Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Q #35) Define Piggybacking?explain.
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- Note: Writes Program in jAva Language you will implement a distributed resource-management scheme using Akka actors. Generally speaking, resources are anything that a system may use to fulfill the tasks that its users ask of it. Disk drives are resources, as are printers and scanners; memory and cores can also be viewed as resources, as can database controllers and more exotic devices such as motion sensors, bar code readers, and webcams. In a distributed system, one often wants to share these resources with all nodes in the network.Conceptually, the system you will be building consists of a collection of computing nodes (think “machines on a network”) that can communicate via message passing. Each node owns a collection of local resources that it is willing to share with other nodes in the network. To manage this sharing, each node includes a Resource Manager, which is responsible for controlling access to the resources it owns. Users, which are also running on the system nodes,…arrow_forwardCooperating Processes: Select all of the following statements that are true. Ordinary (unnamed) pipes provide a solution for bidirectional communication between related processes. Mechanisms for inter-process communication enable different processes to exchange information and synchronize their actions. The bounded buffer solution to the producer-consumer problem, which was the first one discussed in class and does not use semaphores or monitors, allows at most BUFFERSIZE items in the buffer at the same time.arrow_forwardDo java object oriented full project source code Implement a project that will apply knowledge in JAVA object-oriented programming to manipulate records of information for a system. Apply array of objects or linked list of objects to store the records. The project shall consider the following requirements: 1. Demonstrate the following methods with records of objects: create and insert new object, remove existing object, search object, update object, and display object(s). 2. Be logical in the design of the solution – implement at least 3 classes including main() class, apply inheritance, create linked list of objects or array of objects, input validation. 3. Implement tasks to manipulate records in producing meaningful output – (e.g. apply searching and/or sorting to generate reports, perform calculation and others) *Use all knowledge (classes, objects, array of objects, exception handling, inputs, outputs, files) when developing the program. Topic: Student record system…arrow_forward
- Real-time Scheduling: Select all of the following statements that are true. Soft real-time systems must guarantee that real-time tasks will be serviced in accord with their deadline requirements. A periodic task is a job that is repeated regularly. A real-time task's CPU utilization can be calculated by dividing its period length by its service time for one period. Schedulability refers to a property indicating whether a real-time system (a set of real-time tasks) can meet its deadlines. Real-time systems apply an admission-control algorithm in order to decide whether a task is admitted (guaranteeing that it will complete on time) or rejected (if it cannot guarantee that the task will be serviced by its deadline).arrow_forwardShow a context-free grammar for each of the following languag Example 1: {a¹bm: m > n, m-n is even} Context-free grammar for the language: S -> aSb S -> Sbb S-> € Example 2: {albi: i, j≥0 and 2i = 3j + 1} Context-free grammar for the language: S->aaaSbb S -> aabarrow_forwardProgramming homework1) Simulated waiting queue in an Indian post office: In an Indian post office that not only distributes mail but also performs some financial activities like a savings bank, a lone postal worker attends to a single lineup of clients. As soon as a consumer enters the line, they are given a token # (serial number). After receiving assistance, the consumer exits the queue while the postal worker receives the token back. The employee could inquire as to how many consumers are still unattended at any one time.i) Put the system into practise using a suitable queue data structure, simulating the arrival and departure of consumers at random when the service is finished.arrow_forward
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