mohamad wael

Kt-cleanpress is a plugin designed to clean and optimize WordPress. It will give you the following options:
<ol>
<li>
Clean Posts: which will let you remove all posts marked as Trash / Pending / Draft with all their related contents from the database, and then it will defragment it.
</li>
<li>
Clean Pages: will do the same things described in Clean Posts, but it will process the pages.
</li>
<li>
Clean Comments: will do the same things described in Clean Posts, but it will process the Spam / Unapproved / Trash Comments.
</li>
<li>
Clean Post Revisions: Whenever a post is edited and saved WordPress automatically creates a backup to which one can revert. This option will remove all posts backups.
</li>
<li>
Clean Auto Draft: This is a left over from the process of creating a new WordPress page or post and not saving it as a draft of publishing it.
</li>
<li>
Clean Other Left Overs: Will remove navigation menus that are created but not saved, and all their related data, and will also remove unneeded lock and last entries in the database.
</li>
<li>
Clean Empty Categories / Tags: Will delete all categories/Tags that do not have any post or link associated with them but will not remove the default WordPress categories.
</li>
<li>
Optimize The Tables: Reclaim unused space and defragment the data file.
</li>
</ol>

KT-CleanPress

mikehealy

If you use the WordPress admin area on a mobile device, or have cats sometimes walk across your keyboard it can be good to have a fail-safe confirmation before permanently deleting posts from the Trashed items. 
This plugin adds simple JS to the admin area to do just that.

Trash Fail Safe

Require confirmation before deleting items from the Trash, or emptying the whole Trash. Protects against accidental clicks.

KT-CleanPress vs Trash Fail Safe