ondievälimuisti

Ondievälimuisti is a Finnish term that translates to "on-demand cache" or "deferred cache" in English. It refers to a caching strategy where data is not immediately stored in the cache upon its initial retrieval or generation. Instead, the caching process is delayed until the data is actually requested or needed by the application. This approach aims to optimize resource usage by avoiding the storage of data that might never be accessed again.

The core principle of ondievälimuisti is to defer the caching decision. When data is requested, the system first checks if it's available in the cache. If not, it retrieves or generates the data. Only at this point, or upon subsequent requests, is the data considered for caching. This contrasts with traditional caching where data might be preemptively stored as soon as it's produced.

This strategy is particularly beneficial in scenarios with a large volume of transient data or when the probability of re-accessing certain data is low. By not caching everything upfront, ondievälimuisti can reduce memory consumption and potentially improve the performance of write operations, as fewer items are immediately written to the cache. However, it can also lead to slightly increased latency for the first access to a piece of data that is subsequently cached, as the retrieval and caching steps occur together. The implementation details vary depending on the specific caching system or framework being used.