MySQL Configuration and Installation - Testing MySQL
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After MySQL has been successfully installed, the base tables have been initialized, and the server has been started, you can verify that all is working as it should via some simple tests.
Note that all these commands should be run from your UNIX or Windows command prompt. I am assuming here that you are running them from your MySQL installation directory (as per the examples in the section “Installing and Configuring MySQL,” this will be either /usr/local/mysql in UNIX or c:\program files\ mysql in Windows).
Use the mysqladmin Utility to Obtain Server Status
The mysqladmin utility is usually located in the bin subdirectory of your MySQL installation. You can execute it by changing to that directory and executing the following command:
[root@host]# mysqladmin version
You should see something resembling the output shown in Figure 3-22.
Figure 3-22. The output of a call to mysqladmin
Connect to the Server Using the MySQL Client, and Execute Simple SQL Commands
The MySQL client that ships with the MySQL distribution is named, funnily enough, mysql. Fire it up from your command prompt by switching to the bin directory of your MySQL installation and typing
[root@host]# mysql
You should be rewarded with a mysql> prompt. At this point, you are connected to the MySQL server and can begin executing SQL commands or queries. Here are a few examples, with their output:
mysql> SHOW DATABASES;
+----------+
| Database |
+----------+
| mysql |
| test |
+----------+
2 rows in set (0.13 sec)
mysql> USE mysql;
Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed
mysql> SHOW TABLES;
+-----------------+
| Tables_in_mysql |
+-----------------+
| columns_priv |
| db |
| func |
| host |
| tables_priv |
| user |
+-----------------+
6 rows in set (0.00 sec)
mysql> SELECT COUNT(*) FROM user;
+----------+
| count(*) |
+----------+
| 4 |
+----------+
1 row in set (0.00 sec)
Post-Installation Steps Once testing is complete, you should perform two more tasks to complete your MySQL installation:
Alter the MySQL root Password
When MySQL is first installed, access to the database server is restricted to the MySQL administrator, aka root. By default, this user is initialized with a null password, which is generally considered a Bad Thing. You should therefore rectify this as soon as possible by setting a password for this user via the included mysqladmin utility, using the following syntax in UNIX
[root@host]#
/usr/local/mysql/bin/mysqladmin -u root
password ' <new-password>'
C:\> c:\program files\mysql\bin\mysqladmin -u root
password ' <new-password>'This password change goes into effect immediately, with no requirement to restart the server or flush the privilege table.
Note The MySQL root user is not the same as the system root user on UNIX.
Configure MySQL to Start Automatically When the System Boots up
On UNIX, MySQL comes with a startup/shutdown script, which is the recommended way of starting and stopping the MySQL database server. This script, named mysql.server, is available in the support-files subdirectory of your MySQL installation, and it can be invoked as follows:
[root@host]# /usr/local/mysql/support-files/mysql.server start
[root@host]# /usr/local/mysql/support-files/mysql.server stop
To have MySQL start automatically at boot time, you simply need to copy this script to the /etc/init.d/* directory hierarchy of your system, and then you can invoke it with appropriate parameters from your system’s bootup and shutdown scripts.
To start MySQL automatically on Windows, you can simply add a link to the mysqld server binary to your Startup group. For more information, please refer to Chapter 13.
With a Little Help from My Friends… In case you have problems starting the MySQL server, you can obtain fairly detailed information on what went wrong by looking at the MySQL error log. Most often, this log can be found in the var subdirectory of your MySQL installation, and it is named hostname.err. Other common problems, such as a forgotten superuser password or incorrect path settings, can also be discovered and resolved via a close study of this error log. You can also visit the following resources for advice on how to resolve problems you may encounter during the installation process:The MySQL mailing lists http://lists.mysql.com Google http://www.google.com Google Groups http://groups.google.com If you’re reporting a problem or a bug, remember to use the supplied mysqlbug script to gather necessary system information and include it in your report
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Summary
As a popular open-source application, MySQL is available for a wide variety of platforms and architectures, in both binary and source form. This chapter explained the distinction among the different versions of MySQL, together with recommendations on the most appropriate version for your requirements; it also demonstrated the process of installing MySQL on the two most common platforms, Linux and Windows. It provided installation and configuration instructions for both binary and source distributions and also provided pointers to online resources for other platforms and for detailed troubleshooting advice and assistance.
| DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware. |
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 This article is taken from chapter three of the book My SQL The Complete Reference by Vikram Vaswani (McGraw-Hill/Osborne, 2003; ISBN 0072224770). Check it out at your favorite bookstore. Buy this book now.
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