What are the advantages and disadvantages of financial transactions?

The advantage is that usually transaction processing is really fast, it takes up usually a few seconds, however, if there a lot of files in queue, the time taken to process data might take a long time. Another advantage is that it makes the process of boking more fair as files are processed in order in which they had been queued. (e.g. ticket booking)

The disadvatages is that there is a chance of double booking. Also, transaction processing systems need to use direct acess files, serial acess media such as magnetic tape cannot be used.