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Create 1 experiment to demonstrate an aspect of query optimisation by using access-path structures (indexes), decomposition, or denormalisation. Once satisfied with your experiment, post it as a new discussion topic to the AllQuestionsForum on moodle with the subject title _Experiment1_identifier, and the body containing a description of the experiment for all to see (you must use the format described below for your experiments) To Do:
Create 1 practical experiment following this format: Hypothesis (Reason/Theory behind proposing this experiment.): This section must include references to relevant text-books and/or web-resources. Outline what you're trying to prove; Transaction Analysis; Expected Output (how the experiment was supposed to behave); Explain - using examples and references to relevant resources - how the experiment might be expected to behave. If the results don't correlate to what you expected, make an educated comment as to how you believe the MySQL DBMS implementation affected the results. Results:
SQL Query: the exact query being tested (must be a query that clearly demonstrate your hypothesis) State of DB before change EXPLAIN output Time Taken for Query Execution Change you made to the DB (demonstrate your hypothesis) State of the DB after EXPLAIN output Time Taken for Query Execution
Account:
Detail how you carried out the experiment. Detail how you used EXPLAIN or similar DBMS tools. Detail any important considerations such as having to re-load a fresh database, turn off caching etc., state why it is necessary to prepare in the way you suggest.
What is a Data Flow Diagram? Data Flow Diagram: A data flow diagram is the graph that shows flow of data values from their sources in objects in the course of processes whic
Entities Let us first be aware of the question: What are entities? An entity is an object of concern used to show the things in the actual world, e.g., table, car, bo
What are the costs to be considered when a transaction has to be rolled back when recovering from deadlock? Ans: A few transaction will must rolled back (made a victim)
Prepare a data flow diagram for computing the volume and surface area of a cylinder. Inputs are the height and radius of the cylinder. Outputs are the volume and surface area of th
Set Difference If R1 and R2 are two union compatible relations or relations then result of R3 =R1- R2 is the relation that have only those tuples that are in R1 but not in R2.
draw ER diagram of student entity and course entity where attribute of student entity are student roll, student name, student phone and student address and attribute of course enti
Let us now make the E-R diagram for the student database as per the explanation given in the previous section. We can also states the overall logical structure of a database usi
What is a virtual table that draws its data from the result of an SQL SELECT statement? View is a virtual table that draws its data from the result of an SQL SELECT statement.
The PROJECT operation The project operation is used to choose the records with specified attributes as discarding the others based on some related criteria. This is denotes as ∏
Discuss the count function? The COUNT function used returns the number of tuples or values fixed in a query. The count function comprises two types of syntax: (1) COUNT (*)
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