$ ./agent/sbin/mysql-proxy -V
mysql-proxy: error while loading shared libraries: libmysql-chassis.so.0: cannot open shared object file: No such file or directory
mysql-proxy: error while loading shared libraries: libmysql-proxy.so.0: cannot open shared object file: No such file or directory

The error occurred because the mysql-proxy can’t find the library files needed for it. So copy the needed files to necessary directory.

 $ sudo cp /usr/local/lib/libmysql-* /usr/lib/i486-linux-gnu/
 $ mysql-proxy -V
  mysql-proxy 0.7.2
  glib2: 2.20.1
  libevent: 1.3e
  lua: Lua 5.1.4
    LUA_PATH: /usr/local/lib/mysql-proxy/lua/?.lua
    LUA_CPATH: /usr/local/lib/mysql-proxy/lua/?.so
  == plugins ==
  admin: 0.7.0
  proxy: 0.7.0

To load the contents of the world.sql file into MySQL, use the following procedure:

1. Change directory to where the world.sql file is locatedIf your current directory is not the same as the location of the world.sql file, use a cd command to change location.
2. Connect to the MySQL server using the mysql programAt your command-line prompt, issue this command:

   shell> mysql -u root

   This command connects to the server using the MySQL root account to make sure that you’ll have permission to create the world database. The --p option tells mysql to prompt you for the root password. Enter the password when prompted. (Remember that the MySQL root account is not the same as the operating system root account and probably will have a different password.)

3. Create the world database and select it as the default database:In the mysql program, issue the following statements:

   mysql> CREATE DATABASE world;
   mysql> USE world

4. Load the contents of world.sql into the world databaseIssue a SOURCE command to tell mysql to read and process the contents of world.sql:

   mysql> SOURCE world.sql

   You’ll see quite a bit of output as mysql reads queries from the world.sql file and executes them.

After mysql finishes processing the world.sql file, try this statement:

mysql> SHOW TABLES;
+-----------————————--------------+
| Tables_in_world |
+-----------————————--------------+
| City            |
| Country         |
| CountryLanguage |
+-----------————————--------------+

The world tables contain the following types of information:

• Country: Information about countries of the world.
• City: Information about some of the cities in those countries.
• CountryLanguage: Languages spoken in each country.

To see what columns each table contains, use DESCRIBE. For example:

mysql> DESCRIBE Country;
mysql> DESCRIBE City;
mysql> DESCRIBE CountryLanguage

If you garble your GRANT commands or forget passwords and find that you don’t have access to the critical mysql table even as the root user don’t panic. You can access MySQL without password. Superuser can access MySQL using mysqld_safe command and you can change mysql password. Become the superuser on the operating system (we’re talking now about the Unix root, not the MySQL root) and kill the MySQL process.

Step : 1

Stop MySQL server

shahid@shahid:~$ sudo /etc/init.d/mysql stop
[sudo] password for shahid:
 * Stopping MySQL database server mysqld                                 [ OK ]
shahid@shahid:~$

Step : 2

Make sure MySQL is was not running

shahid@shahid:~$ ps aux | grep mysql
shahid   18751  0.0  0.0   3004   756 pts/5    S+   11:54   0:00 grep mysql
shahid@shahid:~$

Step : 3

Start Mysql using mysqld_safe

shahid@shahid:~$ sudo mysqld_safe --skip-grant-tables
nohup: ignoring input and redirecting stderr to stdout
Starting mysqld daemon with databases from /var/lib/mysql
mysqld_safe[19285]: started

Step : 4

Make sure you can now get access to the mysql database:

shahid@shahid:~$ mysql mysql
mysql>

Assign a password once again to the MySQL root user:

mysql> UPDATE mysql.user SET Password=PASSWORD('newpassword') WHERE User='root' AND Host='localhost';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
mysql>

Step : 5

Terminate the MySQL server and restart it in the usual way. Make any necessary changes to the privileges through GRANT commands, running mysql as the root user.

shahid@shahid:~$ sudo /etc/init.d/mysql start
 * Starting MySQL database server mysqld                                 [ OK ]
 * Checking for corrupt, not cleanly closed and upgrade needing tables.
shahid@shahid:~$