Sequential I/O
Sequential I/O is a data access pattern where data is read from or written to a storage medium in a linear, ordered sequence, typically from start to end without random jumps. It is commonly used in scenarios like streaming media, log file processing, and batch data transfers, where data is accessed in the order it is stored. This contrasts with random I/O, which involves accessing data at arbitrary locations, and is often more efficient for sequential operations due to reduced seek times and better cache utilization.
Developers should learn and use sequential I/O when dealing with large datasets that are processed in order, such as reading log files, streaming video or audio, or performing bulk data imports/exports. It is crucial for optimizing performance in applications like database backups, data pipelines, and media servers, as it minimizes disk head movement and leverages prefetching mechanisms. Understanding this concept helps in designing efficient storage systems and choosing appropriate file formats or databases that support sequential access patterns.