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MySQL 8.4 Reference Manual  /  ...  /  Making a Copy of a Database

9.4.5.1 复制数据库

$> mysqldump db1 > dump.sql
$> mysqladmin create db2
$> mysql db2 < dump.sql

Do not use --databases on the mysqldump command line because that causes USE db1 to be included in the dump file, which overrides the effect of naming db2 on the mysql command line.