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posledela
2 years ago
13

4. When emergency changes have to be made to systems, the system software may have to be modified before changes to the requirem

ents have been approved. Suggest a model of a process for making these modifications that will ensure that the requirements document and the system implementation do not become inconsistent.
Computers and Technology
1 answer:
Vikentia [17]2 years ago
7 0

Answer:

Incremental model

Explanation:

Incremental model is the best modification in older version are feasible and can be easily managed.

Incremental model involves the technique of developing soft ware in which the product is designed implemented and tested in stages until the product is finished. The term finished here means the product as meet all its requirement.

This model entails development as well as maintenance.

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Referential integrity constraints are concerned with checking INSERT and UPDATE operations that affect the parent child relation
Jet001 [13]

Answer:

a) true

Explanation:

In Computer programming, integrity constraints can be defined as a set of standard rules that ensures quality information and database are maintained.

Basically, there are four (4) types of integrity constraints and these are;

1. Key constraints.

2. Domain constraints.

3. Entity integrity constraints.

4. Referential integrity constraints.

Referential integrity is a property of data which states that each foreign key value must match a primary key value in another relation or the foreign key value must be null.

For instance, when a foreign key in Table A points to the primary key of Table B, according to the referential integrity constraints, all the value of the foreign key in Table A must be null or match the primary key in Table B.

Hence, the referential Integrity constraints ensures that the relationship between the data in a table is consistent and valid.

Hence, referential integrity constraints are concerned with checking INSERT and UPDATE operations that affect the parent child relationships.

<em>This ultimately implies that, referential Integrity are rules used in database management systems (DBMS) to ensure relationships between tables when records are changed is VALID (INSERT and UPDATE).</em>

<em>In a nutshell, it always ensures a primary key must have a matching foreign key or it becomes null. </em>

6 0
2 years ago
Define a function compute_gas_volume that returns the volume of a gas given parameters pressure, temperature, and moles. Use
jeyben [28]

Question:

Define a function compute_gas_volume that returns the volume of a gas given parameters pressure, temperature, and moles. Use the gas equation PV = nRT, where P is pressure in Pascals, V is volume in cubic meters, n is number of moles, R is the gas constant 8.3144621 ( J / (mol*K)), and T is temperature in Kelvin.

Answer:

This solution is implemented in C++

double compute_gas_volume(double P, double T, double n){

   double V = 8.3144621 * n * T/P;

   return V;

}

Explanation:

This line defines the function, along with three parameters

double compute_gas_volume(double P, double T, double n){

This calculates the volume

   double V = 8.3144621 * n * T/P;

This returns the calculated volume

   return V;

}

To call the function  from the main, use:

<em>cout<<compute_gas_volume(P,T,n);</em>

<em />

<em>Where P, T and n are double variables and they must have been initialized</em>

5 0
2 years ago
In a transaction-processing system (tps), if the tps database can be queried and updated while the transaction is taking place,
Alona [7]
This is called Real time processing. A Transaction Processing System (TPS) is a kind of data framework that gathers, stores, adjusts and recovers the information exchanges of an undertaking. Exchange handling frameworks additionally endeavor to give unsurprising reaction times to demands, despite the fact that this is not as basic with respect to continuous frameworks.
6 0
2 years ago
Write the printitem() method for the base class. sample output for below program: last name: smith first and last name: bill jon
ella [17]
The question involves basic polymorphism. The following is the partial flow of the program.

baseItemPtr = new BaseItem();
baseItemPtr.setLastName("Smith");

derivedItemPtr = new DerivedItem();
derivedItemPtr.setLastName("Jones");
derivedItemPtr.setFirstName("Bill");

itemList.add(baseItemPtr);
itemList.add(derivedItemPtr);

for (i = 0; i < itemList.size(); ++i) {
itemList.get(i).printItem();
}

return;
7 0
2 years ago
Read 2 more answers
The process of checking data for validity and integrity before placing it in a data warehouse is called Group of answer choices
guajiro [1.7K]

Answer:

data cleaning

Explanation:

Data cleaning exemplifies the process which includes identifying the incorrect, or inaccurate data from the records. It further proceeds its function in correcting and replacing the correct data in the records or database. By adding information, by deleting incorrect information and modifying the incorrect information are some of the ways by which data cleaning is done.

7 0
2 years ago
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