The following dependency graph shows the dependencies of four queries. Is a schedule from these queries conflict serializable? 83 81 84 82 O I don't have enough information to determine OYes O No Why is it important to have concurrency control in databases? Concurrency Control is needed so that multiple transactions can be executed at the same time. Concurrency Control is needed so that data can be updated correctly when multiple transactions are executed concurrently. Concurrency Control is needed to allow multiple users to edit the same record at the same time. Concurrency Control is needed so that the database can schedule conflicts based on the priority of the transactions.

The following dependency graph shows the dependencies of four queries. Is a schedule from these queries conflict serializable? 83 81 84 82 O I don't have enough information to determine OYes O No Why is it important to have concurrency control in databases? Concurrency Control is needed so that multiple transactions can be executed at the same time. Concurrency Control is needed so that data can be updated correctly when multiple transactions are executed concurrently. Concurrency Control is needed to allow multiple users to edit the same record at the same time. Concurrency Control is needed so that the database can schedule conflicts based on the priority of the transactions.

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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Assume a relation 'R' having 200 records. These records are stored in blocks having block factor as 20. Consider another relation 'S' having 120 records and all these records are stored in 30 blocks. These two tables have to be joined using nested loop join algorithm. At any instance main memory can hold exactly one block of R and one block of S. What are the total number of block access required to join R and S ?
1) Write algorithm for automatic acquisition of locks before start of any transaction. Also write in detailed the concept of lock conversion. 2) As a database administrator, we understand that there are different storage types. Analyze stable storage implementation which help to maintain consistency in any database recovery system PLEASE HELP
Transactions might take a long time to finish when an optimistic approach is taken to concurrency control. Explain?
a) transaction in DBMS b) concurrency contro in DBMS c) importance of concurrency control
Another action may be triggered by the execution of a trigger. There is often a limit on how deep nesting may go in database systems. Why could they impose such a restriction?
Another action may be triggered by the execution of a trigger. There is often a limit on how deep nesting may go in database systems. Why could they impose such a restriction?
When an optimistic approach to concurrency management is used, transactions often take a very lengthy time to complete. Explain.
A trigger's execution might result in the execution of another action. The depth of nesting in most database systems has a limit. Explain why they would put such a restriction in place.
Answer the following prompts 1The InstantRide Management team founded a new team for car maintenance. The new team is responsible for the small maintenance operations for the cars in the InstantRide system. The main idea is to take actions faster and minimize the time spent for the maintenance. Therefore, the Car Maintenance team wants to store MAINTENANCE_TYPE_ID (char(5)) and a MAINTENANCE_TYPE_DESCRIPTION (varchar(30)) in the database. Using MAINTENANCE_TYPE_ID as the PRIMARY KEY, create a new table, MAINTENANCE_TYPES, and send the table description with the column names and types to the Car Maintenance team. 2The Car Maintenance team also wants to store the actual maintenance operations in the database. The team wants to start with a table to store CAR_ID (CHAR(5)), MAINTENANCE_TYPE_ID (CHAR(5)) and MAINTENANCE_DUE (DATE) date for the operation. Create a new table named MAINTENANCES. The PRIMARY_KEY should be the combination of the three fields. The CAR_ID and MAINTENANCE_TYPE_ID…