How do I quickly rename a MySQL database (change s

Question

The MySQL manual at MySQL covers this.

Usually I just dump the database and reimport it with a new name. This is not an option for very big databases. Apparently RENAME {DATABASE | SCHEMA} db_name TO new_db_name; does bad things, exist only in a handful of versions, and is a bad idea overall.

This needs to work with InnoDB, which stores things very differently than MyISAM.

Answer 1

I did it this way: Take backup of your existing database. It will give you a db.zip.tmp and then in command prompt write following

"C:\Program Files (x86)\MySQL\MySQL Server 5.6\bin\mysql.exe" -h localhost -u root -p[password] [new db name] < "C:\Backups\db.zip.tmp"

Answer 2

You can use SQL to generate an SQL script to transfer each table in your source database to the destination database.

You must create the destination database before running the script generated from the command.

You can use either of these two scripts (I originally suggested the former and someone "improved" my answer to use GROUP_CONCAT. Take your pick, but I prefer the original):

SELECT CONCAT('RENAME TABLE $1.', table_name, ' TO $2.', table_name, '; ')
FROM information_schema.TABLES 
WHERE table_schema='$1';

or

SELECT GROUP_CONCAT('RENAME TABLE $1.', table_name, ' TO $2.', table_name SEPARATOR '; ')
FROM information_schema.TABLES 
WHERE table_schema='$1';

($1 and $2 are source and target respectively)

This will generate a SQL command that you'll have to then run.

Note that GROUP_CONCAT has a default length limit that may be exceeded for databases with a large number of tables. You can alter that limit by running SET SESSION group_concat_max_len = 100000000; (or some other large number).

Answer 3

You may use this shell script:

Reference: How to rename a MySQL database?

#!/bin/bash
set -e # terminate execution on command failure

mysqlconn="mysql -u root -proot"
olddb=$1
newdb=$2
$mysqlconn -e "CREATE DATABASE $newdb"
params=$($mysqlconn -N -e "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES \
                           WHERE table_schema='$olddb'")
for name in $params; do
      $mysqlconn -e "RENAME TABLE $olddb.$name to $newdb.$name";
done;
$mysqlconn -e "DROP DATABASE $olddb"

It's working:

$ sh rename_database.sh oldname newname

Answer 4

It is possible to rename all tables within a database to be under another database without having to do a full dump and restore.

DROP PROCEDURE IF EXISTS mysql.rename_db;
DELIMITER ||
CREATE PROCEDURE mysql.rename_db(IN old_db VARCHAR(100), IN new_db VARCHAR(100))
BEGIN
SELECT CONCAT('CREATE DATABASE ', new_db, ';') `# create new database`;
SELECT CONCAT('RENAME TABLE `', old_db, '`.`', table_name, '` TO `', new_db, '`.`', table_name, '`;') `# alter table` FROM information_schema.tables WHERE table_schema = old_db;
SELECT CONCAT('DROP DATABASE `', old_db, '`;') `# drop old database`;
END||
DELIMITER ;

$ time mysql -uroot -e "call mysql.rename_db('db1', 'db2');" | mysql -uroot

However any triggers in the target db will not be happy. You'll need to drop them first then recreate them after the rename.

mysql -uroot -e "call mysql.rename_db('test', 'blah2');" | mysql -uroot
ERROR 1435 (HY000) at line 4: Trigger in wrong schema

Answer 5

I've only recently came across a very nice way to do it, works with MyISAM and InnoDB and is very fast:

RENAME TABLE old_db.table TO new_db.table;

I don't remember where I read it but credit goes to someone else not me.

Answer 6

Emulating the missing RENAME DATABASE command in MySQL:

1. Create a new database

2. Create the rename queries with:

   SELECT CONCAT('RENAME TABLE ',table_schema,'.',table_name,
       ' TO ','new_schema.',table_name,';')
   FROM information_schema.TABLES
   WHERE table_schema LIKE 'old_schema';
   

3. Run that output

4. Delete old database

It was taken from Emulating The Missing RENAME DATABASE Command in MySQL.