Example of database optimisation, Database Management System

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.

Posted Date: 2/26/2013 12:39:53 AM | Location : United States







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