分类： Mysql/postgreSQL
2009-07-19 20:14:05
The MySQL naming scheme uses release names that consist of three numbers and a suffix; for example, mysql-4.1.2-alpha. The numbers within the release name are interpreted like this:
The first number (4) is the major version and also describes the file format. All Version 4 releases have the same file format.
The second number (1) is the release level. Taken together, the major version and release level constitute the release series number.
The third number (2) is the version number within the release series. This is incremented for each new release. Usually you want the latest version for the series you have chosen.
For each minor update, the last number in the version string is incremented. When there are major new features or minor incompatibilities with previous versions, the second number in the version string is incremented. When the file format changes, the first number is increased.
Release names also include a suffix to indicate the stability level of the release. Releases within a series progress through a set of suffixes to indicate how the stability level improves. The possible suffixes are:
alpha indicates that the release contains some large section of new code that hasn't been 100% tested. Known bugs (usually there are none) should be documented in the News section of the online manual at http://dev.mysql.com/doc/mysql/en/News.html. There are also new commands and extensions in most alpha releases. Active development that may involve major code changes can occur in an alpha release, but everything will be tested before issuing a release. For this reason, there should be no known bugs in any MySQL release.
beta means that all new code has been tested. No major new features that could cause corruption in old code are added. There should be no known bugs. A version changes from alpha to beta when there haven't been any reported fatal bugs within an alpha version for at least a month and we have no plans to add any features that could make any old command unreliable.
gamma is a beta that has been around a while and seems to work fine. Only minor fixes are added. This is what many other companies call a release.
If there is no suffix, it means that the version has been run for a while at many different sites with no reports of bugs other than platform-specific bugs. Only critical bugfixes are applied to the release. This is what we call a production (stable) release.
