Architectural Patterns

Cache-aside pattern

The gist of this pattern is to load data on demand into a cache from a data store. This pattern can improve performance and also helps to maintain consistency between data held in the cache and the data in the data store. Applications use a cache to optimize repeated access to information held in a data store. However, it is usually impractical to expect that cached data will always be completely consistent with the data in the data store.

There are many commercial caching systems providing read-through and write-through/write-behind operations. In these systems, an application retrieves data by referencing the cache. If the data is not available in the cache, it is transparently retrieved from the distant data store and ...