Deleting and dumping a database...

["Zachary K" <..hidden..>]

I recently screwed up in my accounting and tried deleting all of my invoiced to start over.  Well, after viewing my chart of accounts, I realized this didn't work, there are still values in the C of A.  So, I think deleting my database is the best option.  How do I do this?  Also, for future reference, how do I dump my database so I don't get this problem again?

Thanks,

Zach