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Author Question: A(n) ________ is one or more columns of a relation that is used to identify a row. Fill in the ... (Read 17 times)

saliriagwu

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on: Jul 7, 2018
A(n) ________ is one or more columns of a relation that is used to identify a row.
 
  Fill in the blank(s) with correct word

Question 2

Which of the following is true about a shared lock?
 
  A) It is more restrictive than an implicit lock.
  B) It allows only two transactions to update a record simultaneously.
  C) It locks the item from all access.
  D) It allows reads to the locked item.
  E) It must use a two-phase locking scheme.


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parshano

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

key

Answer to Question 2

D


saliriagwu

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Reply 2 on: Jul 7, 2018
Wow, this really help

billybob123

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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