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• MySQL 3.23. N: The first version of this series, 3.23.0, was published in August 1999. Since 3.23.32 (January 2001) MySQL 3.23. N has been considered stable.
The current version is 3.23.58. Although MySQL 3.23 does not contain many of the innovations of recent years, it is the version most in use among Internet providers. There will be no further extensions toMySQL 3.23. New versions will only fix discovered errors or security holes. N: The first version of this series, 4.0.0, was published in October 2001. Since March 2003 (4.0.12) MySQL 4.0.
N has been considered stable and is now recommended for production use. The current version is 4.0.23. As with MySQL 3.23, new versions appear only to correct bugs. • MySQL 4.1.n: The first version in this series (4.1.0) has been available for download since April 2003. Since October 2004 (version 4.1.7), MySQL 4.1. N has been considered stable and is recommended for production use.
N: The first version in this series (5.0.0) has been available since December 2003 for download. Chapter table of contents: What is MySQL? Part 1: Part 2: Part 3: Part 4: MySQL version numbers Part 5: Part 6: Part 7: Alpha, Beta,Gamma, Production (Generally Available) MySQL versions are identified by the attributes alpha, beta, gamma, and production: • Alpha means that the version is in the throes of the development process and that new functions and even incompatible changes are to be expected.
Although an alpha version is not published until it contains no known errors, it is highly probable that many undiscovered errors still lurk within. Loss of data during testing of an alpha version is quite possible! Alpha versions are of interest only to developers who wish to try out the latest features of MySQL. • Beta means that this version is largely complete, but it has not been thoroughly tested. Major changes are not expected. • Gamma means that the beta versions have become more or less stable.
The goal now is to discover errors and resolve them. • Production or Generally Available (GA) means that MySQL developers have the impression that the version is mature and stable enough that it can be used for mission-critical purposes. According to the MySQL documentation, in production versions, only corrections, and no new functionality, are to be expected. However, this has not always held true in the past, and even with stable versions substantial changes have been made. Of particular note is the case of MySQL 3.23. After the version had been declared stable (3.23.32), there came general support for InnoDB and BDB tables (3.23.34), and later, integrity rules for InnoDB tables (3.23.44).
Furthermore, many minor extensions were introduced. As a rule, MySQL developers are pleased with such extensions, but at the same time, compatibility problems among different production versions can arise.
In practice, this means that a new MySQL version (that is, n.n.0) always has the status alpha. With higher version numbers, the status rises to beta, gamma, and finally, production.
Normal MySQL users should use exclusively MySQL versions that have the status production. If you are developing Web applications, you should find out which version your Internet service provider is using. Chapter table of contents: What is MySQL? Part 1: Part 2: Part 3: Part 4: MySQL version numbers Part 5: Part 6: Part 7: The above tip is excerpted from from Chapter 1, 'What is MySQL?' Of The Definitive Guide to MySQL 5 by Michael Kofler, courtesy of Apress. Find it helpful? About the author: Michael Kofler holds a Ph.D.