Yes, it’s a default table. Here’s the full list:
http://codex.wordpress.org/Database_Description
Thanks snowman this is a part of my db. It appears _aioseop_title is added by my SEO plugin. I have deleted all my posts. Is it safe to delete all the entries in this table? Thanks
37 14 _aioseop_title post test
36 14 _aioseop_description post test
26 14 _pingme 1
27 14 _encloseme 1
35 14 _aioseop_keywords post test
34 14 _wp_old_slug
38 18 _edit_last 1
39 18 _edit_lock 1287516182
40 18 _pingme 1
41 18 _encloseme 1
42 18 _wp_old_slug
Sorry, I’ve got no idea what tables or entries the plugin creates when you install it.
I would imagine all the entries in the database would be removed when you uninstall the plugin.