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Author Question: In a supertype/subtype hierarchy, attributes are assigned at the highest logical level that is ... (Read 420 times)

Mr.Thesaxman

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on: Jul 7, 2018
In a supertype/subtype hierarchy, attributes are assigned at the highest logical level that is possible in the hierarchy.
 
  Indicate whether the statement is true or false

Question 2

What is clustering?
 
  What will be an ideal response?
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efwsefaw

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Reply #1 on: Jul 7, 2018
Answer to Question 1

TRUE

Answer to Question 2

Clustering is a technique used in some database management systems (such as Oracle) to allow adjacent secondary memory space to contain rows from several tables. A cluster is defined by the tables used as well as the column or columns used for clustering. To create a cluster in Oracle, for example, we would create a cluster first with a create cluster command and then reference the cluster when we create each individual table.


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