MySQL – Grant Select on All Databases Except One

MySQLmysql-5.5permissions

I have user called test_user created under MySQL 5.5.17 under MS Windows 2008R2, I want to grant this user select privileges on all databases except MySQL database, note I have around 200 database inside this instance.

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Best Answer

Run the output of the following query:

SELECT CONCAT("GRANT SELECT ON ",SCHEMA_NAME,".* TO 'test_user'@'localhost';")
FROM information_schema.SCHEMATA 
WHERE SCHEMA_NAME NOT LIKE 'mysql';

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It is impossible to do this using permissions only .

The only way is to create a stored procedure as described here

If you want to avoid stored procedures, a workaround is: GRANT ALL PRIVILEGES ONtestuser_%. * TO 'testuser'@'%'; (as suggested here); however, this has the problem that the users must then be very careful in naming their databases.

For example if user aaa creates database bbb_xyz, it can then be accessed exclusively by user bbb but not by user aaa.

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There is no "mass revoke" statement so you best option to change this is to update the users table:

UPDATE mysql.user SET Grant_priv = 'N' WHERE user != 'root';

Not that occasionally, there are users that should have grant privileges (and should have that) which are not named root. On my system, for example, I have debian-sys-maint (which I actually wonder if they should have grant privileges, but that's how it's installed).

Do not forget to reload the privileges after changing the user table:

FLUSH PRIVILEGES;

You can find more information on http://dev.mysql.com/doc/refman/5.5/en/privilege-changes.html.

Best Answer

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