Which of the following is/are correct?Question 4Select one or more:Select one or more:a.Some NoSQL databases let the programmer decide the trade-off between scalability and consistency.b.Different NoSQL databases may offer different levels of transaction supports.c.There are no transactions in any NoSQL databases.d.NoSQL databases define isolation levels under the BASE model .
Question
Which of the following is/are correct?Question 4Select one or more:Select one or more:a.Some NoSQL databases let the programmer decide the trade-off between scalability and consistency.b.Different NoSQL databases may offer different levels of transaction supports.c.There are no transactions in any NoSQL databases.d.NoSQL databases define isolation levels under the BASE model .
Solution
The correct options are:
a. Some NoSQL databases let the programmer decide the trade-off between scalability and consistency. b. Different NoSQL databases may offer different levels of transaction supports.
Explanation:
a. This is true because NoSQL databases like Cassandra allow the programmer to decide the trade-off between scalability and consistency. This is done by adjusting the consistency level of read and write operations.
b. This is also true because different NoSQL databases have different transaction support levels. For example, MongoDB supports multi-document transactions, while others like Cassandra only support single-document transactions.
c. This statement is false. While it's true that many NoSQL databases don't support transactions in the same way as SQL databases, some NoSQL databases, like MongoDB, do support transactions.
d. This statement
Similar Questions
Which of the following is/are correct?试题 10选择一项或多项：a.There are no transactions in any NoSQL databases.b.NoSQL databases define isolation levels under the BASE model .c.Different NoSQL databases may offer different levels of transaction supports.d.Some NoSQL databases let the programmer decide the trade-off between scalability and consistency.
Which of the following is/are correct?Question 6Select one or more:Select one or more:a.NoSQL databases often consider to scale out by using commodity hardware and free software.b.Scale up means to add more nodes to a system, e.g. adding more web servers.c.All NoSQL databases are scalable.d.Relational databases often cannot scale beyond certain point under ACID constraints.
Which of the following are characteristics of NoSQL databases? Select all that apply. 1 mark is deducted for each incorrect choice.Question 2Select one or more:A.Complex query supportB.Eventual consistencyC.ACID transactionsD.Strong consistencyE.Limited horizontal scalabilityF.Horizontal scalingG.Distributed computingH.High availabilityI.Schema-free designJ.Complex joins
True or False: NoSQL databases provide greater performance at the expense of availability.Question 4Select one:TrueFalse
What is/are the reason(s) for considering a NoSQL database, rather than a relational database?Question 8Select one or more:Select one or more:a.Complex transactions can be performed to preserve consistency across difference transactions.b.A database can allow the insertion of data without a pre-defined schema.c.High-performance queries are needed over a large amount of data, while update operations are rare.d.A declarative query language is preferred for querying data and managing data integrity.
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