
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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- Design a relational database schema from the Car Sharing IS domain class diagram. Output should look like image number 2arrow_forwardSometimes a transaction has to be undone after it has committed because it was erroneously executed—for example, because of erroneous input by a bank teller. a. Give an example to show that using the normal transaction undo mechanism to undo such a transaction could lead to an inconsistent state. b. One way to handle this situation is to bring the whole database to a state prior to the commit of the erroneous transaction (called point-in-time recovery). Transactions that committed later have their effects rolled back with this scheme. Suggest a modification to the recovery algorithm of Section 19.4 to implement point-in-time recovery using database dumps. c. Later nonerroneous transactions can be reexecuted logically, if the updates are available in the form of SQL but cannot be reexecuted using their log records. Why?arrow_forwardLet's look at an airline database to see how snapshot isolation is used in practice. The airline, for instance, could agree to a nonserializable execution if it means better long-term outcomes.arrow_forward
- Think of a database for an airline as an example. A non-serializable approach could be acceptable if airlines can achieve higher overall performance.arrow_forwardConsider a database for an airline that employs "snapshot isolation" as an example. Non-serializable executions may be acceptable if the overall performance of the airline is improved.arrow_forwardDistributed database systems, like other distributed systems, have an issue with concurrency management, which is similar to the problem that other distributed systems have. Considering that pieces are not duplicated, is it required to impose concurrency management methods such as 2PL (Two-phase locking) on a system? Explain.arrow_forward
- Start with a database transaction. We'll look on the bright side when we meet again.arrow_forwardConsider a database with tables with parent tables and tables without parent tables. What differentiates controllers used to manage data for tables with and without parent tables?a) The routing algorithm to the controllerb) The number of methods in the controllerc) The controller method parameters, redirections, and model manipulationsd) Views are called from the models instead.arrow_forwardConsider starting with a database that an airline uses that implements "snapshot isolation" as an initial data set for this illustration. What if a non-serializable execution improved the airline's performance in the aggregate instead of increasing it?arrow_forward
- Take, for example, a snapshot-isolated database management system like the one employed by an airline. I was wondering if you could provide me an example of a non-serializable execution that the airline is willing to endure in exchange for greater speed.arrow_forwardConsider a basic database that stores information about students' grades. Create a database and offer a SQL query that returns a list of honour roll students (top 10%), ordered by grade point average.arrow_forwardHow do concepts like ACID (Atomicity, Consistency, Isolation, Durability) and BASE (Basically Available, Soft state, Eventually consistent) differ in their application to database environments, especially in distributed systems?arrow_forward
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