Lazy loading
- loads data into the cache only when necessary
- when application requests data, it first makes the request to the cache, if
cache hit, it is retrieved. - if it’s not or expired
cache miss, the the data is retrieved from the data store and then stored in the cache
Pros
- Only requested data is cached
Cons
cache miss penalty
Write through
- adds data or updates in the cache whenever data is written to the database
Pros
- the data in the cache is never stale
Cons
- the data or information that is stored in the cache is never used
- cost for space
- overhead due to the duplicate data
- cache churn