Which of the following is/are a key-value data store?试题 14选择一项或多项:a.CouchDBb.Hbasec.Voldemortd.Hypertablee.Dynamof.MongoDB
Question
Which of the following is/are a key-value data store?
试题 14选择一项或多项:
- a. CouchDB
- b. Hbase
- c. Voldemort
- d. Hypertable
- e. Dynamo
- f. MongoDB
Solution
To identify which options are key-value data stores, let's analyze each one:
-
CouchDB: Primarily a document store, but it does offer some key-value storage features. However, it is not classified strictly as a key-value store.
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HBase: A column-family NoSQL database that is built on top of HDFS (Hadoop Distributed File System). While it supports key-value storage, it is not solely a key-value store and instead is designed for wide-column data.
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Voldemort: A distributed key-value storage system. It is specifically designed to handle key-value pairs, making it a clear example of a key-value store.
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Hypertable: A database modeled after Google Bigtable, which can store data in key-value pairs but is also considered a column-family store.
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DynamoDB: A fully managed key-value and document database that offers high performance and scalability. It is a true key-value store.
-
MongoDB: Primarily a document database that stores data in flexible, JSON-like documents. While it has some key-value storage capabilities, it is not considered a key-value store.
Final Answer
The options that are key-value data stores are:
- b. HBase (partially, although it's not strictly a key-value store)
- c. Voldemort
- d. DynamoDB
Correct options based on strict definitions: c. Voldemort and d. DynamoDB.
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