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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.
Differentiate between Key and superkey? Key and superkey - A key a single attribute or a combination of two or more attributes of an entity set in which is used to identify o
What is RDBMS terminology for a row? A tuple is a RDBMS terminology for a row
The State of NewYork certifies firefighters throughout state and keep track all of them, as well as of the state’s fire departments. Each fire department has unique department numb
How many levels can be viewed in Architecture of the database ? Architecture of the database can be viewed as three levels.
Gaps in sequence values can happen when: - A rollback happens that is when a statement changes are not accepted. - When the system crashes - When a sequence i
write a short note on participation role? Participation role: roles are indicating in E-R diagram by labelling the lines that connect diamonds to rectangles.
NEED FOR A DATABASE MANAGEMENT SYSTEM A Database is a structured, persistent collection of data of an organisation. The database management system (DBMS) manages the database o
We are looking to find someone to prepare a database which improves upon the one we are using at present. The present database will be found here: Click on filter options and yo
Multi-Key File Organisation In this part, we will introduce two basic file Organisation schemes that permit records to be accessed by more than one key field, therefore, allowi
#explain five disadvantages of a dbms..
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