Computers and Technology, 27.10.2021 01:50 Carri425

The design of a RDBMS architecture maintains a logical level (Conceptual view) and a physical level (actual File storages) of a database Independently, which makes RDBMS thriving over rapid changes in complex modern enterprise database systems. Describe how this independence between a logical level and a physical level can be achieved in RDBMS by explaining how a view is maintained and a view query (that is a query with view) is processed in RDBMS using the following example Q1 and the view v1 below Create View v1 (x1, sum_y1) As
Select t1.x1, Sum(t1.y1)
From t1
Group By t1.x1:
1-1) Specify which subsystem of a SQL Server in the following is in charge of view processing mechanism? The subsystems of a SQL Server for query processing are: Syntaxer, Resolver, Optimizer, or File Execution subsystem.
1-2) Show the view processing mechanism how Q1 - the query with a view below is processed when the query Q1 is submitted to a RDBMS server. Assume that v1 is already created in the system and you can name the temporary table in the view processing as needed.
Q1: Select*
From v1. t2
Where v1.x1 = t2.x2 and v1.x1 > 10;
1-3) For the final processed query of Q1 in 1-2), build a query execution algorithm in Relational Algebra operators either in data pipelining steps (top to bottom) or a query execution tree (in a bottom up sequence) that will be built by the end of the Optimizer.

Answers: 1

Show answers

Another question on Computers and Technology

Computers and Technology, 23.06.2019 03:10

Fill in the following program so that it will correctly calculate the price of the orange juice the user is buying based on the buy one get one sale.#include //main functionint main() { int cartons; float price, total; //prompt user for input information printf("what is the cost of one container of oj in dollars? \n"); scanf(" [ select ] ["%d", "%c", "%f", "%lf"] ", & price); printf("how many containers are you buying? \n"); scanf(" [ select ] ["%d", "%c", "%f", "%lf"] ", & cartons); if ( [ select ] ["cartons / 2", "cartons % 1", "cartons % 2", "cartons % price", "cartons / price", "cartons / total"] [ select ] ["=", "==", "! =", "< =", "> =", "< "] 0) total = [ select ] ["price * cartons", "cartons * price / 2 + price", "(cartons / 2) * price", "cartons / (2.0 * price)", "(cartons / 2.0) * price + price", "((cartons / 2) * price) + price"] ; else total = ((cartons / 2) * price) + price; printf("the total cost is $%.2f.\n", total); return 0; }

Answers: 2

Answer

Computers and Technology, 23.06.2019 16:30

What is one reason why indoor air pollution has become an increasing problem.

Answers: 1

Answer

Computers and Technology, 23.06.2019 18:00

File account.java (see previous exercise) contains a definition for a simple bank account class with methods to withdraw, deposit, get the balance and account number, and return a string representation. note that the constructor for this class creates a random account number. save this class to your directory and study it to see how it works. then write the following additional code: 1. suppose the bank wants to keep track of how many accounts exist. a. declare a private static integer variable numaccounts to hold this value. like all instance and static variables, it will be initialized (to 0, since itâ€™s an int) automatically. b. add code to the constructor to increment this variable every time an account is created. c. add a static method getnumaccounts that returns the total number of accounts. think about why this method should be static - its information is not related to any particular account. d. file testaccounts1.java contains a simple program that creates the specified number of bank accounts then uses the getnumaccounts method to find how many accounts were created. save it to your directory, then use it to test your modified account class.

Answers: 3

Answer

Computers and Technology, 23.06.2019 18:30

List 3 items that were on kens resume that should have been excluded

Answers: 1

Answer

You know the right answer?

The design of a RDBMS architecture maintains a logical level (Conceptual view) and a physical level...

Questions