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Distributed Database Systems Quiz 2 Solutions

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Distributed Database Systems Quiz 2 Solutions

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Questions and Answers

What is the main focus of Distributed Database Systems according to the provided curriculum?

Distributed transaction processing (correct)

Query Processing and optimization

Web Data Management

Data Replication

How is a transaction defined in the context of database systems?

A single operation performed on the database

A series of read-only operations

A group of unrelated actions performed on the system

A set of actions that transform system states consistently (correct)

What is the purpose of the Commit command in a transaction?

To roll back to the beginning of the transaction

To finalize and make permanent the updates made by the transaction (correct)

To undo all the changes made by the transaction

To abort the transaction

What does Transaction management primarily deal with?

Keeping the database in a consistent state during concurrent accesses and failures Signup and view all the answers

Which topic is NOT included in the main curriculum of Distributed Database Systems according to the provided information?

Data Encryption Signup and view all the answers

What action marks the end of a transaction in database systems?

Commit or Abort command Signup and view all the answers

Which property of a transaction ensures that all its writes are committed and persist even after a system failure?

Durability Signup and view all the answers

What constitutes the base set (BS) of a transaction?

The union of its read set and write set Signup and view all the answers

Which degree of consistency ensures that a transaction does not read dirty data from other transactions?

Degree 2 Signup and view all the answers

At which isolation level are fuzzy reads and phantoms possible, but dirty reads are not?

Read Committed Signup and view all the answers

What is the main role of concurrency control algorithms in transaction processing?

Enforce isolation Signup and view all the answers

What does a resilient system tolerate in the context of database management?

System failures Signup and view all the answers

What is the purpose of database consistency?

To maintain a consistent state of the database Signup and view all the answers

What do the read set and write set of a transaction constitute together?

The union of sets Signup and view all the answers

Which isolation level allows for only phantoms, but no fuzzy or dirty reads?

Repeatable Read Signup and view all the answers

What is the primary feature of Degree 3 consistency for transactions?

Not reading dirty data from other transactions Signup and view all the answers