CAP Theorem
📘 DBMS
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📅 Nov 14, 2025
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CAP Theorem
CAP theorem states that a distributed system can guarantee at most two of the following three properties simultaneously: Consistency, Availability, and Partition tolerance.
Definitions
- Consistency: All nodes see the same data at the same time.
- Availability: Every request receives a response (not necessarily the latest data).
- Partition Tolerance: The system continues to operate despite arbitrary message loss between nodes.
Practical Implications
Systems choose trade-offs based on application needs. For example, some NoSQL systems favor availability and partition tolerance (AP), while traditional RDBMS favor consistency and availability (CA) within a single datacenter.
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