uncleflo
Registered since September 28th, 2017
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Distributed Transactions and Two-Phase Commit
Saved by uncleflo on January 27th, 2017.
The typical example of a transaction involves Alice and Bob, and their bank. Alice pays Bob $100, and the bank needs to debit Alice and credit Bob. Easy enough, provided the server doesn't crash. But what happens if the bank debits Alice, and then before crediting Bob, the server goes down? Or what if they credit Bob first, and then try to debit Alice only to find she doesn't have enough funds? A transaction allows the debit and credit operations to happen as a package ("atomically" is the word commonly used), so either both operations happen or neither happens, even if the server crashes halfway through the transaction. That way the bank never credits Bob without debiting Alice, or vice versa.
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