数据迁移
直接查询、插入
同库
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| insert into dst_tb select * from src_tb;
insert into dst_tb(field1, field2, ...) select (field_a, field_b, ...) from src_tb;
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异库、同服务器
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| insert into db1.dst_db select * from db2.src_db;
# 插入已有表
create table db1.dst_tb as select * from db2.src_tb;
# 创建表并插入数据
rename table src_db.src_tb to dst_db.dst_tb;
# 重命名迁移完整表
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异服务器
文件中介、跨实例
.sql
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| $ mysqldump [-u user] -p --single-transaction [--where=""] src_db src_tb > src_db.src_tb.sql
# 导入数据
# 加上`-d`仅导出表结构
$ mysql [-u user] -p dst_db < src_db.src_tb.sql
# 导入数据
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| source src_db.src_tb.sql;
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.csv
secure_file_priv
load data infile和into outfile需要mysql开启
secure_file_priv选项，可以通过查看
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| show global variables like `%secure%`;
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mysql默认值NULL不允许执行，需要更改配置文件
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| [mysqld]
secure_file_priv=''
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本机Server
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| select * from src_tb into outfile file_name.csv
fields terminated by ','
optionally enclosed by '"'
escaped by '"'
lines terminated by '\r\n';
# 导出至`.csv`
load data infile file_name.csv [replace] into table dst_tb(field1, field2, @dummy...)
fields terminated by ','
optionally enclosed by '"'
escaped by '"'
lines terminated by '\r\n';
# 从`.csv`数据导入
# 表结构不同时可以设置对应字段，多余字段`@dummy`表示丢弃
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异机Server
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| $ mysql -h host -u user -p src_db -N -e "select * from src_tb;" > file_name.csv
# 只能通过*shell*查询并导出至文件
# 需要`file`权限
# `-N`：skip column names
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| load data local infile filename.csv;
# 指定`local`则从*client*读取文件，否则从*server*读取
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大表分块迁移
注意
