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In _______________ index instead of storing all the columns for a record together, each column is stored separately with all other rows in an index.

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In _______________ index instead of storing all the columns for a record together, each column is stored separately with all other rows in an index. (a) Clustered (b) Column store (c) Non clustered (d) Row store The question was posed to me during a job interview. My question is taken from Index Definition in SQL topic in portion Indexing and Hashing of Database Management

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Correct option is (b) Column store To explain: A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes.

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