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1.1 Binary Versus Compiled-From-Source Installations
There are two ways you can install MySQL. As a novice administrator, you may have simply installed a binary package that had precompiled executables, libraries, and configuration files, and placed those files wherever the maker of the binary package decided they should go.
Alternatively, for any number of reasons, you might have decided to compile the MySQL binaries on your own, by downloading a source tarball and configuring the installation to best meet your needs. However, don't do so lightly. Compiling from source has led to countless hours of pain for some users, mostly due to subtle bugs in their compilers or thread libraries. For this very reason, the standard binaries provided by MySQL AB are statically linked. That means they are immune to any bugs in your locally installed libraries.
There aren't too many places where the issue of "binary versus compiled-from-source" will come into play in the average MySQL tuning regimen, but they do happen. For example, in Chapter 10, our advice on chrooting your installation can be used only if every file MySQL needs is brought into a single directory tree, which might not be the case in a binary installation.
For a novice administrator on a simple installation, we recommend using a binary package (such as an RPM) to set up your system. However, once you progress to the point of really needing to tinker with the "guts" of MySQL, you will probably want to quickly go back, change a configure flag, and recompile.
1.1.1 MySQL.com Binary Versus Distribution Binary
For example, you can download the binary installation from the MySQL.com web site. You can also nstall the binary distribution included by your Linux distribution vendor, or the one you grabbed from the FreeBSD ports collection. Finally, you can downloaded a binary for a platform that isn't officially supported, but on which someone is keeping a MySQL version current, such as the Amiga architecture. In any of these cases, you will end up with different directory layouts, compilation options, etc.
If you use the binary distributions from anyone other than MySQL AB, your support options may be significantly decreased, simply by virtue of having limited yourself to seeking help from those who use that particular distribution. Even a question as simple as, "Where is the my.cnf file located on the FreeBSD port of MySQL?" is going to limit those who can respond to two groups: those who have run MySQL using the FreeBSD port, and those on the mailing list or newsgroup, etc. who have encountered that question before. On the plus side, if your distribution has automated security announcements and updates, you probably never need to worry about patching MySQL if a security flaw is discovered.
Many binary distributors of MySQL mold it to fit "their" layout. For example, the Debian distribution places the config files in /etc/mysql/, some language-specific files in /usr/share/mysql/, the executables directly into /usr/bin/, etc. It's not "the Debian way" to segregate an application's binaries; it incorporates them into the system as a whole. Likewise, in those places it does incorporate them, it does so in what may seem like an odd manner. For instance, you might expect config files to go directly into /etc/, but instead they get put in /etc/mysql/. It can be confusing if you're trying to find everything you need to modify, or if you're trying to later convert from one type of installation to the other.
The MySQL.com-supplied tarball binary packages, however, behave more like the source-compilation process. All the files—configuration files, libraries, executables, and the database files themselves—end up in a single directory tree, created specifically for the MySQL install. This is typically /usr/local/mysql, but it can be altered as needed at installation time. Because this behavior is much the same as a source-compiled installation, the available support from the MySQL community is much greater. It also makes things easier if you decide later to instead use a MySQL installation you compile from source.
On the other hand, the MySQL-supplied binary packages that are distributed using package-management formats such as RPM are laid out similarly to the format of the system they are designed for. For example, the RPM installation you get from MySQL.com will have its files laid out similarly to the Red Hat-supplied RPM. This is so because it's not uncommon for a Linux distribution to ship an RPM that hasn't been thoroughly tested and is broken in fairly serious ways. The RPM files MySQL.com distributes are intended as upgrade paths for users with such a problem so they can have "just what they have now, but it works."
Because of that, if you're going to install a binary you download from MySQL.com, we highly recommend using the tarball formatted files. They will yield the familiar directory structure the average MySQL administrator is used to seeing.
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