Transactional Workflows Workflows are activities that involve the coordinated execution of multiple tasks performed by different processing entities. With the growth of networks,and the existence of multiple autonomous database systems,workflows provide a convenient way of carrying out tasks that involve multiple systems. Example of a workflow delivery of an email message,which goes through several mails systems to reach destination. Each mailer performs a tasks:forwarding of the mail to the next mailer. If a mailer cannot deliver mail,failure must be handled semantically (delivery failure message). Workflows usually involve humans:e.g.loan processing,or purchase order processing. Database System Concepts-6th Edition 26.11 ©Silberschat乜，Korth and SudarshanDatabase System Concepts - 6 26.11 ©Silberschatz, Korth and Sudarshan th Edition Transactional Workflows Workflows are activities that involve the coordinated execution of multiple tasks performed by different processing entities. With the growth of networks, and the existence of multiple autonomous database systems, workflows provide a convenient way of carrying out tasks that involve multiple systems. Example of a workflow delivery of an email message, which goes through several mails systems to reach destination. Each mailer performs a tasks: forwarding of the mail to the next mailer. If a mailer cannot deliver mail, failure must be handled semantically (delivery failure message). Workflows usually involve humans: e.g. loan processing, or purchase order processing