Showing posts with label Distributed Database. Show all posts
Showing posts with label Distributed Database. Show all posts

Tuesday, March 8, 2022

Distributed database solved MCQ - Who initiates 2PC protocol?

Multiple choices questions in Distributed database, two phase commit protocol solved MCQ, What is transaction coordinator, what is transaction manager? who initiates the 2PC protocol in distributed database?

Distributed database solved MCQ - Who initiates the execution of 2PC protocol in distributed transactions

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1. Who initiates the Two Phase Commit (2PC) protocol during the execution of distributed transaction?

a) Transaction manager

b) Transaction coordinator

c) Database administrator

d) All of the above

 

Answer: (b) Transaction coordinator

 

Execution of 2PC is initiated by the transaction coordinator after the last step of the transaction has been reached.

 

In distributed database environment, transactions may access several sites (servers). The distributed transactions make use of two components namely, transaction manager and transaction coordinator. Every site has both the transaction manager and transaction coordinator.

In distributed database environment, the transaction manager is just like the transaction manager in centralized DBMS. It does handle the concurrent execution of transactions executing locally at that site. Whereas the transaction coordinator coordinating the transactions that originate at that particular site. The responsibility of transaction coordinator includes, initiating the transaction that is requested at that site, coordinating the initiated transaction by distributing sub-transactions to other appropriate sites, and ensuring the safe execution of the transaction at all sites.

 

 



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Related links:

 

Distributed database multiple choice questions with answers

important quiz questions in DDB

one mark questions in distributed database for university examinations

What is the role of transaction manager in distributed database
What is the role of transaction coordinator in distributed database
Who is responsible for initiating the distributed concurrent transaction
Who initiates the concurrent execution of distributed transactions as per two phase commit protocol?
Transaction coordinator initiates the execution of concurrent distributed transactions
 

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