Question: A particular Table in a relational database contains 100,000 Data Records/rows, each of which Data Record/row requires 200 bytes. A SELECT statement returns all Data

A particular Table in a relational database contains 100,000 Data Records/rows, each of which Data Record/row requires 200 bytes. A SELECT statement returns all Data Records/rows in the Table that satisfy an equality search on an attribute.

Question: Estimate the time in milliseconds to complete the query when each of the following Indexes on that attribute is used. (Question is asking for query, not insert!)

Assume a Page size of 4K bytes or 4,000 bytes and a Page access time of D = 20ms.

A. No Index (Heap File of Data Records)

ANSWER:

B. A Static Hash Index (with no overflow buckets/Pages). Assume the cost of applying the hash function is H, negligible.

A particular Table in a relational database contains 100,000 Data Records/rows, each

ANSWER:

C. A clustered - sparse, unintegrated B⁺ Tree Index. Assume a Data Entry k* size of 100 bytes and assume 75% occupancy.

of which Data Record/row requires 200 bytes. A SELECT statement returns all ANSWER:

Static Hashing Buckets Hash Computation Static Hashing Buckets Hash Computation

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