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Oracle Distributed Transactions Concepts MCQ

A system change number (SCN) is not an internal timestamp for a committed version of the database.

Answer

Correct Answer: False

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The database uses SCNs to coordinate distributed transactions among different databases. The database uses SCNs in which of the following ways?

Answer

Correct Answer: All

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Distributed transactions can become in-doubt in which of the following way?

Answer

Correct Answer: A server machine running Oracle Database software crashes

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Which of the following performs the following operations during a distributed transaction?


1) Sends all of the distributed transaction SQL statements, remote procedure calls, and so forth to the directly referenced nodes, thus forming the session tree.

2) Instructs all directly referenced nodes other than the commit point site to prepare the transaction.

3) Instructs the commit point site to initiate the global commit of the transaction if all nodes prepare successfully.


Answer

Correct Answer:

 Global coordinator


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When a node is told to prepare, it can respond in several ways, one of the ways is “no data on the node has been or can be modified, so no preparation is necessary”. This response is called as?

Answer

Correct Answer: Read-only

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Which of the following are supported by transaction control statements?

Answer

Correct Answer: Commit, Rollback, Savepoint

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If all statements of a transaction reference to only a single remote node, then the transaction is remote and it is not distributed.

Answer

Correct Answer: True

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Select the correct case for which only queries are issued at one or more nodes.

Answer

Correct Answer: Partially read-only

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Which condition is applied while determining the commit point site?

Answer

Correct Answer: If multiple nodes directly referenced by the global coordinator have the same commit point strength, then the database designates one of these as the commit point site

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In the session tree what is the role that has a node which is forced to reference data on other nodes to complete its part of the transaction.

Answer

Correct Answer: Local coordinator

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