Solution-How a partition hash join would perform a natural

How a partition hash join would perform a natural join

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Reference no: EM132406582

Question 1:
Question: Both database management systems (DBMS) and operating systems (OS) provide access to files and implement optimizations for file data access. A DBMS provides significantly better performance for data in databases. How does the DBMS do this? What information does it use? How does it optimize access? Provide some examples.

Question 2:

Assume that:
1. The query processing engine can use four blocks in the buffer pool to hold disk blocks.
2. The records are fixed size, and each block contains 3 records.
3. There are two relations are R and S. Their formats on disk are:

R S
	(1,R),(2,R),(3,R)	(4,R),(5,R),(6,R)	(7,R),(8,R),(9,R)

	(11,S),(4,S),(21,S)	(3,S),(31,S),(13,S)	(5,S),(27,S),(23,S)

Explain how a partition hash join would perform a natural join. You should illustrate your explanation using diagrams of the form below for various steps in the processing:

Step N:

Buffer Pool	R S	Files
(1,T1),(4,1^-1),(731)		(1,R),(2,R),(3,R)	(4,R),(5,R),(6,R)	(7,R),(8,R),(9,R)
(1,R),(2,R),(3,R)
		(11,S),(4,S),(21,S)	(3,S),(31,S),(13,S)	(5,S),(27,S),(23,S)
(4,R),(5,R),(6,R)

(7,R),(8,R),(9,R)
		(3,11),(6,1^-1),(9,T1)

The notation (n,X) means the record in file/relation X with value n for the key. Ti is a temporary file/relation that is created during the processing. You will likely have to create more than one temporary files.

Reference no: EM132406582

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How a partition hash join would perform a natural join

Reference no: EM132406582

Reference no: EM132406582

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