Principles Of Distributed Database Systems Exercise Solutions Work ❲HIGH-QUALITY ✰❳

Orders ⋉ Customers’ = σ_CustID in (Paris CustIDs)(Orders). Assume each customer has 5 orders → 2500 orders remain.

The Coordinator sends a PREPARE message to all participants. P1cap P sub 1 P2cap P sub 2 reply with a VOTE_COMMIT message. P3cap P sub 3

Site A has the following fragment of R:

The Coordinator receives the message. Since 2PC requires unanimous agreement to commit, the coordinator decides to abort the global transaction.

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We compare the total byte size of both relations to find the smaller payload.

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