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Learn how Google Cloud Spanner’s TrueTime uses GPS‑aided atomic clocks to represent time as an interval, enabling external consistency via the commit wait rule while avoiding a centralized timestamp oracle.
TrueTime gives Google Spanner global external consistency by returning a bounded time interval and enforcing a commit‑wait rule, eliminating a central timestamp oracle and keeping latency predictable.
Google Spanner's TrueTime API achieves external consistency by representing time as an interval and enforcing a commit wait. This blog explains the mechanism, shows a cross-region transaction example, and quantifies the latency trade-offs.
Distributed clocks drift, leading to data inconsistency. Discover how Google Spanner uses TrueTime and 'commit wait' to achieve global external consistency.
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