IS411P Distributed Database Systems Quiz 2

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

To enforce atomicity and durability measures
To ensure that concurrent transactions see a consistent database state (correct)
To handle integrity enforcement for individual transactions
To optimize query processing and data replication

Which property do reliability measures enforce in distributed database systems?

Durability (correct)
Atomicity
Isolation
Consistency

What aspect of distributed database systems does data replication primarily address?

Distributed transaction processing
Concurrency control
Reliability and fault tolerance (correct)
Query processing and optimization

What is the main role of distributed DBMS reliability measures?

Ensure atomicity and durability of distributed transactions (A) Signup and view all the answers

In distributed database systems, what is the main function of distributed transaction processing?

Maintain consistency between concurrent transactions (C) Signup and view all the answers

What is the primary role of data replication in distributed database systems?

Providing fault tolerance and reliability (B) Signup and view all the answers

In timestamp-based concurrency control algorithms, how are serialization orders established?

By assigning each transaction a unique timestamp at initiation (C) Signup and view all the answers

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

Allowing each site to autonomously assign timestamps based on its local counter (B) Signup and view all the answers

What does a timestamp consist of in the context of a distributed DBMS?

A local counter value and a site identifier (D) Signup and view all the answers

What is the role of the coordinating TM in the basic TO algorithm?

Assigning timestamps to transactions and determining the sites where data items are stored (D) Signup and view all the answers

What is the TO Rule in the context of the basic TO algorithm?

It enforces a specific order of execution for conflicting operations (C) Signup and view all the answers

What happens if a new operation belongs to a transaction that is younger than all conflicting operations already scheduled in the basic TO algorithm?

The operation is accepted and executed immediately (D) Signup and view all the answers

What is the purpose of assigning read and write timestamps to data items in the basic TO algorithm?

To identify the oldest transaction that has read or written (updated) each data item (C) Signup and view all the answers

What is a potential drawback of the basic TO algorithm?

It causes excessive restarts of transactions due to no delaying (C) Signup and view all the answers

What is one of the key differences between basic TO and conservative TO algorithms?

Basic TO algorithm never causes operations to wait, whereas conservative TO algorithms introduce waiting times. (D) Signup and view all the answers

How do conservative TO algorithms attempt to lower system overhead?

By delaying each operation until there is no conflict with previously scheduled operations (C) Signup and view all the answers

Why does the conservative TO algorithm attempt to reduce transaction restarts?

To lower system overhead and reduce operational disruptions caused by restarts (C) Signup and view all the answers

What drawback does the conservative TO algorithm aim to mitigate compared to the basic TO algorithm?

The excessive restarts of transactions due to no delaying (D) Signup and view all the answers

What does the conservative TO algorithm prioritize over immediate acceptance of new operations?

Reduction of system resource utilization through delayed execution (A) Signup and view all the answers

What is a transaction in the context of a distributed database?

A transaction is a collection of actions that make consistent transformations of system states while preserving system consistency. Signup and view all the answers

What do concurrency control algorithms enforce in a distributed database system?

Concurrency control algorithms enforce the isolation property so that concurrent transactions see a consistent database state and leave the database in a consistent state. Signup and view all the answers

What property do reliability measures enforce in distributed database systems?

Reliability measures enforce atomicity and durability. Signup and view all the answers

What is the primary role of data replication in distributed database systems?

The primary role of data replication in distributed database systems is to enhance reliability and availability. Signup and view all the answers

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

The main function of distributed transaction processing is to coordinate transactions that access multiple distributed database nodes. Signup and view all the answers

What is the main purpose of web data management in the context of distributed database systems?

The main purpose of web data management is to manage and process large volumes of data generated from web applications and services. Signup and view all the answers

What is the primary purpose of timestamp-based concurrency control algorithms?

To establish a serialization order and execute transactions accordingly. Signup and view all the answers

How are timestamps assigned to transactions in a distributed DBMS?

Each site autonomously assigns timestamps based on its local counter, appending its own identifier to the counter value. Signup and view all the answers

What does the timestamp consist of in the context of a distributed DBMS?

The timestamp consists of a local counter value and a site identifier. Signup and view all the answers

What is the role of the coordinating Transaction Manager (TM) in the basic timestamp ordering (TO) algorithm?

The coordinating TM assigns timestamps to transactions, determines the storage sites of data items, and sends relevant operations to these sites. Signup and view all the answers

What is the TO Rule in the context of the basic TO algorithm?

According to the TO Rule, a conflicting operation Oij is executed before another conflicting operation Okl if and only if ts(Ti) < ts(Tk). Signup and view all the answers

What property does the basic TO algorithm guarantee in terms of deadlocks?

The basic TO algorithm never causes deadlocks. Signup and view all the answers

How does the basic TO algorithm handle conflicting operations?

The basic TO algorithm checks each new operation against conflicting ones and rejects it if the transaction is younger than all conflicting ones, causing a restart. Signup and view all the answers

What drawback is the conservative TO algorithm designed to mitigate compared to the basic TO algorithm?

The conservative TO algorithm aims to reduce the number of transaction restarts. Signup and view all the answers

How do conservative TO algorithms handle operations in contrast to the basic TO algorithm?

Conservative TO algorithms delay each operation instead of causing immediate restarts. Signup and view all the answers

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

The preferred method is for each site to autonomously assign timestamps based on its local counter, appending its own identifier to the counter value. Signup and view all the answers

Why does the conservative TO algorithm prioritize delaying operations?

The conservative TO algorithm aims to lower system overhead by reducing the number of transaction restarts. Signup and view all the answers

What drawback does the basic TO algorithm have in terms of transaction restarts?

The basic TO algorithm may potentially cause a transaction to restart numerous times. Signup and view all the answers

IS411P Distributed Database Systems Quiz 2

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Questions and Answers

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

Which property do reliability measures enforce in distributed database systems?

What aspect of distributed database systems does data replication primarily address?

What is the main role of distributed DBMS reliability measures?

In distributed database systems, what is the main function of distributed transaction processing?

What is the primary role of data replication in distributed database systems?

In timestamp-based concurrency control algorithms, how are serialization orders established?

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

What does a timestamp consist of in the context of a distributed DBMS?

What is the role of the coordinating TM in the basic TO algorithm?

What is the TO Rule in the context of the basic TO algorithm?

What happens if a new operation belongs to a transaction that is younger than all conflicting operations already scheduled in the basic TO algorithm?

What is the purpose of assigning read and write timestamps to data items in the basic TO algorithm?

What is a potential drawback of the basic TO algorithm?

What is one of the key differences between basic TO and conservative TO algorithms?

How do conservative TO algorithms attempt to lower system overhead?

Why does the conservative TO algorithm attempt to reduce transaction restarts?

What drawback does the conservative TO algorithm aim to mitigate compared to the basic TO algorithm?

What does the conservative TO algorithm prioritize over immediate acceptance of new operations?

What is a transaction in the context of a distributed database?

What do concurrency control algorithms enforce in a distributed database system?

What property do reliability measures enforce in distributed database systems?

What is the primary role of data replication in distributed database systems?

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

What is the main purpose of web data management in the context of distributed database systems?

What is the primary purpose of timestamp-based concurrency control algorithms?

How are timestamps assigned to transactions in a distributed DBMS?

What does the timestamp consist of in the context of a distributed DBMS?

What is the role of the coordinating Transaction Manager (TM) in the basic timestamp ordering (TO) algorithm?

What is the TO Rule in the context of the basic TO algorithm?

What property does the basic TO algorithm guarantee in terms of deadlocks?

How does the basic TO algorithm handle conflicting operations?

What drawback is the conservative TO algorithm designed to mitigate compared to the basic TO algorithm?

How do conservative TO algorithms handle operations in contrast to the basic TO algorithm?

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

Why does the conservative TO algorithm prioritize delaying operations?

What drawback does the basic TO algorithm have in terms of transaction restarts?

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