Q:

When transaction Ti requests a data item currently held by Tj

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When transaction Ti requests a data item currently held by Tj , Ti is allowed to wait only if it has a timestamp smaller than that of Tj (that is, Ti is older than Tj ). Otherwise, Ti is rolled back (dies). This is


  1. Wait-die
  2. Wait-wound
  3. Wound-wait
  4. Wait

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 (a).Wait-die

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