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DBMS Questions et reponses d'entretien

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RDBMS vs Hadoop

Question 56. What is durability in DBMS?

Once the DBMS informs the user that a transaction has successfully completed, its effects should persist even if the system crashes before all its changes are reflected on disk. This property is called durability.

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Question 57. What do you mean by atomicity and aggregation?

1. Atomicity: Either all actions are carried out or none are. Users should not have to worry about the effect of incomplete transactions. DBMS ensures this by undoing the actions of incomplete transactions. 
2. Aggregation: A concept which is used to model a relationship between a collection of entities and relationships. It is used when we need to express a relationship among relationships.

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Question 58. What is a Phantom Deadlock?

In distributed deadlock detection, the delay in propagating local information might cause the deadlock detection algorithms to identify deadlocks that do not really exist. Such situations are called phantom deadlocks and they lead to unnecessary aborts.

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Question 59. What is a checkpoint and When does it occur?

A Checkpoint is like a snapshot of the DBMS state. By taking checkpoints, the DBMS can reduce the amount of work to be done during restart in the event of subsequent crashes.

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Question 60. Are the resulting relations of PRODUCT and JOIN operation the same?

No. 
PRODUCT: Concatenation of every row in one relation with every row in another. 
JOIN: Concatenation of rows from one relation and related rows from another.

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