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Graded Discussion Board (GDB)

Data Warehousing (CS614) 

Dear Students,

GDB of the subject Data Warehousing (CS614) is going to open in a couple of days. Before submitting the GDB, please read all instructions thoroughly.

The GDB will remain open for two days (48 hours).

You may submit your GDB from “August 2, 2018 To August 3, 2018, 11:59 PM”

GDB Topic: 

The task of optimizer is to decide which join technique should be used for a particular search query.  In a decision support system, Sort Merge Join and Hash Based join are some important join techniques which can be used by the optimizer. Discuss some factors on the basis of which optimizer can decide to use either Sort Merge Join or Hash based Join. 

 

Note: A concise, coherent and to the point comment is preferred over lengthy comment having irrelevant details. Comments, posted on regular Lesson's MDB or sent through email will NOT be considered in any case. For any queries please email at CS614@vu.edu.pk

 

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Instructor CS614

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Replies to This Discussion

A hash join is performed by hashing one informational index into memory in light of join sections and perusing the other one and testing the hash table for matches. The hash join is minimal effort when the hash table can be held completely in memory, with the aggregate cost adding up to next to no more than the cost of perusing the informational collections. The cost rises if the hash table must be spilled to plate in a one-pass sort, and rises significantly for a multi pass sort

read the question again

Discuss some factors on the basis of which optimizer can decide to use either Sort Merge Join or Hash based Join. 

optimizer will use  merge join when data is sorted and hash join when data is not sorted.

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