'Fixed length' presentation slideshows

CS 232A: Database System Principles Notes 03: Disk Organization

CS 232A: Database System Principles Notes 03: Disk Organization. Topics for today. How to lay out data on disk How to move it to memory. What we have available: Bytes. 8 bits. What are the data items we want to store?. a salary a name a date a picture. To represent:.

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Fundamental File Structure Concepts

Fundamental File Structure Concepts. Chapter 4. Record and Field Structure. A record is a collection of fields . A field is used to store information about some attribute. The question: when we write records, how do we organize the fields in the records:

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CS551: Layering and Addressing

CS551: Layering and Addressing. Christos Papadopoulos ( http://netweb.usc.edu/cs551/). Protocols. Set of rules governing communication between network elements (applications, hosts, routers) Protocols define: Format and order of messages Actions taken on receipt of a message

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15-441 Computer Networking

15-441 Computer Networking. Lecture 7 – IP Addressing and Forwarding. Outline. Methods for packet forwarding Traditional IP addressing CIDR IP addressing Forwarding example. Techniques for Forwarding Packets. Source routing Packet carries path Table of virtual circuits

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Tonga Institute of Higher Education Design and Analysis of Algorithms

Tonga Institute of Higher Education Design and Analysis of Algorithms. IT 254 Lecture 5: Advanced Design Techniques. Advanced Design Techniques. Other methods of design, like divide-and-conquer and randomization, can usually be applied to many problems.

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Organizing Files for Performance

Organizing Files for Performance. Chapter 6 Jim Skon. Organizing Files for Performance. Data Compression Reclaiming space in files Fast Searching Keysorting. Data Compression. Making files smaller Use less storage, save space Faster Transmission Processed faster Data Compression

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CS 405G: Introduction to Database Systems

CS 405G: Introduction to Database Systems. 21 Storage Chen Qian University of Kentucky. Homeworks. 5 -> 4 To give you more time for the project. Review. Disk management Basic disk (physical) unit: page Basic DB unit: record (row of a table) How to connect page with record? File!.

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Storing Data: Disks and Files

Storing Data: Disks and Files. 11.1 Memory Hierarchy. Primary Storage : main memory. fast access, expensive. Secondary storage: hard disk. slower access, less expensive. Tertiary storage : tapes. slowest access, cheapest. 11.2 Disks. Characteristics of disks:

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Lecture 6: Greedy Algorithms I

Lecture 6: Greedy Algorithms I. Shang-Hua Teng. Optimization Problems. A problem that may have many feasible solutions. Each solution has a value In maximization problem , we wish to find a solution to maximize the value

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Huffman Codes

Huffman Codes. Encoding messages. Encode a message composed of a string of characters Codes used by computer systems ASCII uses 8 bits per character can encode 256 characters Unicode 16 bits per character can encode 65536 characters includes all characters encoded by ASCII

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Comp 335 File Structures

Comp 335 File Structures. Fundamental File Structure Concepts. File Organization. File Organization is how the data is organized in the file. Must be considered carefully how data is to be written to file because this will dictate how the data is to be read back in.

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U.S. East Coast Sea Level Acceleration: Recent Evidence from Tide Gauges

U.S. East Coast Sea Level Acceleration: Recent Evidence from Tide Gauges. John Boon Virginia Institute of Marine Science Gloucester Point, Virginia 23062. Sea Level Trends: GMSL vs. RMSL. Linear Trend : Trend estimate from a fitted mmsl* time series of fixed length N.

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Tuples vs. Records

Tuples vs. Records. In relational terms: Field = sequence of bytes representing the value of an attribute in a tuple. Record = sequence of bytes divided into fields, representing a tuple. File = collection of blocks used to hold a relation = set of tuples/records.

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Integers

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Objectives: To get familiar with: Data compression Storage management

Chapter 6 Organizing File for Performance. Objectives: To get familiar with: Data compression Storage management Internal sorting and binary search. Outline. Data compression Reclaiming space in files Record deletion Dynamic space reclaiming for fixed-length record

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Theory of Computation II

Theory of Computation II. Topic presented by: Alberto Aguilar Gonzalez. Problem. You are designing a banking application that will be accessed by thousands of users. Security of passwords is a key factor. Protect from people outside and inside the organization

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ONE WAY FUNCTIONS

ONE WAY FUNCTIONS. SECURITY PROTOCOLS CLASS PRESENTATION. INTRODUCTION. A One - Way function is a function which is easy to compute but difficult to invert. Two conditions for function f - Easy to compute - Difficult to invert. INTRODUCTION.

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File Processing

File Processing. Introduction. Files are used for permanent retention of large amount of data Storage of data in variables is temporary Files are stored on secondary storage devices Magnetic disks, optical disks, tapes. Data Hierarchy. Bit: manipulated by computer circuitry

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Mail Manager Full Service Complete mail-processing functionality in a single package

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ADAREORG

ADAREORG. Presented by Treehouse Software, Inc. ADAREORG. A utility for reorganizing the physical structure of compressed or decompressed ADABAS files, and flat files (or tables). Uses for ADAREORG. Respond to changing requirements Insert or delete fields anywhere, including PEs

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