Distributed Database Systems Quiz 2

What is the main purpose of concurrency control algorithms in a distributed database system?

Which aspect of reliability do reliability measures in a distributed database system primarily enforce?

What is the main function of distributed transaction processing in a distributed database system?

In a distributed database system, what does data replication primarily aim to achieve?

What is the primary role of web data management in a distributed database system?

What is the purpose of assigning unique timestamps to transactions in a distributed DBMS?

What is the preferred method for assigning timestamps in a distributed DBMS to maintain uniqueness?

What is the purpose of the basic timestamp ordering (TO) algorithm?

In the basic TO algorithm, when is a new operation accepted by the scheduler?

What distinguishes the conservative TO algorithm from the basic TO algorithm?

Concurrency Control Algorithms

Ensure that database transactions are executed in a correct and consistent manner, maintaining data integrity and consistency in a distributed database system.

Reliability Measures

Primarily enforce fault tolerance, ensuring that the system can recover from failures and continue to operate correctly.

Distributed Transaction Processing

Enables multiple operations to be executed as a single, all-or-nothing unit of work, ensuring consistency and reliability across the distributed system.

Data Replication

Aims to achieve high availability and improved system performance by maintaining multiple copies of data in different locations.

Web Data Management

Plays a crucial role in managing and integrating web-based data sources, enabling efficient and effective data retrieval and processing.

Assigning Unique Timestamps

Enables the ordering of transactions, ensuring that the correct sequence of operations is maintained, and preventing conflicts and inconsistencies.

Assigning Timestamps

The preferred method is to use a centralized timestamp generator, which ensures uniqueness and avoids conflicts.

Basic Timestamp Ordering (TO) Algorithm

Ensures that transactions are executed in a consistent and correct order, by assigning timestamps to transactions and ordering them based on these timestamps.

Basic TO Algorithm

A new operation is accepted by the scheduler if its timestamp is greater than the previous operation's timestamp.

Conservative TO Algorithm

Distinguishes from the basic TO algorithm by using a more conservative approach, where an operation is only accepted if its timestamp is greater than the previous operation's timestamp, and the operation does not conflict with any previously scheduled operations.

Test your knowledge of distributed database systems with this quiz covering topics such as introduction to distributed databases, database design, query processing, distributed transactions, concurrency control, reliability, data replication, big data processing, and web data management.