We need transactions management for system effectiveness.

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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Question 1: True or False
Question
Answer
We need transactions management for system effectiveness.
In an E/R diagram, the relations cannot have their own keys.
In a database system, we use write-ahead logging to achieve concurrency.
We should avoid interleaving transactions.
A schedule with Write-Write conflicts cannot be converted to a serial
schedule.
In strict 2PL, the program cannot access to the data when there is a lock on
it.
We prefer RAM than Disk since it is durable.
The external merge sort algorithm can be complete with as little as two
buffer pages.
Transcribed Image Text:Question 1: True or False Question Answer We need transactions management for system effectiveness. In an E/R diagram, the relations cannot have their own keys. In a database system, we use write-ahead logging to achieve concurrency. We should avoid interleaving transactions. A schedule with Write-Write conflicts cannot be converted to a serial schedule. In strict 2PL, the program cannot access to the data when there is a lock on it. We prefer RAM than Disk since it is durable. The external merge sort algorithm can be complete with as little as two buffer pages.
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