Hi I am creating multi user script. I need your opinion as to whether I should merge all new user data into 1 database and allocate each entry by user_id example: Table: Books book_name, author, user_id -or- give each user their own database example: Table: clientsname_Books book_name, author The reason why I am asking for an opnion is because I am trying to work out the most secure approach to prevent SQL injections deleting the entire database, or making it harder for an attacker to delete everyone elses data? what do you think?