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Excalidraw Data

Text Elements

Client 1

client 2

cache

database

a=1

a=2

a=1

data a is consistent between cache and database

delete a

read a, cache miss

read a=1

set a=1 to cache

set a=2

delete cache first

delete cache later

read a, cache miss

read a=1

update a=2

delete

set a=1

selected solution: read aside + write around

write cache first

write to cache operation is very fast