Q6. Given below figure, answer the following questions a. What is the purpose of timej in steps 1 and 2? b. What is the purpose of Ni in step 3? c. These 7 steps represent 2 functionalities. What are they? d. Which type of keys is distributed by this technique? Key Distribution (1) Request Time, Authority (4) Request Timez (2) EgRaath (KUp | Request || Time , | (5) Ekrauth | A'U, Request |I Time, (3) Egt, IIDA "Nq} Initiator Responder A B (7) EKU, I N21-

Q6. Given below figure, answer the following questions a. What is the purpose of timej in steps 1 and 2? b. What is the purpose of Ni in step 3? c. These 7 steps represent 2 functionalities. What are they? d. Which type of keys is distributed by this technique? Key Distribution (1) Request Time, Authority (4) Request Timez (2) EgRaath (KUp | Request || Time , | (5) Ekrauth | A'U, Request |I Time, (3) Egt, IIDA "Nq} Initiator Responder A B (7) EKU, I N21-

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Suppose the deferred modification technique is used in a database. a. Is the old-value part of an update log record required any more? Why or why not? b. If old values are not stored in update log records, transaction undo. Is clearly not feasible. How would the redo-phase of recovery have to be modified as a result? C. Deferred modification can be implemented by keeping updated data items in local memory of transactions, and reading data items that have not been updated directly from the database buffer. Suggest how to efficiently implement a data item read, ensuring that a trans action sees its own updates.
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def furthest_apart_in_state(directorypath, state):"""given the directory where to find entity and region information and a state,return a tuple of the two entity IDs in that state that are furthest apart.If there is only one entity in the state, return None.If there are no entities in the state, return None.:param directorypath::param state::return: tuple of two entity IDs"""passFILE LOOKS LIKE THIS: ID,City,State,Latitude,LongitudeA45419E,Plattsburgh,NY,44.704021,-73.471148A19312D,Aiken,SC,33.554433,-81.69588A90172S,Tuscaloosa,AL,33.170238,-87.616169A19394D,Alexandria,VA,38.819853,-77.059645A27218D,Pittsburgh,PA,40.47441,-79.950968A68626D,Meadville,PA,41.611599,-80.114891A17494D,Allentown,PA,40.602658,-75.469236A86034S,Tonawanda,NY,42.99704,-78.878659A45142D,Asheville,NC,35.602711,-82.567281A38298S,Atlanta,GA,33.844371,-84.47405A14497Y,Roswell,GA,34.055198,-84.370475A25954D,Austin,TX,30.326374,-97.771258B46374X,Fairhope,AL,30.480713,-87.861306B52199S,Cedar…
One of its primary functions is key distribution, one of two primary issues it was created to address. Please provide a simple illustration of the key distribution process.
Suppose the deferred modification technique is used in a database. a. Is the old-value part of an update log record required any more? Why or why not? b. If old values are not stored in update log records, transaction undo. Is clearly not feasible. How would the redo-phase of recovery have to be modified as a result? C. Deferred modification can be implemented by keeping updated data items in local memory of transactions, and reading data items that have not been updated directly from the database buffer. Suggest how to efficiently implement a data item read, ensuring that a trans action sees its own updates.
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Do Scripts and stored procedures differ? What are the roles played by each of these? What are the benefits of using Stored Procedures over other methods?
Suppose the deferred modification technique is used in a database. a. Is the old-value part of an update log record required any more? Why or why not? b. If old values are not stored in update log records, transaction undo. Is clearly not feasible. How would the redo-phase of recovery have to be modified as a result? C. Deferred modification can be implemented by keeping updated data items in local memory of transactions, and reading data items that have not been updated directly from the database buffer. Suggest how to efficiently implement a data item read, ensuring that a trans action sees its own updates.
What are the requirements that must be met in order to avoid a deadlock?