[Koha] How to clean entire catalogue ?

Dear Friends, How to clean the entire biblio (records) from database ? My purpose is to import the fresh marc file after ckeaning the entire catalogue details. Regards, -- Vimal Kumar V. Asst. Librarian Asian School of Business Technopark, Trivandrum-695 581 Web: http://www.vimalkumar.co.nr Blog: http://vimalkumar.oksociety.in OK Society Volunteer. http://oksociety.in --------------------------------------------------------------------------- "I forget what I was taught. I only remember what I have learnt" -Patrick White