Consider the following stream of page references: 01243032453212 Assume there are 3 page frames available, and LRU replacement policy is used. And fill in page numbers to demonstrate the replacement behavior of the replacement policy with the above page stream. 000444 1 1 1 3 3 22 20

Consider the following stream of page references: 01243032453212 Assume there are 3 page frames available, and LRU replacement policy is used. And fill in page numbers to demonstrate the replacement behavior of the replacement policy with the above page stream. 000444 1 1 1 3 3 22 20

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Scenario: You have been tasked with building a URL file validator for a web crawler. A web crawler is an application that fetches a web page, extracts the URLs present in that page, and then recursively fetches new pages using the extracted URLs. The end goal of a web crawler is to collect text data, images, or other resources present in order to validate resource URLs or hyperlinks on a page. URL validators can be useful to validate if the extracted URL is a valid resource to fetch. In this scenario, you will build a URL validator that checks for supported protocols and file types.
Create a new file cart.html You must get and set the data on the web page by using document.getElementById( ). Each HTML element on the web page already has an id so it is easy. No need for a loop to go through the list of products, there is only 2 products and the info is hard coded on the web page. You must write the code for function cartTotal().
By using the concept of double linked list you are required to implement a module for a social networking site. You have to keep track of user’s posts.A post is comprised of following:1- Message2- Shared with (Public, Friends, Private)3- DateYou have to provide a user friendly interface for the user1. New post2. View posts2.1. View newer post2.2. View by privacy2.3. View allWhen user is viewing the post following options would be available for the user:Press N for next postPress P for the previous postPress E to edit the postPress D to delete the post3. Exit
Find three patterns respositories for webapp patterns, select one patterns from each and present an abbreviated decription of it.
2. Start with an empty buffer pool of size 4 pages again. This time use this access pattern:♯SAGLIKLIMUTLUBAYRAMLAR♯. At the end of accessing all the pattern, what is the content ofthe buffer pool (write in alphabetical order)? Use the LRU algorithm as the buffer replacementpolicy.
The text edited by a line editor is represented by a doubly linked list of nodes, each of which contains an 80 column line of text (type LineType). There is one external pointer (type LineType*) to this list, which points to the "current" line in the text being edited. The list has a header node, which contains the string "- - - Top of File - - -" and a trailer node, which contains the string "- - - Bottom of File - - -". a. Draw a sketch of this data structure. b. write the type declaration to support this data structure. c. write the class constructor, which sets up the header and trailer nodes.
Implement linked list in the following activities. 1. Create a program that will input five (5) Hotel Room Number and display all entered data. Use the function display to display all data. (filename; link_display.c) 2. Create a program that will input five (5) Hotel Rate and display all entered data. Then insert 1 Hotel Room Number at the beginning of the linked list.(Filename: link_insertbeg.c) 3. Create a program that will input five (5) Hotel Rate and display all entered data. Then insert 1 Hotel Room Number at the end of the linked list.(Filename: link_insertend.c) 4. Create a program that will input five (5) Hotel Rate and display all entered data. Then insert 1 Hotel Room Number in positon 3 of the linked list.(Filename: link_insert_nth.c) 5. Merge all the programs into one program. (Link_Merge.c) The software use: C++ or Moblie C C languages
Part C Consider the standard web log file in assets/logdata.txt. This file records the access a user makes when visiting a web page (like this one!). Each line the log has the following items: • a host (e.g., '146.204.224.152') a user_name (e.g., 'feest6811' note: sometimes the user name is missing! In this case, use '-' as the value for the username.) • the time a request was made (e.g., '21/Jun/2019:15:45:24 -0700') • the post request type (e.g., 'POST /incentivize HTTP/1.1' note: not everything is a POST!) Your task is to convert this into a list of dictionaries, where each dictionary looks like the following: example_dict = {"host":"146.204.224.152", "user_name":"feest6811", "time":"21/Jun/2019:15:45:24 -0700", "request":"POST /incentivize HTTP/1.1"} In [ ]: import re def logs(): with open ("assets/logdata.txt", "r") as file: logdata = file.read() # YOUR CODE HERE raise NotImplementedError(() In [ ]: assert len(logs()) == 979 one_item={'host': '146.204.224.152', 'user_name':…
Consider the standard web log file in assets/logdata.txt. This file records the access a user makes when visiting a web page (like this one!). Each line of the log has the following items: • a host (e.g., '146.204.224.152') • a user_name (e.g., 'feest6811' note: sometimes the user name is missing! In this case, use '-' as the value for the username.) • the time a request was made (e.g., '21/Jun/2019:15:45:24 -0700') • the post request type (e.g., 'POST /incentivize HTTP/1.1' note: not everything is a POST!) Your task is to convert this into a list of dictionaries, where each dictionary looks like the following: example_dict = {"host": "146.204.224.152", "user_name": "feest6811", "time":"21/Jun/2019:15:45:24 -0700", "request": "POST /incentivize HTTP/1.1"} def logs (): with open("assets/logdata.txt", "r") as file: logdata = file.read() #YOUR CODE HERE raise NotImplementedError() one_item= {'host': '146.204.224.152', 'user name': 'feest6811', 'time': '21/Jun/2019:15:45:24 -0700',…
Q1. Alter Character casing. Write the source code of a “self-calling/self-processing” PHP page. This page should ask a string(text) from the user and then when submitted via POST method; should display the string(text) as it is submitted, and in altered casing characters (if applicable). Note that altering should start with a capital letter(the first character is always capital). The sample run is presented below. Hint: The location of characters(indexes) is very important.
save_compressed_image: takes a nested list and a filename (string) as input, and saves it in the compressed PGM format to a file with the given filename. If the image matrix given as input is not a valid compressed PGM image matrix, instead raise a AssertionError with an appropriate error message. >>> save_compressed_image([["0x5", "200x2"], ["111x7"]], "test.pgm.compressed") >>> fobj open("test.pgm.compressed", 'r') >>> fobj.read() = 'P2C\\n7_2\\n255\\n0x5 200x2\\n111x7\\n' >>> fobj.close() >>> image [["0x5", "200x2"], ["111x7"]] >>> save_compressed_image(image, "test.pgm") >>> image2 = >>> image True = == load_compressed_image("test.pgm") image2 • save_image: takes a nested list and a filename (string) as input. Checks the type of elements in the list If thou are intogors thon saves the posted list as a PCM imago matrix into a file with the given
Suppose that the virtual page reference stream contains repetitions of long sequences of page references followed occasionally by a random page reference. For example, the sequence: 0, 1, ... , 511, 431, 0, 1, ... , 511, 332, 0, 1, ... consists of repetitions of the sequence 0, 1, ... , 511 followed by a random reference to pages 431 and 332. (a) Why will the standard replacement algorithms (LRU, FIFO, clock) not be effective in handling this workload for a page allocation that is less than the sequence length? (b) If this program were allocated 500 page frames, describe a page replacement approach that would perform much better than the LRU, FIFO, or clock algorithms.