Shared Database Many problems with file integration are mitigated when using a shared database. All applications have access to the same data, often via parent language like SQL. In addition, it is easy to notify applications when changes occur, as triggers are often part of modern databases. However, there are two major drawbacks. First, it is always necessary to design a common data scheme that is far from trivial if all the applications that need to be integrated are not fully known in advance. Second, when there are a lot of readings and updates, a shared database can easily become a power shortage. Exception If the cache is filled, what data should be deleted to store the recovered pages? Cluster computing systems have become increasingly popular as the value for money of PCs and workstations has improved. At one point, it became financially and technically attractive to build a supercomputer with standard technology, simply by connecting a collection of relatively simple computers to a high-speed network. In virtually all cases, cluster computing is used for parallel programming, where a single (computational-intensive) program is run in parallel on multiple computers.
By zooming in on a single node, we see that they are not conceptually very different from “normal” computers: above the hardware, there is a layer of software that corresponds to what traditional operating systems offer, including low-level network access, access to sensors and principals, memory management, etc. Generally, support is included for certain services, such as. B as location, local memory (think of additional flash devices) and convenient communication devices such as messaging and routing. However, as with other connected computer systems, additional support is needed to effectively deliver sensor network applications. In distributed systems, this takes the form of middleware. For sensor networks, it is best to look at the middleware software that is provided and has been thoroughly reviewed by Mottola and Picco . Software-as-a-Service (SaaS), which covers their applications, as Blair and Stefani point out , comprehensiveness and neutrality are important for interoperability and portability.