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CHAPTER 25 • INTRODUCING MYSQLwww.it-ebooks.info• The total number of queries, updates, and connections allowed on an hourlybasis.• Whether a user must present a valid SSL certificate to connect to the database.• Which actions are available to a user for a given database, table, and even column.For example, you might allow a user UPDATE privileges for the e-mail column of acorporate employee table, but deny DELETE privileges.In addition, MySQL tracks numerous metrics regarding all aspects of database interaction, such asthe total incoming and outgoing bytes transferred, counts of every query type executed, and totalthreads open, running, cached, and connected. It also tracks the number of queries that have surpasseda certain execution threshold, total queries stored in the cache, uptime, and much more. Such numbersare invaluable for continuously tuning and optimizing your server throughout its lifetime.Because of the importance of these options, they’re returned to repeatedly throughout theforthcoming chapters. Specifically, part of Chapter 26 is devoted to MySQL configuration, and the wholeof Chapter 29 is dedicated to MySQL security.Flexible Licensing OptionsMySQL offers two licensing options.MySQL Open Source LicenseMySQL AB offers a free version of its software under the terms of the GNU General Public License (GPL).If your software is also licensed under the GPL, you’re free to use MySQL in conjunction with yourapplication; you can even modify it and redistribute it, provided that you do it all in accordance with theterms set forth in the GPL. Learn more about the terms of the GPL atwww.fsf.org/licensing/licenses/gpl.html.Recognizing that not all users wish to release their software under the restrictive terms of the GPL,MySQL is also available under Sun’s Free and Open Source License (FOSS) Exception, which allows youto use MySQL in conjunction with software released under a number of other popular open sourcelicenses such as the Apache Software License, the BSD license, the GNU Lesser General Public License(LGPL), and the PHP License. More information about the FLOSS Exception, including the list ofaccepted licenses, is available at www.mysql.com/about/legal/licensing/foss-exception/. Please reviewthe specific terms set forth in the FLOSS Exception before coming to the conclusion that it’s suitable foryour needs.Commercial LicenseThe MySQL Commercial License is available if you would rather not release or redistribute your projectcode, or if you want to build an application that is not licensed under the GPL or another compatiblelicense. If you choose the MySQL Commercial License, pricing options are quite reasonable, and eachoption comes with a certain level of guaranteed support. See the MySQL Web site for the latest detailsregarding these options.480