WordPress is one of the widely used blogging platform. We have already talked about how important it is to lower down your wordpress plugin , to keep your wordpress fast.
There is one thing very important to understand, when we disable or uninstall any plugin, it is not complete un-installation. The table and data of that plugin is still under your wordpress database. One easy way to get rid of it by manually accessing your wordpress php myadmin, and delete all the table created by wordpress plugin.
Though many users are not familiar with this method. WP-DB manager wordpress plugin is one such plugin, which will help you to optimize your wordpress database and delete all unused tables. More over it also helps you to take your wordpress database backup.
Probably this is one plugin which provide all the functionality for your database and also run SQL query from database.
Specially if you are on shared hosting and your hosting company is asking you to lower down the load or if you are facing slow wordpress issue.
The above screenshot shows the database optimization. You should prefer optimizing your database once in a week.
This screen shows two options in which you an empty or delete a table. If you see any table for plugin which you are not using any more, select the drop option.
Try this option only if you are aware of what you are doing. Else ask any expert to do it for you.
IMHO this is one must have wordpress plugin.