The data structure store homogeneous elements in consecutive memory location , and not permit insertion & deletion . physically Lists. O Batches. O Files. Arrays. O The array is an index structure satisfy Static storage allocation. O Non homogeneous data elements? O Increase the response time. Sequential access. O

The data structure store homogeneous elements in consecutive memory location , and not permit insertion & deletion . physically Lists. O Batches. O Files. Arrays. O The array is an index structure satisfy Static storage allocation. O Non homogeneous data elements? O Increase the response time. Sequential access. O

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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Code in python. Assume the variable dct references a dictionary. Write code that pickles the dictionary and saves it to a file named mydata.dat.
Threads Task # 1 Write a program using pthreads, which calculates the sum of elements in a hard-coded integer array in parallel using 4 threads. The program must divide the work between 4 threads which run simultaneously. For simplicity, you can assume that the size of the array is 100. Note that the integer array must be declared as a global data structure. Initially code your solution so that the sum of elements is maintained in a global shared variable. Each thread modifies the same shared variable as it sums up elements from the array. Use a suitable synchronization primitive (mutex)
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def delete_account(user_accounts, log_in, bank, username, password): ''' Completely deletes the user from the online banking system. If the user exists in the user_accounts dictionary and the password is correct, and the user is logged in (the username is associated with the value True in the log_in dictionary): - Deletes the user from the user_accounts dictionary, the log_in dictionary, and the bank dictionary. - Returns True. Otherwise: - Returns False. For example: - Calling delete_account(user_accounts, log_in, bank, "BrandonK", "123abcABC") will return False - Calling delete_account(user_accounts, log_in, bank, "Brandon", "123abcABDC") will return False - If you first log "Brandon" in, calling delete_account(user_accounts, log_in, bank, "Brandon", "brandon123ABC") will return True
createDatabaseOfProfiles(String filename) This method creates and populates the database array with the profiles from the input file (profile.txt) filename parameter. Each profile includes a persons' name and two DNA sequences. 1. Reads the number of profiles from the input file AND create the database array to hold that number profiles. 2. Reads the profiles from the input file. 3. For each person in the file 1. creates a Profile object with the information from file (see input file format below). 2. insert the newly created profile into the next position in the database array (instance variable).
Please answers fast Implement an external sort, which uses intermediate files to sort files bigger than main memory. Why Mergesort is a better algorithm than heapsort or quicksort to base such an implementation on? Test your program both on files with small records and on files with large records.
Which of the following statements is the correct format to delete a dynamic array from the pointer named blue? delete [] *blue; Oa. delete *blue; Ob. delete [] blue; c. delete blue; d.
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Implement RemoveLastCommand's execute() method to remove source_list's last element. Step 4: Implement GroceryList's execute_undo() method Implement GroceryList's execute_undo() method to do the following: Pop an UndoCommand off the undo stack • Execute the popped undo command File main.py has code that reads in a list of commands, one per line, that allow for basic testing of basic operations. So after implementing execute_undo(), run your program with the following input: add bananas add grapes add strawberries print undo print undo print quit Verify that the corresponding output is: 0. bananas 1. grapes 2. strawberries 0. bananas 1. grapes 0. bananas The program's output does not affect grading, so additional test cases can be added, if desired. Submitting code written so far to obtain partial credit is recommended before proceeding to the next step. Step 5: Implement the SwapCommand class and GroceryList's swap_with_undo() method