Multiple choice technology databases

An application program containing query with UR

  1. can read data that has been changed and committed.

  2. can read data that has been changed but is not yet committed.

  3. both a and b

  4. neither a or b
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

UR (Uncommitted Read) isolation level allows reading both committed and uncommitted data. An application using UR can read data that has been changed but not yet committed, as well as committed data. The question asks what UR 'can' do, and it can do both - the 'both a and b' option correctly captures this flexibility.

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