5 ways to safely and quickly modify Mysql database name _mysql

1. RENAME DATABASE db_name to New_db_name

This one.. This syntax is added to the MySQL 5.1.7, 5.1.23 and removed.
It is said that it is possible to lose data. It's better not to use it.
See: http://dev.mysql.com/doc/refman/5.1/en/rename-database.html

2. If all tables are MyISAM type, you can change the name of the folder
Close Mysqld
Rename the Db_name directory in the data directory to New_db_name
Open mysqld

3. Rename all Tables

Copy Code code as follows:

CREATE DATABASE New_db_name;
RENAME TABLE Db_name.table1 to New_db_name.table1,
Db_name.table2 to New_db_name.table2;
DROP DATABASE db_name;

4. Mysqldump Export Data and import

Copy Code code as follows:

mysqldump-uxxxx-pxxxx-h xxxx db_name > Db_name_dump. Sql
Mysql-uxxxx-pxxxx-h xxxx-e "CREATE DATABASE new_db_name"
mysql-uxxxx-pxxxx-h xxxx New_db_name < Db_name_dump. Sql
Mysql-uxxxx-pxxxx-h xxxx-e "DROP DATABASE db_name"

5. Rename all tables using the shell script

Copy Code code as follows:

#!/bin/bash

mysqlconn= "Mysql-u xxxx-pxxxx-s/var/lib/mysql/mysql.sock-h localhost"
olddb= "Db_name"
newdb= "New_db_name"

# $mysqlconn-E "CREATE DATABASE $newdb"
params=$ ($mysqlconn-N-E "SELECT table_name from INFORMATION_SCHEMA. TABLES WHERE table_schema= ' $olddb ')

for name in $params; Todo
$mysqlconn-E "RENAME TABLE $olddb. $name to $newdb. $name";
Done

# $mysqlconn-E "DROP DATABASE $olddb"

The

is the optimized version of Method 3.

Small Note: All of these actions are dangerous, so please back up your database before performing the operation!!