备份单库

mysqldump -u root -p areweb_sxsky_db> areweb_projectmanagement.sql
导入
mysql -u root -p areweb_projectmanagement< areweb_projectmanagement.sql

导入全库

mysql -u username -p < all_databases.sql

mysql数据库备份一句话执行命令

mysqldump --all-databases -h127.0.0.1 -uroot -p123456 > allbackupfile.sql

提示如下提示

[root@yfvyy5b2on3knb8q opt]# mysqldump --all-databases -h127.0.0.1  > allbackupfile.sql
mysqldump: Couldn't execute 'SELECT COLUMN_NAME,                       JSON_EXTRACT(HISTOGRAM, '$."number-of-buckets-specified"')                FROM information_schema.COLUMN_STATISTICS                WHERE SCHEMA_NAME = 'mysql' AND TABLE_NAME = 'columns_priv';': Unknown table 'COLUMN_STATISTICS' in information_schema (1109)

直接上干货解决办法（大概就是直接熟人密码不安全）

vim /etc/my.cnf
添加账户和密码

 重启MySQL服务

[root@yfvyy5b2on3knb8q bin]# service mysql stop
Shutting down MySQL.. SUCCESS!
[root@yfvyy5b2on3knb8q bin]# service mysql start

 继续执行mysqldump命令，提示仍然报错

mysqldump: Couldn't execute 'SELECT COLUMN_NAME,                       JSON_EXTRACT(HISTOGRAM, '$."number-of-buckets-specified"')                FROM information_schema.COLUMN_STATISTICS                WHERE SCHEMA_NAME = 'mysql' AND TABLE_NAME = 'columns_priv';': Unknown table 'COLUMN_STATISTICS' in information_schema (1109)

--column-statistics=0 （版本原因需添加此段内容）

mysqldump  --column-statistics=0 --all-databases -h 127.0.0.1  > /opt/allbackupfile1.sql

导入操作

llbackupfile1.sql  allbackupfile.sql  all_databases_backup.sql  backup.sh  mysql-8.0.36-linux-glibc2.28-x86_64.tar.xz  osmt
[root@yfvyy5b2on3knb8q opt]# mysql -h 127.0.0.1 -P 3306 -u root -p test< allbackupfile1.sql