# Overview A type of [[immutable]] log which can only have data written to the end of it. While this means old data is kept, it also makes it easy to find the latest version of data by simply searching up from the end of the log. # Key Considerations # Pros - Writing new data is a sequential write operation (i.e., next to each other on disk, as opposed to searching for write locations), which are generally faster than random writes - Simplifies concurrency and crash recovery # Cons - Not efficient for range look-ups, because data is not sorted # Use Cases - [[Hash Index]] # Related Topics