Mainframe computers use polling to send or collect data with workstations. How does polling work, and what other more recently created protocols use polling??
What will be an ideal response?
Primary device sends a request to each secondary device in some order, asking each secondary device if it has something to submit to the primary device. Newer protocols that use polling include USB, FireWire, and Thunderbolt.?
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________ are software programs that extend the capabilities of a web browser
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Below is an excerpt from a system design document for an accident management system. It is a natural language description of the rationale for a relational database for permanent storage. Model this rationale with issues, proposals, arguments, criteria, and resolutions:
One fundamental issue in database design was database engine realization. The initial nonfunctional requirements on the database subsystem insisted on the use of an object- oriented database for the underlying engine. Other possible options included using a relational database, a file system, or a combination of the other options. An object- oriented database has the advantages of being able to handle complex data relationships and is fully buzzword compliant. On the other hand, OO databases may be too sluggish for large volumes of data or high- frequency accesses. Furthermore, existing products do not integrate well with CORBA, because that protocol does not support specific programming language features such as Java associations. Using a relational database offers a more robust engine with higher performance characteristics and a large pool of experience and tools to draw on. Furthermore, the relational data model integrates nicely with CORBA. On the downside, this model does not easily support complex data relationships. The third option was proposed to handle specific types of data that are written once and read infrequently. This type of data (including sensor readings and control outputs) has few relationships with little complexity and must be archived for extended periods of time. Files offer an easy archival solution and can handle large amounts of data. Conversely, any code would need to be written from scratch, including serialization of access. We decided to use only a relational database, based on the requirement to use CORBA and in light of the relative simplicity of the relationships between the system’s persistent data.