Reports on the size and structure of your database. Shows where your data is distributed among your database tables.
Note: This plugin is somewhat geared towards developers.
See the FAQ for more info.
Some screenshots can be found here for the time being: https://github.com/j-masci/wp-db-analyzer
Feel free to suggest or add anything that you might find useful:
https://github.com/j-masci/wp-db-analyzer