Auto commit for MySQL databases

In corporate database systems, it is generally preferred to build transaction stacks. This allows for having multiple database statements run and be finally committed if everything is ok. In MySQL, auto commit is on by default; which means that every statement is instantly committed. To check the value of auto commit, run the following MySQL command:

mysql>select @@autocommit;

So in order to turn off auto commit, run the following command in MySQL:

mysql>SET autocommit=0

If you want auto commit turned off permanently, we need to edit your my.cnf file. In the [mysqld], add the following line:

init_connect='SET autocommit=0'

Restart MySQL and you are now ready to do full transaction processing.

Access to MySQL

To gain access to MySQL run the following command:

mysql -u root -p mysql

You will be prompted for the root password.

mysqladmin command to change root password

If you have never set a root password for MySQL, the server does not require a password at all for connecting as root. To setup root password for first time, use mysqladmin command at shell prompt as follows:

$ mysqladmin -u root password NEWPASSWORD

However, if you want to change (or update) a root password, then you need to use following command

$ mysqladmin -u root -p oldpassword newpass

Enter password:

Change MySQL password for other user

To change a normal user password you need to type (let us assume you would like to change password for vivek):

$ mysqladmin -u vivek -p oldpassword newpass

Changing MySQL root user password using mysql sql command

This is another method. MySQL stores username and passwords in user table inside MySQL database. You can directly update password using the following method to update or change password for user vivek:

1) Login to mysql server, type following command at shell prompt:

$ mysql -u root -p

2) Use mysql database (type command at mysql> prompt):

mysql> use mysql;

3) Change password for user vivek:

mysql> update user set password=PASSWORD("NEWPASSWORD") where User='vivek';

4) Reload privileges:

mysql> flush privileges;
mysql> quit

This method you need to use while using PHP or Perl scripting.