Discuss why you would want to validate a conceptual data model and describe two approaches to validating a conceptual model.
What will be an ideal response?
We validate a conceptual data model to check the model to ensure that the model supports the
transactions required by this view. Using the model, we attempt to perform the operations
manually. If we can resolve all transactions in this way, we have checked that the conceptual
data model supports the required transactions. However, if we are unable to perform a
transaction manually there must be a problem with the data model, which must be resolved. In
this case, it is likely that we have omitted an entity, a relationship, or an attribute from the data
model.
Two possible approaches to ensuring that the local conceptual data model supports the
required transactions are:
(1) describing the transactions;
(2) using transaction pathways.
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Give an INSERT statement that might cause a phantom.
Consider a schema with two tables, Table1 and Table2, each having three attributes, attr1, attr2, and attr3, and consider the statement
SELECT T1.attr1, T2.attr1 FROM Table1 T1, Table2 T2 WHERE T1.attr2 = T2.attr2 AND T1.attr3 = 5 AND T2.attr3 = 7
Answer the following statement(s) true (T) or false (F)
1. Reconstruction is the first step in the digitization of an analog signal 2. A regular ON/OFF switch is a better device than a transistor for sampling. 3. An analog signal is transformable to a digital signal through the sampling and quantization process. 4. The size of bandwidth in a communication system is one of the parameters that directly affect the efficiency of the system. 5. Increasing the step size will result in lower granular noise.
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Indicate whether the statement is true or false
What are the Amazon EC2 API tools?
A. They don't exist. The Amazon EC2 AMI tools, instead, are used to manage permissions. B. Command-line tools to the Amazon EC2 web service. C. They are a set of graphical tools to manage EC2 instances. D. They don't exist. The Amazon API tools are a client interface to Amazon Web Services.