You are operating a distributed Cassandra database with a keyspace setup with the following command: create keyspace nosql with replication = {'class':'SimpleStrategy', 'replication_factor':5}; What is the minimum number of replicas that need to be available to complete a write to a table in this keyspace when writing with a consistency level of Quorum? Group of answer choices 2 3 4 5

You are operating a distributed Cassandra database with a keyspace setup with the following command: create keyspace nosql with replication = {'class':'SimpleStrategy', 'replication_factor':5}; What is the minimum number of replicas that need to be available to complete a write to a table in this keyspace when writing with a consistency level of Quorum? Group of answer choices 2 3 4 5

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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class Database:def __init__(self, db_name):self.db = sqlite3.connect(db_name)self.cursor = self.db.cursor()def create_table(self, table_schema):self.cursor.execute(table_schema)self.db.commit()def insert_data(self, table_name, data):for i in range(len(data)):keys = ", ".join(data.columns)values = ", ".join([f"'{value}'" if pd.isna(value) else str(value) for value in data.iloc[i]])self.cursor.execute(f"INSERT INTO {table_name} ({keys}) VALUES ({values})")self.db.commit()def search_data(self, table_name, year):self.cursor.execute(f"SELECT * FROM {table_name} WHERE year={year}")result = self.cursor.fetchone()if result is not None:return resultelse:return Nonedef delete_data(self, table_name, year):self.cursor.execute(f"DELETE FROM {table_name} WHERE year={year}")self.db.commit()return self.cursor.rowcount > 0 Please rewrite (or convert) the code above with format: def QueryBuilder( Data_Base, Query_Type, Query_Tuple):'''''' Build Query_String'''''' return Query_String
We want to create a user who has only permission to execute "SELECT" sql statement for all tables in CustomDatabase1. I Login Properties - userl Select a page O Script - O Help General Server Roles P User Mapping * Securables * Status Users mapped to this login: Мар Database User Default Schema AdventureWorks2019 badb CovidDB CovidDB2 Credit DB CustomDatabase 1 user1 CustomDatabase2 digiwal master model msdb Northwind Northwind2 Connection Nothwind3 Guest account enabled for: CustomDatabase1 Server: BSA738 Database role membership for: CustomDatabase1 Connection: |db_accessadmin |db_backupoperator db_datareader db_datawriter |db_ddladmin db_denydatareader | db_denydatawriter db_owner |db_secuntyadmin public sa vi View connection properties Progress Ready OK Cancel Which database role of the following should be selected? Select one: a. db_accessadmin O b. db_securityadmin O c. db_denydatareader O d. db_datareader O e. db_datawriter D0000D00000 0od OOOD
Write a script that implements the following design in a database named my_web_db: users downloads products product_id INT O product_name VARCHAR(45) user_id INT download_id INT email_address VARCHAR(100) user_id INT O first_name VARCHAR(45) KO download_date DATETIME Indexes Olast_name VARCHAR(45) O filename VARCHAR (50) Indexes O product_id INT Indexes In the Downloads table, the user_id and product_id columns are the foreign keys. Include a statement to drop the database if it already exists. Include statements to create and select the database. Include any indexes that you think are necessary. Specify the utf8mb4 character set for all tables. Specify the InnoDB storage engine for all tables.
In this database we have users that can be two types students or instructors. They have groups and memberships. Any user can post and the post type can be video, photo or text. Here is the table structure: CREATE TABLE USER_ ( USER_ID INT NOT NULL AUTO_INCREMENT, CREATE_DATE DATE NOT NULL, PROF_DESC VARCHAR (100), PROF_PIC VARCHAR(40), LOCATION VARCHAR (40) NOT NULL, PRIMARY KEY (USER_ID) ); CREATE TABLE USER_INFO( USER_ID INT NOT NULL, SU_EMAIL CHAR(18), USER_FNAME VARCHAR(15), USER_LNAME VARCHAR (15), USER_DOB DATE, USER_GENDER CHAR(1), PRIMARY KEY (USER_ID), FOREIGN KEY (USER_ID) REFERENCES USER_(USER_ID) ON UPDATE CASCADE ); CREATE TABLE STUDENT ( SU_ID INT NOT NULL, USER_ID INT NOT NULL, YEAR_ VARCHAR (10), MAJOR VARCHAR (20), LOCATION VARCHAR (40) NOT NULL, PRIMARY KEY (SU_ID), FOREIGN KEY (USER_ID) REFERENCES USER_(USER_ID) ON UPDATE CASCADE ); CREATE TABLE INSTRUCTOR ( SU_ID INT NOT NULL, USER_ID INT NOT NULL, DEPARTMENT VARCHAR (40), INSTR_TYPE VARCHAR (40),…
You notice that the database instance takes a long time to start up after the instance crash. How will you resolve the problem? a) Increase the size of the redo log files b) Decrease the number of redo log members c) Set LOG_CHECKPOINT_TO_ALERT to TRUE d) Decrease the value for the FAST_START_MTTR_TARGET initialization parameter
Write a script that adds an index to the MyGuitarShop database for the zip code field in the Addresses table. Write a script that implements the following design in a database named MyWebDB: In the Downloads table, the UserID and ProductID columns are the foreign keys. In the Users table, the EmailAddress and LastName columns are required, but the FirstName column is not. Include a statement to drop the database if it already exists. Include statements to create and select the database. Include any indexes that you think are necessary. 3. Write a script that adds rows to the database that you created in exercise 2. Add two rows to the Users and Products tables. Add three rows to the Downloads table: one row for user 1 and product 1; one for user 2 and product 1; and one for user 2 and product 2. Use the GETDATE function to insert the current date and time into the DownloadDate column. Write a SELECT statement that joins the three tables and retrieves the data from these tables like…
Create a Java application for Checkers called CheckersStockTakingApp. The application should consist of a client side, a server side and a database.4.1 Create a database called checkersproducts using MySQL or any relational database management software you are comfortable with. The database should have a table called products that consists of the following columns and properties:prodID AUTO NUMBER (primary)prodName VARCHAR (30)prodType VARCHAR (30)prodPrice DECIMAL (6,2)4.2 Create a server class that will do the following:• Run on port 8000 and listen to a client• Initially output a “server is starting” message to the screen• Make a connection to the database• Receive product details from the client• Add product details to products table• Send a message back to client to inform whether or not the product was added• Handle any exceptions• Close the server when the user types "stop" on the client side and output a message"Server stopping...." 4.3 Create a client class that will do the…
The code shown below is designed to increment through each row in a database table. Correct the error in the code.For intRecordCount = 0 To datPeople.Rows.Count' Processing statementsNext
In python code: Using the dataframe produced in question#2 and your Database class from Lab1, Byte Stream your dataframe into your Database object. Also, use your Query Builder to build the Insert Query for your byte stream insertion. class GreenhouseGas(NamedTuple): Gas: str Pre_1750: float Recent: float Absolute_increase_since_1750: float Percentage_increase_since_1750: float def __repr__(self): return f"Gas: {self.Gas}, Pre-1750: {self.Pre_1750}, Recent: {self.Recent}, Absolute increase since 1750: {self.Absolute_increase_since_1750}, Percentage increase since 1750: {self.Percentage_increase_since_1750}" def __lt__(self, other): return self.Recent < other.Recent def __eq__(self, other): return self.Gas == other.Gas @classmethod def from_list(cls, data): gas, pre_1750, recent, absolute_increase, percentage_increase = data return cls(gas, pre_1750, recent, absolute_increase, percentage_increase) def…
Create an Express.js backend that allows users to book vaccine appointments. You will have to design an MVC structure. Create a model that describes an appointment document. Each document has the following properties: cardNumber - String Create a controller that implements: add appointment, list appointments, delete an appointment from the database and refresh the view. In development.js file, name the MongoDB database: YourFullName-appointment-db. 123 Card Number: 123 567 Card Number: north york morning side vaccineSite - String priorityArea - String (validate using an enum list that contains ['80+', 'healthcare', 'essential'] dateTime - Date cancelled - Boolean Vaccine Appointments Date/Time: Vaccine Site: Vaccine Site: 80+ 80+ healthcare Priority Area: north york Write a React UI to allow the user to book vaccine appointements: - A React form will be used to add appointment information (as shown above) A React form will be used to display a list of appointments as shown below. The…
For on ordered file based on key attribute, the following index can be created: O Clustering. O Primary. Secondary.
Write a program that views, inserts, and updatesstaff information stored in a database, as shown in Figure a. The View buttondisplays a record with a specified ID. The Insert button inserts a new record. TheUpdate button updates the record for the specified ID. The Staff table is createdas follows:create table Staff (id char(9) not null,lastName varchar(15),firstName varchar(15),mi char(1),address varchar(20),city varchar(20),state char(2),telephone char(10),email varchar(40),primary key (id));