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    Monday, May 20, 2013

    How to create MySQL Database, Tables in Linux

    I have used Red Hat Linux for creating MySQL database so kindly make changes in the commands as
    per your distribution.

    Installing MySQL


    Make sure mysql package is installed in your machine which you can check using
    # rpm -qa | grep mysql
    If nothing comes up you can manually install using
    # yum install mysql
    Now once the package is installed by default
    Admin user : root
    Password : blank

    You will have to assign a password to root
    # mysqladmin -u root password 'new-password'
    OR
    # mysql -u root -p
    Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 1108
    Server version: 5.0.77 Source distribution
    Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
    
    mysql> USE mysql;
    mysql> UPDATE user SET Password=PASSWORD('new-password') WHERE user='root';
    mysql> FLUSH PRIVILEGES;


    Creating database, tables and inserting values into the tables


    Login to mysql

    # mysql -u root -p
    Enter Pasword:
    Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 1108
    Server version: 5.0.77 Source distribution
    Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
    
    mysql> show databases;           -- "Will list all the databases"
    +--------------------+
    | Database           |
    +--------------------+
    | information_schema |
    | mysql              |
    +--------------------+
    
    mysql> create database mycomp; mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | mycomp | +--------------------+ mysql> use mycomp; --"Will connect to specified database" Database changed
    mysql> create table employee (SerialNo varchar(3),Name char(20),Age varchar(2)); Query OK, 0 rows affected (0.01 sec) mysql> describe employee; +----------+------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------+------------+------+-----+---------+-------+ | SerialNo | varchar(3) | YES | | NULL | | | Name | char(20) | YES | | NULL | | | Age | varchar(2) | YES | | NULL | | +----------+------------+------+-----+---------+-------+ 3 rows in set (0.00 sec) mysql> show tables; --To list out available tables in the selected database +----------------+ | Tables_in_test | +----------------+ | employee | +----------------+ 1 row in set (0.00 sec)
    mysql> INSERT INTO employee VALUES ('1','Deepak Prasad','23'); Query OK, 1 row affected (0.00 sec)
    mysql> INSERT INTO employee VALUES ('2','Amit Dubey','24'); Query OK, 1 row affected (0.00 sec) mysql> SELECT * from employee; +----------+---------------+------+ | SerialNo | Name | Age | +----------+---------------+------+ | 1 | Deepak Prasad | 23 | | 2 | Amit Dubey | 24 | +----------+---------------+------+ 2 rows in set (0.00 sec) mysql> quit Bye
    Restarting mysql database
    # /etc/init.d/mysqld restart
    OR
    # service mysqld restart
    Make sure your database is up even after restarting your linux machine
    # chkconfig mysqld on


    Follow the below links for more tutorials:

    Configure Red Hat Cluster using VMware, Quorum Disk, GFS2, Openfiler
    Tutorial for Monitoring Tools SAR and KSAR with examples in Linux
    How to configure Samba 4 Secondary Domain Controller
    How to secure Apache web server in Linux using password (.htaccess)
    How to register Red Hat Linux with RHN (Red Hat Network )
    Red hat Enterprise Linux 5.5 Installation Guide (Screenshots)
    15 tips to enhance security of your Linux machine
    Why is Linux more secure than windows and any other OS
    What is the difference between "su" and "su -" in Linux?
    What is kernel-PAE in Linux?
    What is swappiness and how do we change its value?
    How to log iptables messages in different log file
    What are the s and k scripts in the etc rcx.d directories
    How to check all the currently running services in Linux
    How to auto start service after reboot in Linux
    What is virtual memory, paging and swap space?


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