Data Mining and Data Warehouse MCQs with answers Page - 4

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Q. An operational system is _____________.

  • (A) used to run the business in real time and is based on historical data.
  • (B) used to run the business in real time and is based on current data.
  • (C) used to support decision making and is based on current data.
  • (D) used to support decision making and is based on historical data.

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Q. The generic two-level data warehouse architecture includes __________.

  • (A) at least one data mart.
  • (B) data that can extracted from numerous internal and external sources.
  • (C) near real-time updates.
  • (D) far real-time updates.

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Q. The active data warehouse architecture includes __________

  • (A) at least one data mart.
  • (B) data that can extracted from numerous internal and external sources.
  • (C) near real-time updates.
  • (D) all of the above.

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Q. Reconciled data is ___________.

  • (A) data stored in the various operational systems throughout the organization.
  • (B) current data intended to be the single source for all decision support systems.
  • (C) data stored in one operational system in the organization.
  • (D) data that has been selected and formatted for end-user support applications.

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Q. The extract process is ______.

  • (A) capturing all of the data contained in various operational systems.
  • (B) capturing a subset of the data contained in various operational systems.
  • (C) capturing all of the data contained in various decision support systems.
  • (D) capturing a subset of the data contained in various decision support systems.

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Q. Data scrubbing is _____________.

  • (A) a process to reject data from the data warehouse and to create the necessary indexes.
  • (B) a process to load the data in the data warehouse and to create the necessary indexes.
  • (C) a process to upgrade the quality of data after it is moved into a data warehouse.
  • (D) a process to upgrade the quality of data before it is moved into a data warehouse

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Q. The load and index is ______________.

  • (A) a process to reject data from the data warehouse and to create the necessary indexes.
  • (B) a process to load the data in the data warehouse and to create the necessary indexes.
  • (C) a process to upgrade the quality of data after it is moved into a data warehouse.
  • (D) a process to upgrade the quality of data before it is moved into a data warehouse.

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Q. Data transformation includes __________.

  • (A) a process to change data from a detailed level to a summary level.
  • (B) a process to change data from a summary level to a detailed level.
  • (C) joining data from one source into various sources of data.
  • (D) separating data from one source into various sources of data.

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Q. ____________ is called a multifield transformation.

  • (A) converting data from one field into multiple fields.
  • (B) converting data from fields into field.
  • (C) converting data from double fields into multiple fields.
  • (D) converting data from one field to one field.

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Q. The type of relationship in star schema is __________________.

  • (A) many-to-many.
  • (B) one-to-one.
  • (C) one-to-many.
  • (D) many-to-one.

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