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.
Question
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.
Solution
The correct statements are:
a. NoSQL databases often consider to scale out by using commodity hardware and free software. This is true because NoSQL databases are designed to expand horizontally. This means they can use cheaper, less powerful hardware to increase their capacity, rather than relying on expensive, high-end servers.
d. Relational databases often cannot scale beyond a certain point under ACID constraints. This is also true. ACID (Atomicity, Consistency, Isolation, Durability) is a set of properties that guarantee database transactions are processed reliably. However, these constraints can limit the scalability of relational databases.
The incorrect statements are:
b. Scale up means to add more nodes to a system, e.g. adding more web servers. This is false. The term for adding more nodes to a system is "scaling out". "Scaling up" refers to adding more power to an existing node, such as increasing CPU power, RAM, or storage.
c. All NoSQL databases are scalable. This is false. While NoSQL databases are generally more scalable than relational databases
Similar Questions
Which of the following is/are correct?试题 13选择一项或多项：a.Relational databases often cannot scale beyond certain point under ACID constraints.b.Scale up means to add more nodes to a system, e.g. adding more web servers.c.NoSQL databases often consider to scale out by using commodity hardware and free software.d.All NoSQL databases are scalable.
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What is the primary purpose of scaling out in NoSQL databases? Question 10Select one: To limit data access To reduce hardware costs To improve system response time To increase data complexity
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.
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