Cache invalidation is a computer process that renders cached data invalid. This removes the content and will no longer be displayed upon request. The aim is to serve the user with the newest content version when they request.

Cache invalidation can also help optimize websites, reduce loading time, and use fewer servers. It can be performed independently or included in the coherence protocol.

Cache invalidation Methods

How Does Cache Invalidation Work?

Website caching can lead to outdated information if the cache isn’t refreshed. Cache invalidation ensures cache reflects the latest data from the server. Invalidation involves syncing data across system layers, which requires careful coordination. If a change is made on one layer, it should be propagated to other layers to maintain system consistency.

An invalid result appears in the cache if one input changes. Moreover, the software may continue working, making it difficult to identify the problem to solve the cache invalidation logic.

Generally, a cache retains frequently accessed data, making it easy and quicker to retrieve it and reducing the strain on the original storage. Usually, applications check the cache first for data; if not found, they fetch it from primary storage. The newly obtained data is stored in the cache for faster retrieval in the future.

Various factors can influence cache invalidation. For example, cookies can be used to manage cache invalidation by linking specific cache entries with user-specific data.

Benefits of Cache Invalidation

Strategies for Cache Invalidation