MySQL在5.1引入了一个rename database操作，但在MySQL5.1.23后又不支持这个命令。可以说是一个实验性的功能，没有在生产中支持过（mysql-5.1 release在mysql-5.1.30）,那么生产中我们有时为了追求完美需要改一下库名。怎么操作呢？
这里提供一个变通的方法。
1. 创建出新库名：

点击(此处)折叠或打开

mysql> create database testbak;

2生成rename语句，从olddb里迁移;
点击(此处)折叠或打开

mysql> select concat("rename table ",table_schema,".",table_name," to testbak.",table_name,";") into outfile '/tmp/rename_to_db_v2.sql' from information_schema.tables where table_schema='test';

[root@host-192-168-1-56 ~]# more /tmp/rename_to_db_v2.sql
rename table test.bc_dbfsxiang to testbak.bc_dbfsxiang;
rename table test.bc_dkfsxiang to testbak.bc_dkfsxiang;
rename table test.bc_dkytxiang to testbak.bc_dkytxiang;
rename table test.bc_gzffxiang to testbak.bc_gzffxiang;
rename table test.bc_option_map to testbak.bc_option_map;
rename table test.bc_qylxxiang to testbak.bc_qylxxiang;
rename table test.bc_service_city to testbak.bc_service_city;
rename table test.bc_service_qi_city to testbak.bc_service_qi_city;
rename table test.bc_wffkhyxiang to testbak.bc_wffkhyxiang;
rename table test.bc_wffkzyxiang to testbak.bc_wffkzyxiang;
rename table test.bc_xindai to testbak.bc_xindai;
rename table test.bc_xindai_fields_v to testbak.bc_xindai_fields_v;
rename table test.bc_xindai_geren to testbak.bc_xindai_geren;
rename table test.bc_xindai_qiye to testbak.bc_xindai_qiye;
rename table test.bc_xyjlxiang to testbak.bc_xyjlxiang;
rename table test.bc_zyyqxiang to testbak.bc_zyyqxiang;
rename table test.fake_names to testbak.fake_names;
rename table test.idmap to testbak.idmap;
rename table test.sbtest to testbak.sbtest;
rename table test.tbUser to testbak.tbUser;
rename table test.test to testbak.test;
rename table test.test2 to testbak.test2;

3 执行即可

点击(此处)折叠或打开

mysql> source /tmp/rename_to_db_v2.sql;

原文地址：http://wubx.net/tips-mysql-rename-database/

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【Mysql】改数据库库名操作

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