How do I rename a MySQL database (change schema name)?
database, innodb, mysql, rename
Solution
For InnoDB, the following seems to work: create the new empty database, then rename each table in turn into the new database:
RENAME TABLE old_db.table TO new_db.table;
You will need to adjust the permissions after that.
For scripting in a shell, you can use either of the following:
mysql -u username -ppassword old_db -sNe 'show tables' | while read table; \
do mysql -u username -ppassword -sNe "rename table old_db.$table to new_db.$table"; done
OR
for table in `mysql -u root -ppassword -s -N -e "use old_db;show tables from old_db;"`; do mysql -u root -ppassword -s -N -e "use old_db;rename table old_db.$table to new_db.$table;"; done;
Notes:
- There is no space between the option `-p` and the password. If your database has no password, remove the `-u username -ppassword` part.
If some table has a trigger, it cannot be moved to another database using above method (will result `Trigger in wrong schema` error). If that is the case, use a traditional way to clone a database and then drop the old one:
`mysqldump old_db | mysql new_db`
If you have stored procedures, you can copy them afterwards:
`mysqldump -R old_db | mysql new_db`
Problem
How do I quickly rename a MySQL database (change its schema name)? Usually I just dump a database and re-import 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, exists 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.