema.variables_info TO 'xtrabackup'@'localhost'; # For release 8.0.16 and later
GRANT SELECT ON performance_schema.* TO 'xtrabackup'@'localhost'; # For release 8.0.16 and later
GRANT CREATE, INSERT, DROP, UPDATE ON mysql.backup_progress TO 'xtrabackup'@'localhost';
GRANT CREATE, INSERT, DROP, UPDATE, SELECT, ALTER ON mysql.backup_history TO 'xtrabackup'@'localhost';
GRANT SELECT ON performance_schema.replication_group_members TO 'xtrabackup'@'localhost';
ALTER USER xtrabackup@'localhost' IDENTIFIED WITH mysql_native_password BY 'pass';
ALTER USER `xtrabackup`@`localhost` PASSWORD EXPIRE NEVER;
ALTER USER `xtrabackup`@`localhost` WITH MAX_USER_CONNECTIONS 20;
flush privileges;