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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
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Solution

To identify which options are key-value data stores, let's analyze each one:

  1. 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.

  2. 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.

  3. 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.

  4. Hypertable: A database modeled after Google Bigtable, which can store data in key-value pairs but is also considered a column-family store.

  5. DynamoDB: A fully managed key-value and document database that offers high performance and scalability. It is a true key-value store.

  6. 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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