Why does Cloud Spanner use the TrueTime API for global distribution instead of relying on traditional clocks?

hard📝 Conceptual Q10 of 15

GCP - Cloud SQL and Databases

ATrueTime provides bounded time uncertainty to ensure external consistency

BTraditional clocks are faster but less secure

CTrueTime is cheaper to operate than traditional clocks

DTraditional clocks cannot synchronize data at all

Step-by-Step Solution

Solution:

Step 1: Understand TrueTime's role
TrueTime gives a global clock with a known uncertainty bound to coordinate transactions.
Step 2: Compare with traditional clocks
Traditional clocks lack bounded uncertainty, risking inconsistent data ordering.
Final Answer:
TrueTime provides bounded time uncertainty to ensure external consistency -> Option A
Quick Check:
TrueTime ensures consistency with bounded uncertainty [OK]

Quick Trick: TrueTime ensures consistent global ordering with time bounds [OK]

Common Mistakes:

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