If you have not included the path in your Environment Variable then add them. Default password would be blank for root user. You can create more users from root as Security measures.
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To install MySQL you will first need to download the appropriate installs from href="http://www.mysql.com">www.mysql.com . To install on a href="http://www.redhat.com">Red Hat
Once MySQL is installed you will need to check and see if it is running. MySQL is a database server, so it offers connections in the same way a web or a mail server would. To check to see if the server 'mysqld' is running issue: ps -aux | grep mysql