ERROR 1049 (42000): Unknown database - mysql

Question

I can't seem to login to my tutorial database development environment:
Ayman$ mysql -u blog -p blog_development
Enter password:
ERROR 1049 (42000): Unknown database 'blog_development'
I can login to the database fine without the blog_development portion:
Ayman$ mysql -u blog -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1858
Not sure what gives as I granted all access:
mysql> GRANT ALL PRIVILEGES ON blog_development.*
-> TO 'blog'#'localhost'
-> IDENTIFIED BY 'newpassword';
Query OK, 0 rows affected (0.01 sec)
mysql> SHOW GRANTS FOR 'blog'#'localhost'
-> ;
+----------------------------------------------------------------------------------------- --------------------+
| Grants for blog#localhost |
+----------------------------------------------------------------------------------------- --------------------+
| GRANT USAGE ON *.* TO 'blog'#'localhost' IDENTIFIED BY PASSWORD '*FE4F2D624C07AAEBB979DA5C980D0250C37D8F63' |
| GRANT ALL PRIVILEGES ON `blog`.* TO 'blog'#'localhost' |
| GRANT ALL PRIVILEGES ON `blog_development`.* TO 'blog'#'localhost' |
+----------------------------------------------------------------------------------------- --------------------+
3 rows in set (0.00 sec)
Anybody have a clue what to try? Thanks! Also, side note- is it weird I have multiple root users?:
mysql> select User from mysql.user;
+------+
| User |
+------+
| root |
| root |
| |
| root |
| |
| blog |
| root |
+------+
7 rows in set (0.00 sec)
Edit: for those asking- I created the database blog with the CREATE DATABASE command in MySql. Here are my active databases:
mysql> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| blog |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)

Answer 1

blog_development doesn't exist
You can see this in sql by the 0 rows affected message
create it in mysql with
mysql> create database blog_development
However as you are using rails you should get used to using
$ rake db:create
to do the same task. It will use your database.yml file settings, which should include something like:
development:
adapter: mysql2
database: blog_development
pool: 5
Also become familiar with:
$ rake db:migrate # Run the database migration
$ rake db:seed # Run thew seeds file create statements
$ rake db:drop # Drop the database

Answer 2

Very simple solution.
Just rename your database and configure your new database name in your project.
The problem is the when you import your database, you got any errors and then the database will be corrupted. The log files will have the corrupted database name.
You can rename your database easily using phpmyadmin for mysql.
phpmyadmin -> operations -> Rename database to

Answer 3

Its a common error which happens when we try to access a database which doesn't exist. So create the database using
CREATE DATABASE blog_development;
The error commonly occours when we have dropped the database using
DROP DATABASE blog_development;
and then try to access the database.