Discussion
Which of the following is true concerning a global transaction?
Answer: B
Correct answer: The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary.
A transaction is global when it needs data from beyond its own site, and the distributed DBMS then decomposes it and routes the pieces to wherever the data lives. A local transaction is satisfied entirely at one site and needs no such routing - the distinction that decides how much coordination the transaction costs.
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