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Draw a DFD (Context and Level 1) for placing an order based on the E-R diagram shown here.
Some recommended major processes are:
(1) Enter new order(2) Read customer master(3) Read item record(4) Create item order record(5) Add order record
Developers have noticed that EMP table doesn't have an assigned primary key. EMP_ID column has been selected to be the primary key.
How does Oracle process this query? That is, what does Explain Plan tell you about how the query is processed - how would you recognize that the results were not correct?
The Relational Data Model (RDM) which corresponds to the ERD in the format shown below. The RDMMUSTidentify all primary keys, alternate keys and foreign key constraints. Raw SQL Create Table script dumps from a modeling tool, or SQL Server WILL NO..
Identify and explain the differences between a stack and a queue data structure
Your supervisors and customers are very impressed with the database you have put together. Describe a minimum of three heuristics to optimize Queries.
How can you make your database more hacker proof? How do you ensure the security of an organizations distributed database?
These comprise NOT NULL, CHECK, UNIQUE, REFERENTIAL INTEGRITY, and PRIMARY KEY constraints. Are these constraints which we are talking about easy to implement in Access Database?
Indexing can affect the performance of a general-purpose database that has roughly equal numbers of fetches and changes. The decision to add an index can improve the performance of a system but can also degrade it.
Webster Library wants to know how many green books it has. Out of the 500 shelves of books, 3 shelves were selected. These shelves hold 150 books each. 54 of the books sampled were green.
Explain efficient algorithm that, provided edge-labeled graph G with distinguished vertex v0 and sequence s = σ1, σ2, ..., σk of characters from Σ, returns path in G which begins at v0.
Your job is to create a database management system for bike shop who ‘buys' and ‘sells' new and second-hand bikes, and also parts of bike. Bike is constructed with parts while part can be fitted to different bikes.
You should choose a data storage problem of your interest and identify the different pieces of data that should be stored in database.
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