1.

Describe Two Phases Of Two-phase Commit ?

Answer»

Prepare phase - The global coordinator (initiating node) ask a PARTICIPANTS to prepare (to promise to commit or rollback the transaction, EVEN if there is a failure.
Commit Phase - If all participants respond to the coordinator that they are PREPARED, the coordinator asks all nodes to commit the transaction, if all participants cannot prepare, the coordinator asks all nodes to ROLL back the transaction.

Prepare phase - The global coordinator (initiating node) ask a participants to prepare (to promise to commit or rollback the transaction, even if there is a failure.
Commit Phase - If all participants respond to the coordinator that they are prepared, the coordinator asks all nodes to commit the transaction, if all participants cannot prepare, the coordinator asks all nodes to roll back the transaction.


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