Assignment No. 03
CS614: Data Warehousing
Total Marks: 15
Due Date: 27-Jan-2020
The objective of this assignment is to enhance the learning capabilities of the students about:
· Join Techniques
· Hash based join
· Sort-Merge join
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HyperMart is an online shopping store currently acquiring a large number of customers.
Normalized table structures for the shopping store are given below:
Order details Table
· Assume 1:12 record count ratio between Order and Order detail for online store’s database
· Assume 10,000 orders
For the given relations you are required to calculate the following costs in terms of I/O operations and find out which joining technique is better for given scenario. Tasks you are required to perform are as under;
1. Cost of Sort-Merge Join
2. Cost of Hash-Join
3. On the basis of your calculations, suggest better joining technique between sort-merge and hash join for the given scenario
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I suggest Hash-Join
Using the hash function on the hash keys guarantees that any two joining records must be in the same pair of files. Therefore, the task of joining two large inputs has been reduced to multiple, but smaller, instances of the same tasks. The hash join is then applied to each pair of partitioned files.
This is just a idea solution. Make your OWN :)
Thanks for sharing ...
CS614 Assignment No 02 Solution Fall 2019