MySQL
*****

You need MySQL version 5.0.15 or higher.

It's possible to test which version of MySQL you have installed with:

**mysql -V**


Installing
==========


Windows
-------

Download the MySQL 32-bit or 64-bit MSI installer from the MySQL
website (~28 MB).

MySQL has a standard Windows installer. It's ok to select a Typical
MySQL install (the default). The rest of this documentation assumes
assume you have installed MySQL into "C:\mysql". Adjust paths
appropriately if not.


Linux/Mac OS X
--------------

The package install instructions given previously should have
installed MySQL on your machine, if it didn't come with it already.
Run:

**mysql_secure_installation**

and follow its advice.

If you did install MySQL manually rather than from a package, make
sure the server is started when the machine boots.


Add a User
==========

You need to add a new MySQL user for Bugzilla to use. Run the "mysql"
command-line client and enter:

   GRANT SELECT, INSERT,
   UPDATE, DELETE, INDEX, ALTER, CREATE, LOCK TABLES,
   CREATE TEMPORARY TABLES, DROP, REFERENCES ON bugs.*
   TO bugs@localhost IDENTIFIED BY '$DB_PASS';

   FLUSH PRIVILEGES;

You need to replace "$DB_PASS" with a strong password you have chosen.
Write that password down somewhere.

The above command permits an account called "bugs" to connect from the
local machine, "localhost". Modify the command to reflect your setup
if you will be connecting from another machine or as a different user.


Change Configuration
====================

To change MySQL's configuration, you need to edit your MySQL
configuration file, which is:

* Red Hat/Fedora: "/etc/my.cnf"

* Debian/Ubuntu: "/etc/mysql/my.cnf"

* Windows: "C:\mysql\bin\my.ini"

* Mac OS X: "/etc/my/cnf"


Allow Large Attachments and Many Comments
-----------------------------------------

By default on some systems, MySQL will only allow you to insert things
into the database that are smaller than 1MB.

Bugzilla attachments may be larger than this. Also, Bugzilla combines
all comments on a single bug into one field for full-text searching,
and the combination of all comments on a single bug could in some
cases be larger than 1MB.

We recommend that you allow at least 16MB packets by adding or
altering the "max_allowed_packet" parameter in your MySQL
configuration in the "[mysqld]" section, so that the number is at
least 16M, like this (note that it's "M", not "MB"):

   [mysqld]
   # Allow packets up to 16M
   max_allowed_packet=16M


Allow Small Words in Full-Text Indexes
--------------------------------------

By default, words must be at least four characters in length in order
to be indexed by MySQL's full-text indexes. This causes a lot of
Bugzilla-specific words to be missed, including "cc", "ftp" and "uri".

MySQL can be configured to index those words by setting the
"ft_min_word_len" param to the minimum size of the words to index.

   [mysqld]
   # Allow small words in full-text indexes
   ft_min_word_len=2


Permit Attachments Table to Grow Beyond 4GB
===========================================

This is optional configuration for Bugzillas which are expected to
become very large, and needs to be done after Bugzilla is fully
installed.

By default, MySQL will limit the size of a table to 4GB. This limit is
present even if the underlying filesystem has no such limit.  To set a
higher limit, run the "mysql" command-line client and enter the
following, replacing "$bugs_db" with your Bugzilla database name
(which is "bugs" by default):

   USE $bugs_db;

   ALTER TABLE attachments AVG_ROW_LENGTH=1000000, MAX_ROWS=20000;

The above command will change the limit to 20GB. MySQL will have to
make a temporary copy of your entire table to do this, so ideally you
should do this when your attachments table is still small.

Note: If you have set the setting in Bugzilla which allows large
  attachments to be stored on disk, the above change does not affect
  that.

======================================================================

This documentation undoubtedly has bugs; if you find some, please file
them here.
