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Chapter 1
Chapter 1

... more than an organized collection of records, or rows, that all have the same attributes, or columns. Figure 1-1 illustrates atypical CUSTOMERS table in a relational database. Notice that each customer record in the example CUSTOMERS table has the same attributes, including an ID, a company name, a ...
Databases - Course Introduction
Databases - Course Introduction

... Non-Clustered Indexes  Useful for fast retrieving a single record or a range of records  Maintained in a separate structure in the DB  Tend to be much narrower than the base table  Can locate the exact record(s) with less I/O ...
Database System Architectures
Database System Architectures

... Implementation Issues for Distributed Databases  Atomicity needed even for transactions that update data at multiple sites  The two-phase commit protocol (2PC) is used to ensure atomicity ...
1. e1 -> e2: If e1 occurs, then e2 must also occur. There is no implied
1. e1 -> e2: If e1 occurs, then e2 must also occur. There is no implied

... environments, it may not be possible, or desirable, to maintain the ACID properties of a traditional transaction, which require using a protocol such as the two-phase commit protocol [4]. Furthermore, the inter-resource dependencies, consistency requirements, and contingency strategies for the enter ...
Slides from Lecture 1 - Courses - University of California, Berkeley
Slides from Lecture 1 - Courses - University of California, Berkeley

... – AKA Data Dictionary – The place where all metadata for a particular database is stored – may also include information on relationships between files or tables in a particular database ...
slides (6pp)
slides (6pp)

... ”WHERE code = course ” + ”ORDER BY code, period”); Compare with previous row to see if this is a new course. String currentCourse, course; If it is, print its name. while (rs.next()) { course = rs.getString(1); if (!course.equals(currentCourse)) System.out.println(rs.getString(2)); System.out.printl ...
Chapter 1
Chapter 1

... the database data. The data of logical database structures, such as tables and indexes, is physically stored in the datafiles allocated for a database. The characteristics of datafiles are: – A datafile can be associated with only one database. – Datafiles can have certain characteristics set to let ...
SQL Server Performance Methodology with Oracle
SQL Server Performance Methodology with Oracle

... • Memory Architecture: 32 bit vs. 64 bit – Not going to solve problems, maybe mask them. ...
defurio_reveiwmarkup.pdf
defurio_reveiwmarkup.pdf

... The Acrobat Database Connectivity (ADBC) plug-in provides some basic JavaScript properties and methods for connecting to a database. These can be used to obtain information about the databases available on the system, the tables contained within each database and the data types used within any given ...
SQL Server Basics for Non-DBAs
SQL Server Basics for Non-DBAs

... • Transact-SQL Code can run under a specific execution context – By default, will execute as the caller ...
multi-dimensional views of data
multi-dimensional views of data

... • A series of numbers representing a particular variable over time is called a time series e.g.. 52 weekly sales numbers is a time series. • Utilising a time-series data type allows you to store an entire string of numbers representing daily, weekly or monthly data. • Thus an OLAP server that suppor ...
Creating Tables
Creating Tables

... This has introduced the basic data types that will be used in the Yum Juices database that you create during this module You can find more information about data types in the MySQL Reference Manual ...
CS 412 Study Guidelines for the Midterm Exam
CS 412 Study Guidelines for the Midterm Exam

...  Defining and implementing the remote interface  Defining and implementing the client  Compile, code placement and execution  Problems that we may face while trying to compile and execute a RMI based program. Including the problems we faced (or I explained) in the lab and how we solve them.  Yo ...
Flashback Transaction Query
Flashback Transaction Query

... Provides a way to audit the rows of a table and retrieve information about the transactions that changed the rows. Retrieve all committed versions of the rows that exist or ever existed between the time the query was issued and a point in time in the past Use the transaction ID to perform transactio ...
Slides from Lecture 15 - Courses - University of California, Berkeley
Slides from Lecture 15 - Courses - University of California, Berkeley

... • The goal is to support access by multiple users to the same data, at the same time • It must assure that the transactions are serializable and that they are isolated • It is intended to handle several problems in an uncontrolled system • Specifically: – Lost updates – Inconsistent data states duri ...
Chapter 1 Information Technology: Principles, Practices, and
Chapter 1 Information Technology: Principles, Practices, and

... problem’s characteristics and how database creating and processing can assist in solving the problems. ...
Introduction to Database Management - gozips.uakron.edu
Introduction to Database Management - gozips.uakron.edu

... E. F. Codd of IBM originated the relational model approach in the 1970s Has been the predominant method for data storage The central data description construct is a table (called “relation” by Dr. Codd) Relation (entity) - a set of records, with the same number and type of fields Some relational DBM ...
SQL Server in-memory
SQL Server in-memory

Document
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... Relational Database Operators  PROJECT produces a list of all values for selected attributes. It yields a vertical subset of a table. ...
Database Concepts - Information Systems
Database Concepts - Information Systems

... data presented in a meaningful context, where we may have applied some form of processing to the data, such as computing averages, sorting, grouping, etc. • Databases record data, but they do so in such a way that we can produce information from the data – The data on STUDENTs, CLASSes and GRADEs co ...
Unit-1
Unit-1

... Physical Data Independence: The capacity to change the internal schema without having to change the conceptual schema. For example, the internal schema may be changed when certai ...
What is a Transaction - a.thanop somprasong (ning)
What is a Transaction - a.thanop somprasong (ning)

...  What concurrency control is and what role it plays in maintaining the database’s integrity  What locking methods are and how they work  How stamping methods are used for concurrency control  How optimistic methods are used for concurrency control  How database recovery management is used to ma ...
document
document

... • SWISS-PROT is a curated protein sequence database which strives to provide a high level of annotations (such as the description of the function of a protein, its domains structure, post-translational modifications, variants, etc.), a minimal level of redundancy and high level of integration with o ...
Visual Basic 6 Database Programming Bible
Visual Basic 6 Database Programming Bible

Databases and Database Users
Databases and Database Users

...  Insulation between programs and data, and data abstraction  Support of multiple views of the data  Sharing of data and multiuser transaction processing ...
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Microsoft Jet Database Engine



The Microsoft Jet Database Engine is a database engine on which several Microsoft products have been built. A database engine is the underlying component of a database, a collection of information stored on a computer in a systematic way. The first version of Jet was developed in 1992, consisting of three modules which could be used to manipulate a database.Database connect for MicrosoftJET stands for Joint Engine Technology, sometimes being referred to as Microsoft JET Engine or simply Jet. Microsoft Access and Visual Basic use or have used Jet as their underlying database engine. It has since been superseded for general use, however, first by Microsoft Desktop Engine (MSDE), then later by SQL Server Express. For larger database needs, Jet databases can be upgraded (or, in Microsoft parlance, ""up-sized"") to Microsoft's flagship database product, SQL Server.However, this does not mean that a MS Jet (Red) database cannot match MS SQL Server in storage capacity. A 5 billion record MS Jet (Red) database with compression and encryption turned on requires about 1 terabyte of disk storage space, comprising hundreds of (*.mdb) files, each acting as partial table, and not as a database in itself.Over the years, Jet has become almost synonymous with Microsoft Access, to the extent that many people refer to a Jet database as an ""Access database"".
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