CREATE TABLE new_table_name
SELECT * FROM old_table_name;

/* Differences: their names,
if the old table had an index (or key), it
does not transfer to the new table.
only two columns chosen
*/

* Login to SSH as root using a program like putty.
* Type the following command,

/scripts/restartsrv_mysql

Hope you all enjoy this command.

$ mysql -u root –p

Output:

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 16 to server version: 4.1.15-Debian_1-log
Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the buffer.

mysql>

Now setup cache size 32Mb:
mysql> SET GLOBAL query_cache_size = 33554432;    

Query OK, 0 rows affected (0.00 sec)

mysql> SHOW VARIABLES LIKE 'query_cache_size';

Output:

+——————+———-+

| Variable_name | Value |

+——————+———-+

| query_cache_size | 16777216 |

+——————+———-+

You can setup them in /etc/my.cnf (Red Hat) or /etc/mysql/my.cnf (Debian) file:
# vi /etc/my.cnf
Append config directives as follows:

query_cache_size = 33554432
query_cache_type=1
query_cache_limit=2096576

Login with ssh on your hosting server.

then goto mysql

mysql -u dbusername -p databasename < backupname.sql

• dbusername => Your database user name
• databasename => Your Database name
• backupname.sql (with full path where your sql file present)
• then hit enter
• it will ask your password of database
• then click enter

If your hosting company has you on a remote MySQL server, such as mysql.yourhost.com, you will need to add the servername to the command line. The servername will be the same as in your config.php. The command line will be:

mysql -h servername -u dbusername -p databasename < backupname.sql

Or:

mysql -h servername -u dbusername -p databasename < /path/to/backupname.sql

Now you guys have any difficulty post your comments here

If you want to install Mysql Database Server in Ubuntu check this tutorial.

What is Mysql Data Directory?

Mysql data directory is important part where all the mysql Databases storage location.By default MySQL data default directory located in /var/lib/mysql.If you are running out of space in /var partition you need to move this to some other location.

Note:- This is only for advanced users and before moving default directory make a backup of your mysal databases.

Procedure to follow

Open the terminal

First you need to Stop MySql using the following command

sudo /etc/init.d/mysql stop

Now Copy the existing data directory (default located in /var/lib/mysql) using the following command

sudo cp -R -p /var/lib/mysql /path/to/new/datadir

All you need are the data files, so delete the others with the command

sudo rm /path/to/new/datadir

Note:- You will get a message about not being able to delete some directories, but that’s what you want.

Now edit the MySQL configuration file with the following command

gksu gedit /etc/mysql/my.cnf

Look for the entry for “datadir”, and change the path (which should be “/var/lib/mysql”) to the new data directory.

Important Note:-From Ubuntu 7.10 (Gutsy Gibbon) forward, Ubuntu uses some security software called AppArmor that specifies the areas of your filesystem applications are allowed to access. Unless you modify the AppArmor profile for MySQL, you’ll never be able to restart MySQL with the new datadir location.

In the terminal, enter the command

sudo gedit /etc/apparmor.d/usr.sbin.mysqld

Copy the lines beginning with “/var/lib/mysql”, comment out the originals with hash marks (”#”), and paste the lines below the originals.

Now change “/var/lib/mysql” in the two new lines with “/path/to/new/datadir”. Save and close the file.

Restart the AppArmor profiles with the command

sudo /etc/init.d/apparmor reload

Restart MySQL with the command

sudo /etc/init.d/mysql restart

Now MySQL should start with no errors, and your data will be stored in the new data directory location.

Installing Mysql database in Ubuntu

sudo aptitude install mysql-server mysql-client libmysqlclient15-dev

This will complete the installation of mysql server 5.0.45 in ubuntu gutsy.

Configuring Mysql in ubuntu

MySQL initially only allows connections from the localhost (127.0.0.1). We’ll need to remove that restriction if you wish to make it accessible to everyone on the internet. Open the file /etc/mysql/my.cnf

sudo gedit /etc/mysql/my.cnf

Find the line bind-address = 127.0.0.1 and comment it out
…
#bind-address = 127.0.0.1
…

You can check your configuration using the following command

#netstat -tap

Output Looks like below

tcp 0 0 *:mysql *:* LISTEN 4997/mysqld

MySQL comes with no root password as default. This is a huge security risk. You’ll need to set one. So that the local computer gets root access as well, you’ll need to set a password for that too. The local-machine-name is the name of the computer you’re working on. For more information see here

sudo mysqladmin -u root password your-new-password

sudo mysqladmin -h root@local-machine-name -u root -p password your-new-password

sudo /etc/init.d/mysql restart

Manage Mysql using Phpmyadmin

phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web. Currently it can create and drop databases, create/drop/alter tables, delete/edit/add fields, execute any SQL statement, manage keys on fields, manage privileges,export data into various formats and is available in 54 languages. GPL License information.

Install phpmyadmin in ubuntu

sudo aptitude install phpmyadmin

This will complete the installation.

Now you need to goto http://serverip/phpmyadmin/

Login using your mysql root as username and password

It’s key to remember that MySQLTuner is a script which can assist you with your server, but it is not the solution to a badly performing MySQL server. The best performance gains come from a thorough review of the queries sent to the server, and an evaluation of the MySQL server itself. A qualified developer in your application’s programming or scripting language should be able to work with a MySql Databasesadministrator to find improvements for your server. Once the server and application are optimized well, you may need to consider hardware upgrades to the physical server itself.

This is a really useful tool for helping to optimize MySQL performance.Understanding the various my.cnf variables and how they affect performance can seem really complicated but this tool takes some of the pain away and makes it easier to understand the effects of each variable.It is especially useful to be able to see the global memory usage,  memory usage per thread and the maximum possible memory usage – that is really valuable information that is otherwise complex to calculate.

MySQLTuner Features

* Memory Usage: Calculates MySQL memory usage at max load and makes recommendations for  increasing or decreasing the MySQL memory footprint. Per-thread and server-wide buffer data is calculated
separately for an accurate snapshot of the server’s configuration.
* Slow Queries: Reviews the amount of slow queries relative to the total queries. Slow query time limits are also analyzed and recommendations are made.
* Connections: Current and historical connection counts are reviewed.
* Key Buffer: Takes configuration data and compares it to the actual indexes found in MyISAM tables. Key cache hit rates are calculated and variable adjustments are suggested.
* Query Cache: Query cache hit rates and usage percentages are used to make recommendations for the query cache configuration variables.
* Sorting & Joins: Per-thread buffers that affect sorts and joins are reviewed along with the statistics from the queries run against the server.
* Temporary Tables: Variable recommendations are made to reduce temporary tables that are written to the disk.
* Table Cache: Compares total tables opened to the currently open tables. Calculates the table cache hit rate in order to make suggestions.
* Open Files: Determines if the server will approach or run into the open file limit set by the operating system or the MySQL server itself.
* Table Locks: Finds table locking that forces queries to wait and makes suggestions for reducing locks that require a wait.
* Thread Cache: Calculates how many times MySQL must create a new thread to respond to a query.
* Aborted Connections: Finds applications that are not closing connections to MySQL properly.
* Read/Write Ratios: Calculates the percentage of read and write operations on your MySQL installation.

Install Mysqltuner in Ubuntu Intrepid

sudo aptitude install mysqltuner

Or using the following method

Run MySQLTuner in Ubuntu

Download MySQLTuner using the following command

wget http://mysqltuner.com/mysqltuner.pl

To run the script, simply make it executable and run it:

chmod +x mysqltuner.pl

sudo ./mysqltuner.pl

Enter your administrative username and password

You need to check mainly recommendations section at the end. It shows which variables you should adjust in the  section of your my.cnf (on Ubuntu file located at /etc/mysql/my.cnf).