In the 2PL algorithm we considered, a transaction can't start until it has acquired all the locks it needs (we call this, Conservative 2PL). There is a different scheme possible, where a transaction does NOT need to wait for all its locks - it can start its transactions before all the locks have been acquired. What would be good about such a scheme, and, what would be bad? Do feel free to illustrate with a diagram.
In the 2PL algorithm we considered, a transaction can't start until it has acquired all the locks it needs (we call this, Conservative 2PL). There is a different scheme possible, where a transaction does NOT need to wait for all its locks - it can start its transactions before all the locks have been acquired. What would be good about such a scheme, and, what would be bad? Do feel free to illustrate with a diagram.
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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![In the 2PL algorithm we considered, a transaction can't start until it has acquired all the locks it needs
(we call this, Conservative 2PL).
There is a different scheme possible, where a transaction does NOT need to wait for all its locks - it
can start its transactions before all the locks have been acquired.
What would be good about such a scheme, and, what would be bad? Do feel free to illustrate with
a diagram.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F68787b99-8b7d-4434-9e06-0b12a6c74fb4%2F40df7976-12c7-49bb-b1ab-90075cf18d17%2Fpq78shm_processed.png&w=3840&q=75)
Transcribed Image Text:In the 2PL algorithm we considered, a transaction can't start until it has acquired all the locks it needs
(we call this, Conservative 2PL).
There is a different scheme possible, where a transaction does NOT need to wait for all its locks - it
can start its transactions before all the locks have been acquired.
What would be good about such a scheme, and, what would be bad? Do feel free to illustrate with
a diagram.
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