MySQL - andreydiveev/wiki GitHub Wiki

Show database size in MB:

SELECT table_schema                                        "DB Name", 
   Round(Sum(data_length + index_length) / 1024 / 1024, 1) "DB Size in MB" 
FROM   information_schema.tables 
GROUP  BY table_schema;

Disable root password on localhost:

SET PASSWORD FOR 'root'@'localhost' = PASSWORD('');