How buffering and caching techniques used by the recovery subsystem?

Buffering and caching techniques in the recovery subsystem: - In a subsystem. The recovery process is often closely inter twined with operating system functions. In general, one or more disk pages that include the data items to be updated are cached into main memory buffers and then updated in cache

Buffering and caching techniques is generally used to recover data when it is stored in database. Suppose change and update is needed in database it is first stored in logs and cached and buffered so that it do not create any duplicity and then it is used to recover any file or to fetch any data