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view source for two phase commit protocol wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in view source for two phase commit protocol add languages article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file page information get shortened url switch to legacy parser in other projects wikidata item appearance move to sidebar hide two phase commit protocol you do not have permission to edit this page for the following reason this ip address range has been globally blocked this does not affect your ability to read wikipedia pages most people who see this message have done nothing wrong some kinds of blocks restrict editing from specific service providers or telecom companies in response to recent abuse or vandalism and can sometimes affect other users who are unrelated to that abuse review the information below for assistance if you do not believe that you have done anything wrong this block affects editing on all wikimedia wikis the ip address or range 5 135 0 0 16 has been globally blocked by jon kolbert for the following reason s open proxy webhost visit the faq if you are affected this block will expire on 04 29 8 january 2027 your current ip address is 5 135 42 194 even while globally blocked you will usually still be able to edit pages on meta wiki if you believe you were blocked by mistake you can find additional information and instructions in the stewards block wizard other useful links global blocks help i have been blocked you can view and copy the source of this page basic algorithm commit request or voting phase the coordinator sends a query to commit message to all participants and waits until it has received a reply from all participants the participants execute the transaction up to the point where they will be asked to commit they each write an entry to their undo log and an entry to their redo log each participant replies with either an agreement message participant votes yes to commit if the participant s actions succeeded or an abort message participant votes no to commit if the participant experiences a failure that will make it impossible to commit commit or completion phase success if the coordinator received an agreement message from all participants during the commit request phase the coordinator sends a commit message to all the participants each participant completes the operation and releases all the locks and resources held during the transaction each participant sends an acknowledgement to the coordinator the coordinator completes the transaction when all acknowledgements have been received failure if any participant votes no during the commit request phase or the coordinator s timeout expires the coordinator sends a rollback message to all the participants each participant undoes the transaction using the undo log and releases the resources and locks held during the transaction each participant sends an acknowledgement to the coordinator the coordinator undoes the transaction when all acknowledgements have been received message flow pre coordinator participant query to commit vote yes no prepare abort commit abort commit rollback acknowledgement commit abort end pre an next to the record type means that the record is forced to stable storage ref name mohan1986 c mohan bruce lindsay and r obermarck 1986 http dl acm org citation cfm id 7266 transaction management in the r distributed database management system acm transactions on database systems tods volume 11 issue 4 dec 1986 pages 378 396 ref return to two phase commit protocol retrieved from https en wikipedia org wiki two phase_commit_protocol privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search view source for two phase commit protocol add languages add topic