Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Chapter 17, Problem 7PE
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Main reasons:
- The Common Gateway Interface (CGI) usually starts a new process for serving each and every request.
- Starting a new process every time significantly increases the
operating system (OS) overhead.
- Starting a new process every time significantly increases the
- Conversely, servlets are executed as threads of an already existing process.
- Executing threads from an existing process typically reduces the OS overhead.
- Additionally, the process executing threads can be the webserver process itself...
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Based on our lectures and the BELLMAN-FORD algorithm below, answer the following questions.
BELLMAN-FORD (G, w, s)
1
INITIALIZE-SINGLE-SOURCE (G, s)
2 for i = 1 to |G. VI - 1
3
4
5
6
7
8
for each edge (u, v) = G.E
RELAX(u, v, w)
for each edge (u, v) = G.E
if v.d> u.d+w(u, v)
return FALSE
return TRUE
1. What does the algorithm return?
2. Analyze the complexity of the algorithm.
Given the radix sort algorithm to sort an array A of decimal numbers, each has d digits:
RADIX-SORT(A, n, d)
1 for i = 1 to d
2
use a stable sort to sort array A[1:n] on digit i
1. Analyze the complexity of the algorithm to show whether it is a linear time algorithm.
2. Can we use the radix sort algorithm to sort an array of strings? If yes, then how?.
(Short-answer) b. Continue from the previous question. Suppose part of the data you extracted from the data warehouse is the following. Identify the missing values you think exist in the dataset. Use Column letter and Row number to refer to each missing value in the dataset. Please write down how you want to address each particular missing value (you can group them if they receive same treatment). For imputation, you do not need to calculate the exact imputed values but just describe what kind of value you want to use to impute.
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- Student ID is 24241357arrow_forwardWhich of the following methods help when a model suffers from high variance? a. Increase training data. b. Increase model size. c. Decrease the amount of regularization. d. Perform feature selection.arrow_forward57 Formula 1 point Use shift folding, length 3, on the following value to calculate the Hash Value. 114184121 Type your answer...arrow_forward
- Write a program that reads a list of 10 integers, and outputs those integers in reverse. For coding simplicity, follow each output integer by a space, including the last one. Then, output a newline. Ex: If the input is: 2 4 6 8 10 12 14 16 18 20 the output is: 20 18 16 14 12 10 8 642 To achieve the above result, first read the integers into an array. Then output the array in reverse. 623802 1031906 nx3zmv7.arrow_forward6.3B-2. Multiple Access protocols (2). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access nodes at times t=0.1, 0.8, 1.35, 2.6, 3.9, 4.2. Each transmission requires exactly one time unit. 1 2 3 4 t=0.0 t=1.0 t=2.0 t=3.0 5 6 t=4.0 t=5.0 For the slotted ALOHA protocol, indicate which packets are successfully transmitted. You can assume that if a packet experiences a collision, a node will not attempt a retransmission of that packet until sometime after t=5. 1 2 3 4 5 Karrow_forwardProblem of checking Compile errors Runtime errors ======== } ng; } You have the following IQueue interface. Implement a Queue class derived from IQueue. You can use STL containers discussed in class, such as vector, queue, stack, deque, map. #include using namespace std; class IQueue { public: }; virtual void Enqueue(int val) virtual int Dequeue() = 0; virtual int Size() const = 0; int main() = 0; { Queue q; ===== } cout << q.Size() << endl; q. Enqueue(10); q.Enqueue(20); q. Enqueue(30); cout << q.Size() << endl; cout << q.Dequeue() << endl; cout << q.Size() << endl; cout << q.Dequeue() << endl; cout << q.Size() << endl; cout << q.Dequeue() << endl; cout << q.Size() << endl; ==== ====arrow_forward
- logicarrow_forwardQ1: For the Figure Below if the input to the first tank is step with magnitude 2 find 1. What type of relation between (tanks 1 and 2) and tank 3 2. Initial real value of H2, if the steady state value is 10 3. Final Value of H3 4. H1 at t=1.5 5. For the system tank1 and tank 2 only which case is applied to them (overdamping, underdamped or critically damping) A₁=1 A₂=1 Tank 1 R₁ = 2 * Tank 2 R₁₂=2 A3=0.5 hy R₁=4 Tank 3arrow_forwardPlease original work Talk about the most common challenges encountered in a data warehouse What are some creative ways to overcome those challenges What is for one real world example where your method would be effective Please cite in text references and add weblinksarrow_forward
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