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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
Files
(1,T1),(4,1-1),(731)
(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.
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