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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.
Q. Describe how an ER schema can be represented by relation schemas and constraints arising from ER design can be mapped to constraints on a relation schema. The entity rela
Scenario: You are a freelance database designer who has just been contacted by a small software development company named Altair Software. The president of the company has asked
What is a primary index? A primary index is an index whose search key also explains the sequential order of the file.
external view of DBMS in healthcare department?
Determine the Other System Design Issue How to realise subsystems; through hardware or software? How is object model mapped on chosen hardware software? Mapping
What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
management information system based on functional organisation
INTRODUCTION Databases and database systems have become an essential part of our daily life. We encounter many activities that involve some interaction with a database almost
Backward Recovery (UNDO): In this system the uncommitted changes made by a transaction to a database are undone. Instead the system is reset to the last consistent state of databa
Define the term Domain. For each n every attribute there is a set of permitted values known as the domain of that attribute.
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