SDS Exam Dumps | What is TRUE for "rehashing"?

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DASCA.SDS.v2025-10-13.q37
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Question 11/37

What is TRUE for "rehashing"?

A. Allocate a new, larger hash table in memory

B. It requires a new hash function, which maps values into a larger range of integers

C. Key/value pairs from the original table can be inserted into the new, larger one

D. Both A and B

E. All of the above

Correct Answer: E

Rehashing is a technique used in dynamic hash tables when the load factor (ratio of entries to bucket size) exceeds a certain threshold. It ensures efficient lookup, insertion, and deletion operations.
Option A (Correct): A larger hash table is allocated in memory to accommodate more entries.
Option B (Correct): A new hash function is typically required to map keys into the expanded table range.
Option C (Correct): All key-value pairs from the old table are re-inserted (rehashed) into the new table using the new hash function.
Since all three conditions (A, B, and C) are true, the best choice is Option E (All of the above).
Reference:
DASCA Data Scientist Knowledge Framework (DSKF) - Programming for Data Science: Data Structures & Hashing Techniques

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