Distributed Database Systems Curriculum Quiz

Play an AI-generated podcast conversation about this lesson

What is the main benefit of locating data closer to their access points in a distributed database system?

Simplified query processing

Reduction in response time (correct)

Improved system reliability

Enhanced data security

What does the term 'logical data item' refer to in the execution model of replicated databases?

The synchronization process of the data copies

The process of data replication

The actual physical copy of the data

The original data item being replicated (correct)

Which factor dictates the maintenance of multiple data copies as part of their operational specifications in distributed databases?

System availability

Data replication challenges

Scalability concerns

Application requirements (correct)

What is one of the challenges posed by data replication in distributed databases?

Synchronization of different copies Signup and view all the answers

In the context of distributed databases, what is the purpose of data replication for scalability?

To support growth with acceptable response times Signup and view all the answers

What is the responsibility of the replica control protocol?

Mapping logical data item operations to physical data items Signup and view all the answers

In a partially replicated database, what type of transactions are considered local transactions?

Transactions that access only non-replicated data items Signup and view all the answers

What does a mutually consistent state in a replicated database ensure?

All replicas of each data item have identical values Signup and view all the answers

What is the characteristic of centralized update techniques?

They perform updates first on a master copy Signup and view all the answers

What is the primary responsibility of the replica control protocol in a replicated database system?

Mapping user transactions' read and write operations to physical data items Signup and view all the answers

What type of transactions have to be executed at multiple sites in a partially replicated database?

Global transactions that access replicated data items Signup and view all the answers

When are updates performed on a replica considered centralized?

When they perform updates first on a master copy Signup and view all the answers

What characterizes a distributed update technique?

Allowing updates over any replica Signup and view all the answers

The effect of transactions performed by clients on replicated objects should be the same as if they had been performed on a single set of objects. This statement refers to:

One-copy equivalence (single system image) Signup and view all the answers

What does reliability refer to in the context of distributed database systems?

The probability that the system has not experienced any failures within a given time period. Signup and view all the answers

What is the main problem related to reliability in maintaining atomicity and durability properties of transactions in distributed database systems?

Distributed Concurrency Control Signup and view all the answers

What type of transactions are considered local transactions in a partially replicated database?

Read-only transactions Signup and view all the answers

What is the primary purpose of data replication in distributed databases?

To achieve high availability Signup and view all the answers

What does availability refer to in the context of distributed database systems?

The probability that the system is operational according to its specification at a given point in time. Signup and view all the answers

Which factor dictates the maintenance of multiple data copies as part of their operational specifications in distributed databases?

Distributed DBMS Reliability Signup and view all the answers

What is the expected time between subsequent failures in a system with repair?

Mean time between failures (MTBF) Signup and view all the answers

What is the expected time to repair a failed system known as?

Mean time to repair (MTTR) Signup and view all the answers

What kind of failures can lead to total failure or partial failure in a distributed DBMS?

Site (system) failures Signup and view all the answers

What does the local recovery manager (LRM) relate to in the execution of commands?

Buffer manager Signup and view all the answers

When does the buffer manager read a page of data into an empty database buffer?

When executing a fetch command Signup and view all the answers

What type of update causes a change in one or more data values on pages in the database buffers?

In-place update Signup and view all the answers

What strategy dictates when to write log records into stable store?

Write–Ahead Log Protocol Signup and view all the answers

Can the buffer manager decide to write some of the buffer pages being accessed by a transaction into stable storage?

Yes, depending on LRM's instruction Signup and view all the answers

What decision does the LRM force the buffer manager to make at the end of a transaction's execution?

Flush/no-flush decision Signup and view all the answers

What kind of redo/undo does No-Fix/No-Flush strategy involve?

No-Fix/No-Flush redo / undo Signup and view all the answers

Distributed Database Systems Curriculum Quiz

Choose a study mode

Podcast

Questions and Answers

What is the main benefit of locating data closer to their access points in a distributed database system?

What does the term 'logical data item' refer to in the execution model of replicated databases?

Which factor dictates the maintenance of multiple data copies as part of their operational specifications in distributed databases?

What is one of the challenges posed by data replication in distributed databases?

In the context of distributed databases, what is the purpose of data replication for scalability?

What is the responsibility of the replica control protocol?

In a partially replicated database, what type of transactions are considered local transactions?

What does a mutually consistent state in a replicated database ensure?

What is the characteristic of centralized update techniques?

What is the primary responsibility of the replica control protocol in a replicated database system?

What type of transactions have to be executed at multiple sites in a partially replicated database?

When are updates performed on a replica considered centralized?

What characterizes a distributed update technique?

The effect of transactions performed by clients on replicated objects should be the same as if they had been performed on a single set of objects. This statement refers to:

What does reliability refer to in the context of distributed database systems?

What is the main problem related to reliability in maintaining atomicity and durability properties of transactions in distributed database systems?

What type of transactions are considered local transactions in a partially replicated database?

What is the primary purpose of data replication in distributed databases?

What does availability refer to in the context of distributed database systems?

Which factor dictates the maintenance of multiple data copies as part of their operational specifications in distributed databases?

What is the expected time between subsequent failures in a system with repair?

What is the expected time to repair a failed system known as?

What kind of failures can lead to total failure or partial failure in a distributed DBMS?

What does the local recovery manager (LRM) relate to in the execution of commands?

When does the buffer manager read a page of data into an empty database buffer?

What type of update causes a change in one or more data values on pages in the database buffers?

What strategy dictates when to write log records into stable store?

Can the buffer manager decide to write some of the buffer pages being accessed by a transaction into stable storage?

What decision does the LRM force the buffer manager to make at the end of a transaction's execution?

What kind of redo/undo does No-Fix/No-Flush strategy involve?

More Like This

Distributed Databases Quiz

IS411P Distributed Database Systems Quiz 2

Distributed Databases Design Fundamentals

Distributed Databases Systems - Part II Quiz

Upgrade to continue