[Solved] Which of these best describes how an event store handles data updates? — Ans: It appends new events representing changes | Microservices

Microservices - Event-Driven Architecture

Which of these best describes how an event store handles data updates?

AIt overwrites the previous data with new state

BIt appends new events representing changes

CIt deletes old data and inserts new data

DIt stores data in a key-value cache

Step-by-Step Solution

Solution:

Step 1: Recall event store update method
Event stores append new events instead of overwriting data.
Step 2: Eliminate incorrect options
Options A, B, and C describe other storage methods, not event stores.
Final Answer:
It appends new events representing changes -> Option B
Quick Check:
Event store updates = Append events [OK]

Quick Trick: Event stores append events; they never overwrite [OK]

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Which of these best describes how an event store handles data updates?