What is pipelining?A more efficient technique for reading a table from diskO The direct "streaming" in memory of the output of one operation (e.g. join) as the input of another operation(e.g. another join), without writing the output to diskO The process by which the query optimiser retrieves data from the catalog

Pipelining is a process of execution of operations in order simultaneously. Pipelining increases the…

Answered: What is pipelining? A more efficient…

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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What are the key differences between a clustered index and a sparse index?
How do data validation constraints apply to columns with XML data types in relational databases?
How is a clustered index constructed, and what features set it apart from a sparse index?
In a relational database, a select operation reduces the size of a table by removing columns that meet certain requirements.Is it accurate or inaccurate?
There are three tables in this database (see image). Write MYSQL code for: (1) Create a trigger “insert_inventory” on table “Inventory”. The trigger is fired after a row is inserted in table “Inventory”. After a row is inserted in table “inventory”, the “itemid”, the insertion time, and the action is inserted in table “Inventory_history”. The action is set to ‘add an item’. The oldprice is set to null. Test your trigger by inserting a row into Inventory and displaying the contents of Inventory_history. (2) Create a trigger “change_quantity” on table “Transaction”. The trigger is fired after a row is inserted in table “Transaction”. After a row is inserted in table “Transaction”, update the “quantity” in table “Inventory”. For example, if 3 iWatch are sold, then the quantity of iWatch in table “Inventory” is decreased by 3. Test your trigger by inserting a row into Transaction and displaying the contents of the relevant row in Inventory. (3) Create a trigger “change_price” on table…
What distinguishes a clustered index from a sparse index, and how do you make one?
Using the WideWorldDistributors database and the Sales schema create a function that takes InvoiceID as an input parameter and returns all the rows from the table InvoiceLines for the InvoiceID value passed into the function. If the result is a NULL return a zero
In order to demonstrate a single row function within a database, we employed a function referred to as "single row". Is the function scalar or vector-valued? Which option is superior?
The CVT Company is a leader in the manufacture of work clothes. You are hired as database administrator for the company and your IT supervisor asked you to solve a retrieval speed problem they used to have with a large file for item records. Your supervisor mentioned that they have sorted the file but the problem didn’t improve, so they need to create a B+ tree index to solve the problem. Your supervisor outlined the way to do it: “The best way to accomplish this task is to scan the file, record by record, inserting each one using the B+ tree insertion procedure.” Being a fresh graduate, you noticed that since the file is already sorted there is a better way to do it. What performance and storage utilization problems are there with your supervisor’s approach? Explain how the bulk-loading algorithm provides a better alternative than the proposed scheme.
The execution of a trigger can cause another action to be triggered. Most database systems place a limit on how deep the nesting can be. Explain why they might place such a limit.
7. A “natural join" in a relational database takes two tables of information and combines entries from the tables that share a particular field. You can read more about this at Wikipedia. Interpret the tables below as sets of sets? For the Course Enrollment Table define A = {{A38182818, Spring2021, Math230, 01}, ..., {A56363631, Spring2021, Math454, 01}}, and for the Student Table define B = {{Al, A81723653}, {Jo, A38182818}, {Su, A56363631}}. Course Enrollment Table Student Table A38182818 | Spring2021 | Math230 | 01 A81723653 | Spring2021 | Math350 01 Al A81723653 A81723653 Fall2020 Math152 04 Jo A56363631 A38182818 Fall2020 Math332 02 Su A38182818 A56363631 | Spring2021 Math454 | 01 (a) Construct the set C = {xUy : x € A, y E B, x N y # 0}. (b) Represent the resulting set C from part (a) as a table, similar to what you see above. Make sure to write down the table for C in a reasonably sorted order. (c) Why would you want to query the database for the set {x € C : Al e x}? Be…
Given the tables create table T (A int primary key, B int); create table U (C int primary key, A int, foreign key(A) references T(A) ); Table T contains 100 rows and table U contains 200 rows. A common mistake made by students is to do a join and assuming the database will supply the join predicate. A student does the query SELECT T.A, T.B, U.C FROM T, U; The student does not get an error message but gets a large result set. How many rows are in the result set?

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