Select one or more: O a. Dynamo uses consistent hashing to achieve consistency O
ID: 3601801 • Letter: S
Question
Select one or more: O a. Dynamo uses consistent hashing to achieve consistency O b. The advantage of consistent hashing is that changes of a node only affects its immediate neighbors and other nodes remain unaffected. O c. A virtual node looks like a single node, and each storage host must be responsible for exactly one virtual node d. In consistent hashing, the output range of a hash function is treated as a "ring". Which of the following about the CAP Theorem is/are correct? Select one or more: O a. C stands for "Consistency" b. The CAP theorem states that, every distributed database system can only be guaranteed to have at most two out of the three properties represented by C, A, and P simultaneously. c. P stands for "Partition tolerance" d. It is possible to have the three properties represented by C, A, and P for a non-distributed database system simultaneously. e. A stands for "Atomicity" Which of the following are correct? Select one or more: O a. Eventual consistency guarantees that, if updates are made to a given data item, all reads to that item will eventually return the same value b. Eventual consistency does not order concurrent writes as they are executed. O c. Under eventual consistency, all servers eventually "converge" to the same state at some point in future. O d. Eventual consistency ensures that data is eventually consistent in a distributed database system. Thus, no any read-write conflicts and write-write conflicts can occur under eventual consistency.Explanation / Answer
1.a,b,c options are correct
Explanation:
CAP acronym is onsistency. Availability. Partition tolerance.
CAP is frequently misunderstood as if one had to choose to abandon one of the three guarantees at all times.
2. b&c are correct
Explanation:
a) wrong : Eventual consistency is a consistency model used in distributed computing to achieve high availability that informally guarantees that, if no new updates are made to a given data item, eventually allaccesses to that item will return the last updated value
b )correct:eventual consistency does not require anyordering between writes as Eventual consistency does not say anything about the ordering of operations
c) correct: Eventual consistency means all servers eventuallyconverge to the same state, the system can return any data and still be eventually consistent as it might "converge" at some later point. The only guarantee is that, at some point in the future
d)wrong:
3. b,d are correct options
Explanation: as BASE requires these properties : Basically Available, Soft-State, Eventually Consistent
4.a,b,c are correct
a) correct :Dynamo targets applications that operate with weaker consistency if this results in high availability
b)correct:Dynamo provides a simple primarykeyonly interface relies on simple read and write operations to a data item that is uniquely identified by a key
c)wrong:Dynamo does not provide any isolation guarantees and permits only single key, Dynamo did not offerauthentication and authorization
d)correct:Dynamo is incrementally scalable and allows service owners to scale up and down based on their current request load.
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