shawfactor

LH Mysql plugin allow you to create a complete database backup with single click. The entire contents of your databse can be downloaded in a compressed zip file which can also be emailed on an ongoing basis
FEATURES 
* A simple interface to download your database 
* A complete backup, including custom and non wordpress tables 
* The export file is zipped, massively reducing the size of the file downloaded or emailed 
* Ongoing backups by email on a weekly basis
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Example use:

LH Mysqldump

A simple plugin to export and backup your database, on an ongoing basis

Olar Marius

Justin Watt

Instead of needing a tool like <a href="http://www.phpmyadmin.net/home_page/index.php" rel="nofollow ugc">phpMyAdmin</a> 
or the mysql command line client to view and modify your WordPress database, 
the SQL Executioner allows you to run arbitrary SQL queries against your 
WordPress database from within the Admin. In many cases this allows you to bypass 
the inherent limitations of the WordPress Admin interface, and use the full expressive 
power of SQL to analyze and update your blog’s database.
To use simply install and visit the Tools > SQL Executioner page.
If you’re interested in contributing to the code behind this plugin, it’s also hosted on GitHub: 
https://github.com/justincwatt/wp-sql-executioner

SQL Executioner

This plugin seems to me simple but very useful.

Simple and efficient

I use this plugin on a daily basis to run quick queries in the database while developing. Very very helpful!!!

Amazing Tool

Execute arbitrary SQL queries against your WordPress database from the Admin.

LH Mysqldump vs SQL Executioner