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Mr. Dubey • 100.69K Points
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Q. Instead of locking index leaf nodes in a two-phase manner, some index concurrency- control schemes use on individual key values, allowing other key values to be inserted or deleted from the same leaf.

  • (A) b+ tree locking
  • (B) link level locking
  • (C) key-value locking
  • (D) next value locking
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