# Roundup

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# MySQL Backend

This notes detail the MySQL backend for the Roundup issue tracker.

## Prerequisites

To use MySQL as the backend for storing roundup data, you also need to install:

1. MySQL RDBMS 4.0.18 or higher - https://www.mysql.com/. Your MySQL installation MUST support InnoDB tables (or Berkeley DB (BDB) tables if you have no other choice). If you’re running < 4.0.18 (but not <4.0) then you’ll need to use BDB to pass all unit tests. Edit the `roundup/backends/back_mysql.py` file to enable DBD instead of InnoDB.
2. Python MySQL interface - http://sourceforge.net/projects/mysql-python

## Other Configuration

If you are indexing large documents (e.g attached file contents) using MySQL, you may need to increase the max_allowed_packet size. If you don’t you can see the error:

    'MySql Server has gone away (2006)'

To do this edit /etc/my.conf and change:

    [mysqld]
    max_allowed_packet = 1M

the ‘max_allowed_packet’ value from ‘1M’ to ‘64M’ or larger.

Alternatively you can install an alternate indexer (whoosh, xapian etc.) and force the tracker to use it by setting the `indexer` setting in the tracker’s `config.ini`.

This fix was supplied by telsch. See issue https://issues.roundup-tracker.org/issue2550743 for further info or if you are interested in developing a patch to roundup to help work around this issue.

## Running the MySQL tests

Roundup tests expect an empty MySQL database. Two alternate ways to provide this:

1. If you have root permissions on the MySQL server, you can create the necessary database entries using the follwing SQL sequence. Use `mysql` on the command line to enter:

       CREATE DATABASE rounduptest;
       USE rounduptest;
       GRANT ALL PRIVILEGES ON rounduptest.* TO rounduptest@localhost
            IDENTIFIED BY 'rounduptest';
       FLUSH PRIVILEGES;

2. If your administrator has provided you with database connection info, see the config values in ‘test/db_test_base.py’ about which database connection, name and user will be used.

The MySQL database should not contain any tables. Tests will not drop the database with existing data.

## Showing MySQL who’s boss

If things ever get to the point where that test database is totally hosed, just:

    $ su -
    # /etc/init.d/mysql stop
    # rm -rf /var/lib/mysql/rounduptest
    # /etc/init.d/mysql start

and all will be better (note that on some systems, `mysql` is spelt `mysqld`).

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