Is there any record of installed plugins in the database?

I have my live install on one server and a development install on another. I’ve added a plugin to both but it only appears in the plugin list in wp-admin on one.

For a plugin to appear in wp-admin does it need to appear in the database at all? Or is it that just by having the plugin file(s) in the plugins directory that it’ll be detected?

Cheers!

It saves the data in:

• wp_options
• • Row: option_name
• • • active_plugins