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What’s the difference between open and closed hashing? Which one is used in database applications, and...

What’s the difference between open and closed hashing? Which one is used in database
applications, and why?

Engineering   Computer-Science   
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Answer #1

OPEN HASHING

  • in this hashing each cell in the array points towards a list which contains the collisions.
  • in this keys are stored in the linked lists attached to cells of the hash table.
  • this produced the same index for all items in the linked lists.

CLOSED HASHING

  • in this hashing type we can use only one array for everything.
  • in this type all the keys are stored in the hash table itself that too without the use of linked lists.
  • we store the collision in the same array .
  • the idea is skip the collision till we find which we want.

DYNAMIC HASHING is used in databas application because this provides a mechanism in which datas are inserted or deleted dynamically and may be on-demand.

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