Phase 1:Obtaining a Decision Coordinator asks all participants to prepare to commit transaction Ti. Ci adds the records <prepare 7>to the log and forces log to stable storage sends prepare T messages to all sites at which T executed Upon receiving message,transaction manager at site determines if it can commit the transaction if not,add a record <no T>to the log and send abort T message to Ci if the transaction can be committed,then: add the record <ready T>to the log force all records for T to stable storage send ready T message to C Database System Concepts-6th Edition 19.22 @Silberschatz,Korth and SudarshanDatabase System Concepts - 6 19.22 ©Silberschatz, Korth and Sudarshan th Edition Phase 1: Obtaining a Decision Coordinator asks all participants to prepare to commit transaction Ti . Ci adds the records <prepare T> to the log and forces log to stable storage sends prepare T messages to all sites at which T executed Upon receiving message, transaction manager at site determines if it can commit the transaction if not, add a record <no T> to the log and send abort T message to Ci if the transaction can be committed, then: add the record <ready T> to the log force all records for T to stable storage send ready T message to Ci