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

Fabricio Carella

This plugin will allow you to execute any type of SQL query into the WordPress’s DB connecting through the driver provided by the MySQLi extension without the need to use another tool like phpMyAdmin.
It also gives you the ability to export the results in a CSV format file.
In order to access this plugin’s admin page (Tools -> Run SQL Query), your account needs to have the <code>install_plugins</code> capability, that means a Super Admin in the multi-site installation or an Admin in a single site.
Feel free to contribute: 
https://github.com/Sefirost/run-sql-query
Use on you own risk. Under no circumstances will the Author of this plugin assume responsibility or liability for any damages or destructive effects on the database resulting from the queries executed using this tool.

Run SQL Query

Run SQL Query is a simple plugin to quickly execute any type of SQL query into the WordPress's DB and export the results in a CSV format file.

LH Mysqldump vs Run SQL Query