Concordia University
Department of Computer Science and Software Engineering
COMP 6521 - Advanced Database Technology and Applications.
Fall 2014
Assignment 2. Due date: Monday October 13, by 23:59 p.m. EST
1. Suppose that we have a RAID level 6 scheme, a
Concordia University
Department of Computer Science and Software Engineering
COMP 6521 - Advanced Database Technology and Applications.
Fall 2015
Assignment 3. Solution
1. Exercise 15.4.4 from GMUW09
We have two relations R = (X, Y ) and S = (Y, Z). Also
Concordia University
Department of Computer Science and Software Engineering
COMP 6521 - Advanced Database Technology and Applications.
Fall 2014
Project 2. Due date: Wednesday, November 19, by 12:00 p.m. EST
Three-Way Joins: Given three relations R(A, B)
Concordia University
Department of Computer Science and Software Engineering
COMP 6521 - Advanced Database Technology and Applications
Fall 2014
Midterm Exam October 15
Grading: Each of the four questions is worth a maximum of 3 points.
1. Let R be a rela
Database System Implementation
Solutions for Chapter 8
Solutions for Section 8.1
Solutions for Section 8.2
Solutions for Section 8.3
Solutions for Section 8.4
Solutions for Section 8.5
Return to Top
Solutions for Section 8.1
Exercise 8.1.1(a)
Let a and b
External Memory Hashing
Hash Tables
Hash function h: search key
[0B-1].
Buckets are blocks,
numbered [0B-1].
Big idea: If a record with
search key K exists, then it
must be in bucket h(K).
One disk I/O if there is
only one block per bucket.
Hash-Tabl
Database System Implementation
Solutions for Chapter 6
Solutions for Section 6.1
Solutions for Section 6.3
Solutions for Section 6.4
Solutions for Section 6.5
Solutions for Section 6.6
Solutions for Section 6.7
Solutions for Section 6.8
Solutions for Sect
Concordia University
Department of Computer Science and Software Engineering
COMP 6521 - Advanced Database Technology and Applications.
Fall 2013
Assignment 3. Due date: Friday November 8, by 23:59 p.m. EST
1. Consider a market-basket dataset where there
Concordia University
Department of Computer Science and Software Engineering
COMP 6521 Advanced Database Technology and Applications.
Fall 2013
Assignment 3. Solutions
Question 1:
a) The frequency of item n is: 100/n . Since the support thresho
AdvanceDatabaseSystemsandApplication
Comp6521
Group7
Professor:Dr.GostaGrahne
LabInstructor:AshkanAzarnik
TeamMembers
AzadehHomayounpour
Rameez
Develop a program to read the records from File and
sort them in ascending order using 2 Phase Multiway
Merge S
Concordia University
Department of Computer Science and Software Engineering
COMP 6521 - Advanced Database Technology and Applications.
Fall 2014
Assignment 1. Solution
1. (4.5)
FCOU N T (title) (title (director= Bergman (M ovies) title (P airscope)
or
FC
Concordia University
Department of Computer Science and Software Engineering
COMP 6521 - Advanced Database Technology and Applications.
Fall 2014
Assignment 3. Due date: Friday November 28, by 23:59 p.m. EST
1. Consider relations R(X, Y ) and S(Y, Z), wit
1. 2PMMS
(a) Short statement of the problem.
(b) Design principles: datastructures, some algorithm (part), I/O
(c) Buer size: experiments and conlusions.
(d) Results from demo.
2. FIM
(a) Short statement of the problem.
(b) Overview of algorithms consider
Concordia University
Department of Computer Science and Software Engineering
COMP 6521 - Advanced Database Technology and Applications.
Fall 2013
Assignment 4. Due date: Sunday November 24, by 23:59 p.m. EST
1. Textbook GMUW09, exercise 16.4.1
2. Textbook
Concordia University
Department of Computer Science and Software Engineering
COMP 6521 Advanced Database Technology and Applications.
Fall 2013
Assignment 1. Solutions
Question 1:
Consider the block size 4Kb = 8 sectors
If we consider that 1 blo
Concordia University
Department of Computer Science and Software Engineering
COMP 6521 Advanced Database Technology and Applications.
Fall 2013
Assignment 4. Solutions
Question 1: GMUW09 (16.4.1)
a) Start by taking the product of the sizes of the
COMP 6521Advanced Database Technology and Applications
Assignment 2
Due on Wednesday February 27, 2013
Please submit a HARD COPY of your solution, and please TYPE, if possible.
1. [10] Points] Suppose we have a sequential but ordered le F of 100,000 recor
Concordia University
Department of Computer Science and Software Engineering
COMP 6521 - Advanced Database Technology and Applications.
Fall 2013
Assignment 2. Due date: Sunday October 13, by 23:59 p.m. EST
1. Suppose that we have a RAID level 6 scheme, a
20
Chapter 2
MapReduce and the New
Software Stack
Modern data-mining applications, often called big-data analysis, require us
to manage immense amounts of data quickly. In many of these applications, the
data is extremely regular, and there is ample oppor
Improvements to A-Priori
Park-Chen-Yu Algorithm
Multistage Algorithm
1
Slide based on www.mmds.org
PCY Algorithm
During Pass 1 of A-priori, most memory is idle.
Use that memory to keep counts of buckets into
which the pairs of items are hashed.
Just th
Index-Based Algorithms
Notions of clustering
Clustered relation: tuples are stored in blocks mostly
devoted to that relation.
Clustering index: tuples (of the relation) with same
search key are stored together.
Index-based algorithms:
selection
To eval
Serializability via timestamps
Main idea: let things rumble along without any locking or
scheduling (be optimistic).
(By contrast 2PL is pessimistic)
As transactions read/write, check that what they are doing
makes sense if the serial order was the same
Concurrency control
In production environments, it is unlikely that we can
limit our system to just one user at a time.
Consequently, it is possible for multiple queries or
transactions to be submitted at approximately the same
time.
If all of the quer
Frequent-Itemset Mining
Frequent-Itemset Mining
Market-Basket Model
A large set of items, e.g., things sold in a supermarket.
A large set of baskets, each of which is a small set of the
items, e.g., the things one customer buys on one day.
Fundamental p
SQL
Group Members:
Shijun Shen
Xia Tang
Sixin Qiang
Relational Model
Very simple model.
It is the Abstract model that underlies SQL.
By using the relational approach, the logic
representation(the program) is separated from the
physical implementation of t
Frequent Itemset Mining:
Computation Model
Typically, data is kept in a flat
file rather than a database
system.
Stored on disk.
Stored basket-by-basket.
The true cost of mining diskresident data is usually the
number of disk I/Os.
In practice, assoc