and Review RDBMS review Memory hierarchy John Edgar 2 1.1 A table consists of rows and columns ▪ Rows represent records ▪ Records must be unique ▪ One or more attributes forms a primary key ▪ Records are also referred to as tuples ▪ Each column represents an attribute ▪ Columns must […]
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Query Optimization 1 Parsing Queries Relational algebra review Relational algebra equivalencies Estimating relation size Cost based plan selection Join order John Edgar 2 Generating equivalent logical plans and their physical plans is known as query optimization Selecting a good query plan entails decisions ▪ Which equivalent plan?
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• Introduction In this assignment, you are required to develop an Android Application to play a Numerical Reasoning IQ Test by downloading the questions from a server and then request player to solve them. This app will also record the result and corresponding time required to complete a game and use charts to show the
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CMPT 454 A traditional database requires both persistent and working (transient) memory ▪ The data is stored in non-volatile secondary storage to reduce the risk of data loss ▪ Hard Disk Drive (HDD) or Solid State Drive (SSD) ▪ Data is transferred from disk to main memory ▪ Where operations (read, update, write, …)
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Introduction to Indexes File organizations Introduction to indexes Consider a simple SQL query Assume data is stored on HDD to make access table efficient ▪ Store the table on adjacent blocks ▪ On the same cylinder, then ▪ Adjacent cylinders ▪ Use RAID But many queries include WHERE clauses ▪
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Skiplists, Bitmap Indices, kd Trees Skiplist Bitmap Indexes kd Trees 5.1 B and B+ trees are the most commonly used ordered DBMS index structure ▪ Tree nodes are mapped to disk pages In-memory DBs allows the use of other index structures ▪ That do not have to be optimized for
Record and Page Format Files John Edgar 2 4.1 A database is made up of tables ▪ A table is generally represented by a single file Tables are collections of records ▪ A record describes an entity or relationship ▪ And is defined by its attribute values Attributes also referred
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And SSDs Buffer management Solid State Drives John Edgar 2 5.1 Main memory is partitioned into a collection of frames called the buffer pool ▪ The buffer manager is responsible for bringing pages from disk to main memory as required ▪ Pages are mapped to frames ▪ Processes inform the buffer manager
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Carnegie Mellon Bryant and O’Hallaron, Computer Systems: A Programmer’s Perspective, Third Edition 1 Carnegie Mellon Course Overview 15-213/18-213/15-513: Introduction to Computer Systems 1st Lecture, May 19, 2020 Instructors: Brian Railing The course that gives CMU its “Zip”! Bryant and O’Hallaron, Computer Systems: A Programmer’s Perspective, Third Edition 2 Carnegie Mellon Overview Big Picture ▪
Chapman & Hall/CRC CRYPTOGRAPHY AND NETWORK SECURITY INTRODUCTION TO MODERN CRYPTOGRAPHY Second Edition Jonathan Katz Yehuda Lindell INTRODUCTION TO MODERN CRYPTOGRAPHY Second Edition CHAPMAN & HALL/CRC CRYPTOGRAPHY AND NETWORK SECURITY Published Titles Series Editor Douglas R. Stinson Lidong Chen and Guang Gong, Communication System Security Shiu-Kai Chin and Susan Older, Access Control, Security, and Trust: