Primary database

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  • After completing this lesson, you should be able to do the following: Describe the factors that affect planned and unplanned downtime Describe the basic components of Oracle Data Guard Explain the differences between physical and logical standby databases Explain the benefits of creating a Data Guard environment Explain the use of Data Guard in high-availability architectures

    ppt20p nghianguyenluong 30-06-2009 264 91   Download

  • The purpose of this manual is to give guidance on how to use the eighth edition of the book An Introduction to Database Systems──referred to throughout the manual as simply "the book," or "this book," or "the present book," or just "the eighth edition"──as a basis for teaching a database course. The book is suitable for a primary (one- or two-semester) course at the junior or senior undergraduate or first-year graduate level; it also contains some more forward-looking and research-oriented material that would be relevant to a more advanced course....

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  • Issues Involved When Updating the Primary Key of a Parent Row In this section, you'll learn about the issues involved when attempting to update the primary key in a parent DataTable

    pdf6p daisuphu 29-07-2010 61 8   Download

  • This document describes the features of Oracle Database for Windows software installed on Windows NT Server, Windows 2000, Windows XP Professional, and Windows Server 2003 operating systems. This guide is your primary source of introductory and reference information for Oracle Database for Windows for both client and server. Differences between product versions are noted where appropriate.

    pdf270p daokim 03-08-2009 53 6   Download

  • [ Team LiB ] Recipe 6.9 Retrieving Constraints from a SQL Server Database Problem You need to programmatically define constraints in a DataSet and retrieve constraint information defined in a SQL Server database. Solution Use the INFORMATION_SCHEMA views and SQL Server system tables to get information about primary keys, foreign keys, and check constraints.

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  • The best practices described in this paper require that the Data Guard configuration be managed by the Data Guard Broker9. The Data Guard Broker is responsible for sending FAN events to client applications in order to clean up their connections to the down database and reconnect to the new production database. In addition, Oracle Clusterware must be installed and active on the primary and standby sites for both single instance (using Oracle Restart) and Oracle RAC databases.

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  • Our infrastructure (Akash1 ) consists of a virtual storage system prototype designed to run on commodity hard- ware. It supports data accesses to multiple virtual vol- umes for any storage client, such as, database servers and file systems. It uses the Network Block Device (NBD) driver packaged with Linux to read and write log- ical blocks from the virtual storage system, as shown in Figure 3. NBD is a standard storage access proto- col similar to iSCSI, supported by Linux. It provides a method to communicate with a storage server over the network.

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  • Database Management Systems: Chapter 2 - Indexing Structures for Files present about Types of Single-level Ordered Indexes (Primary Indexes, Clustering Indexes, Secondary Indexes); Multilevel Indexes; Dynamic Multilevel Indexes Using B-Trees and B+-Trees; Indexes on Multiple Keys.

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  • For each weak entity type W in the ER schema with owner entity type E, create a relation R and include all simple attributes (or simple components of composite attributes) of W as attributes of R. In addition, include as foreign key attributes of R the primary key attribute(s) of the relation(s) that correspond to the owner entity type(s). The primary key of R is the combination of the primary key(s) of the owner(s) and the partial key of the weak entity type W, if any.

    ppt32p thienthanoze 12-11-2012 29 2   Download

  • GUIDELINE 3: Relations should be designed such that their tuples will have as few NULL values as possible  Attributes that are NULL frequently could be placed in separate relations (with the primary key)  Reasons for nulls: attribute not applicable or invalid attribute value unknown (may exist) value known to exist, but unavailable

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  • A sequence: Automatically generates unique numbers Is a sharable object Is typically used to create a primary key value Replaces application code Speeds up the efficiency of accessing sequence values when cached in memory

    ppt28p trinh02 28-01-2013 22 2   Download

  • This paper discusses the structure and components of databases for real-world e-commerce systems. We first present an integrated 8-process value chain needed by the e-commerce system and its associated data in each stage of the value chain. We then discuss logical components of a typical e-commerce database system. Finally, we illustrate a detailed design of an e-commerce transaction processing system and comment on a few design considerations specific to e-commerce database systems, such as the primary key, foreign key, outer join, use of weak entity, and schema partition.

    pdf6p thubvn 06-05-2013 30 2   Download

  • In this chapter you will: To understand how firms create an internal database, to learn about building a database from a Web site, to become familiar data mining, to understand the advantages and disadvantages of of using secondary data, to understand the role of the Internet in obtaining secondary data, to learn about types of information management systems.

    ppt13p allbymyself_06 28-01-2016 8 2   Download

  • Database System: Chapter 8 - Normalization for Relational Databases includes Normal Forms Based on Primary Keys (Normalization of Relations, Practical Use of Normal Forms, Definitions of Keys and Attributes Participating in Keys,...), General Normal Form Definitions (For Multiple Keys), BCNF (Boyce-Codd Normal Form).

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  • Chapter 10 present functional dependencies and normalization for relational databases. This chapter includes contents: Informal design guidelines for relational databases, functional dependencies (FDs), normal forms based on primary keys, general normal form definitions (For Multiple Keys), BCNF (Boyce-Codd Normal Form).

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  • Chapter 10 present functional dependencies and normalization for relational databases. This chapter includes contents: Informal design guidelines for relational databases, functional dependencies (FDs), normal forms based on primary keys, general normal form definitions (For Multiple Keys), BCNF (Boyce-Codd Normal Form).

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  • Chapter 16 - Recovery system. This chapter covers the primary techniques for ensuring correct transaction execution despite system crashes and storage failures. These techniques include logs, checkpoints, and database dumps. The widely-used ARIES algorithm is presented.

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  • This document is your primary source of introductory, installation, postinstallation configuration, and usage information for Oracle Data Provider for .NET. Oracle Data Provider for .NET is an implementation of the Microsoft ADO.NET interface. This document describes the features of Oracle Database for Windows that apply to the Windows NT Server, Windows 2000, Windows XP, and Windows Server 2003 operating systems.

    pdf1162p daokim 03-08-2009 197 72   Download

  • Mike Young is the co-founder of Softouch Inc. Mike has spent the last several years teaching, consulting, and developing training materials about Microsoft products. Mike has spent the majority of his time over the years supporting and consulting about Microsoft SQL Server. He has a background in database administration and is concerned that his clients meet their expectations for the product. Mike’s primary areas of expertise are Data Transformation Services (DTS), Analysis Server, and all areas related to security. Curtis W. Young is the other co-founder of Softouch Inc....

    pdf466p suthebeo 17-07-2012 38 12   Download

  • Storage devices hold data, even when the computer is turned off. The physical material that actually holds data is called a storage medium. The surface of a floppy disk is a storage medium. The hardware that writes data to or reads data from a storage medium is called a storage device. A floppy disk drive is a storage device. The two primary storage technologies are magnetic and optical.

    ppt28p trada85 18-01-2013 36 9   Download

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