Quiz[1211] - Read-Only - WordLayoutReferencesMailingsReviewViewHelp24 - What object Maps one or more tables to a single file?a) Vertical partitionb) horizontal partition tablec) table spaced) Shard25 - a subset of table rows is called aa) Clusterb) fragmentc) vertical partitiond) horizontal partition26 - how does a list partition assign rows to partition?a) I return value from a partition expression that uses VALUES INb) a specified number of partitions assigned with a positive integer values.c) I return value from partition expression that specifies MAX VALUESd) a value that is determined automatically by the database.27 - When a table is assigned to a table space where is the index stored?a) In an adjacent table spaceb) in the same tablespace as the tablec) within the tabled) in the separate tablespace file*-F11FSF8F9F10F1224*458RY 1211] - Read-Only - WordO SearchReferencesMailingsReviewViewHelp20 - Hash index entries are assigned to.a) Valuesb) Clustersc) Bucketsd) Blocks21 - what are the index of an efficient bitmaps index?a) Each bucket has initially one block. Any additional blocks are allocated and linked to an initialblockb) The WHERE clause may specify any values in upper ways. The column used in a WHERE clausemay contain mixed upper- and lower-case characters.c) The database can quickly determine the block containing a table row from the index row mumber.Any indexed column relatively few distinct values.d) Indexes change only when primary key values are updated. physical indexes change whenever arow moves to a new block.22 - A column contains grades from 0 to 10, but uh where clause specifies values from 0 to 100. A.index can be used to modify the column values and process the queries.a) Multi - levelb) logicalc) single - leveld) function23 - In logical index, pointers to table blocks are you pleased withvalues.a) foreign keyb) primary keyc) artificial keyd) composite keyDFocus少**PrtScInsertFOF10%&47.89YK..

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References Mailings Review View Help 20 - Hash index entries are assigned to. a) Values b) Clusters c) Buckets d) Blocks

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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//inserts e at index ind publicvoidadd(intind,Te){ //if index is invalid display a message and return //valid index are 0 to size //push all elements up by one all the down to index ind (stop at index ind) //insert e at index ind //increase the size }
#The Iris Dataset import sklearn.datasetsimport matplotlib.pyplot as plt import numpy as np import scipy iris = sklearn.datasets.load_iris() Write a function that takes in an index i and prints out a verbose desciption of the species and measurements for data point i. For example:Data point 5 is of the species setosaIts sepal length (cm) is 5.4Its sepal width (cm) is 3.9Its petal length (cm) is 1.7Its petal width (cm) is 0.4
Matrix Creation My Solutions > Task: 1. Create a Matrix A with the following properties:Single Row with that starts with 10 and ends with 100. The constant difference is 3. 2. Create a Matrix B which is a column vector that starts with 50 and counts down to 0. 3. Create the following matrices (a) C1 is a 5x5 magic matrix, (b) C2 is a 5x5 identity Matrix. (c) C3 is a 5x5 matrix whose elements are all 3. (d) C4 is a 5x5 zero matrix. 4. Create a matrix D using the command: D = [C1 C2; C3 C4] 5. Create a matrix E using the command: E= [C3 C1; C2 C1] 6. Evaluate: F = D - 2ED + 31 7. Evaluate: G = 4E - 5DE Script e H Save C Reset I MATLAB Documentation 1 %Create a Matrix A with the following properties:Single Row with that starts with 10 and ends with maximui 2 A = 3 % Create a Matrix B which is a column vector that starts with 50 and counts down to 0. 4B = 5 %Create the following matrices 6 % (a) C1 is a 5x5 magic matrix, 7 C1= 8 %(b) C2 is a 5x5 identity Matrix. 9 C2- 10 %(c) C3 is a 5x5…
Q#1: - If you have a matrix NxN+2, the user must enter NxN elements. The program has to implement the following: 1- Find the largest number in each row and then store it in the location before the last location of each row. 2-Find the smallest number in each row and then store it in the last location of each row.
Matrix Creation My Solutions > Task: 1. Create a Matrix A with the following properties:Single Row with that starts with 10 and ends with 100. The constant difference is 3. 2. Create a Matrix B which is a column vector that starts with 50 and counts down to 0. 3. Create the following matrices (a) C1 is a 5x5 magic matrix, (b) C2 is a 5x5 identity Matrix. (c) C3 is a 5x5 matrix whose elements are all 3. (d) C4 is a 5x5 zero matrix. 4. Create a matrix D using the command: D = [C1 C2; C3 C4] 5. Create a matrix E using the command: E= [C3 C1; C2 C1] 6. Evaluate: F = D² – 2ED + 31 7. Evaluate: G = 4E – 5DE Script e A Save C Reset I MATLAB Documentation 1 %Create a Matrix A with the following properties:Single Row with that starts with 10 and ends with maximum value of 100. The constant differer 2 A = 3 % Create a Matrix B which is a column vector that starts with 50 and counts down to e. 4 B = 5 %Create the following matrices 6 % (a) c1 is a 5x5 magic matrix, 7 C1= 8 %(b) c2 is a 5x5…
MongoDB 1) The customers collection includes documents that have accounts as a field that contains an array of values. Write a statement to retrieve a cursor containing all documents where there is only one account. 2) Write a statement that returns only the email addresses of all customer documents. 3) Write a statement to retrieve a cursor containing all customer documents where the active field within the main document (i.e., do not worry about nested documents) is set to true. 4) Write a statement to retrieve a cursor containing all customer documents that do not have the active field within the main document (i.e., do not worry about nested documents). (Hint: Take a look at the Query and Projection operators in the MongoDB documentation to find an operator that helps determine whether a field exists within a document.)
Part B - reading CSV files You will need a Python repl to solve part B. Define a Python function named cheapest_rent_per_state that has one parameter. The parameter is a string representing the name of a CSV file. The CSV file will be portion of a dataset published by the US government showing the median (middle) rent in every county in the US. Each row in the CSV file has the same format Area Name, Efficiency, 1-Bedroom, 2-Bedroom, 3-Bedroom, 4-Bedroom, State Code The data in the Area Name and State Code columns are text. The data in all of the other columns are decimal numbers. Your function will need to use the accumulator pattern to return a dictionary. The keys of that dictionary will be the state codes read in from the file (state codes are at index 6). For each key in the dictionary, it's value should be the smallest median rent for an efficiency in that state (median rents for an efficiency are at index 1). Important Hints: * You will really, really want to use the built-in csv…
struct insert_into_hash_table { // Function takes a constant Book as a parameter, inserts that book indexed by // the book's ISBN into a hash table, and returns nothing. void operator()(const Book& book) { ///// /// TO-DO (8) ||||. // Write the lines of code to insert the key (book's ISBN) and value // ("book") pair into "my_hash_table". /// END-TO-DO (8) // } std::unordered_map& my_hash_table; };
2) Hash Innards Homework • Unanswered Select all true statements from the below. Multiple answers: Multiple answers are accepted for this question Select one or more answers and submit. For keyboard navigation. SHOW MORE V a A hash function takes a key and produces an index into the hash table. The next step in this process is often something like 'h%SIZE' so that the hash value of the key will fit within the table b (having SIZE elements, you see). Common techniques involve exclusive or of bits within the key and folding different sections of bits within the key into each other. The best hash method for character strings is to simply add up the ASCIlI values of their individual characters. Coming up with a perfect hash for a given set of keys can be a difficult and time-consuming task.
PYTHON prov_records_per_date() takes a 2-D list (similar to the database) and an integer representing the province ID. This function returns another 2-D list, where each element of this list stores information in the following format. [ [day1, total number of patients (both icu and non-icu) in this provice reported in day1], [day2, total number of patients (both icu and non-icu) in this provice reported in day2], ... ] >>> results = prov_records_per_date(database, 35) >>> display_dict(result) >>> display_list(result) ['2022-01-31', 239] ['2022-02-05', 393] >>> results = prov_records_per_date(database, 10) >>> display_dict(result)['2022-02-02', 225] >>> results = prov_records_per_date(database, 81) >>> display_dict(result)No data in list
3. lookup_friends_heights This function takes a friends database (a list of dictionaries, like the previous functions) and a list of friends names, and it returns a list of heights for the specified friends. If a given friend's name is not present in the friends database, we put a None in the corresponding slot. We assume that there will be at most one friend with a given name in the list. You may want to use nested for-loops for this function. Sample calls should look like this. >>> lookup_friends_heights([{"name":"todd","height":170},{"name": "sarah", "height":165},{"name":"dweezil", "height":175}], ["dweezil", "sarah"]) [175, 165] >>> lookup_friends_heights([{"name": "todd","height":170},{"name": "sarah","height":165},{"name": "dweezil", "height":175}], %3D ["sarah", "elíza", "dweezil"]) [165, None, 175]
Q6. Which two of the following data structures need the same size in the memory? O Array & Singly Linked List Singly & Doubly Linked List Array & Circular Singly Linked List Singly & Circular Singly Linked List O Array & Doubly Linked List O Doubly & Circular Singly Linked List