database - Stefano Grazioli
... Why do we need Databases? Program (e.g., VBA) data is volatile Data in one place for everyone to use Indispensable in commerce ...
... Why do we need Databases? Program (e.g., VBA) data is volatile Data in one place for everyone to use Indispensable in commerce ...
Chapter 12
... • A two-table database has parent and child tables • Foreign key: links child record to parent record Programming with Microsoft Visual Basic 2005, Third Edition ...
... • A two-table database has parent and child tables • Foreign key: links child record to parent record Programming with Microsoft Visual Basic 2005, Third Edition ...
) DATABASE DESIGN (H4
... Question A1 The first stage in creating a Data Warehouse is Extraction. Describe this extraction process including some of the potential problems that need to be addressed. (5 marks) Question A2 Explain the term Fragmentation Transparency in the context of a Distributed ...
... Question A1 The first stage in creating a Data Warehouse is Extraction. Describe this extraction process including some of the potential problems that need to be addressed. (5 marks) Question A2 Explain the term Fragmentation Transparency in the context of a Distributed ...
Rethinking Cost and Performance of Database Systems
... cheaper, like anything else. Finally, the DB software itself can be a cost factor: Most of the functionality is not needed by an application so that clients are forced to pay for unneeded features. This situation is improving with open source database systems such as PostGres and MySQL; nevertheless ...
... cheaper, like anything else. Finally, the DB software itself can be a cost factor: Most of the functionality is not needed by an application so that clients are forced to pay for unneeded features. This situation is improving with open source database systems such as PostGres and MySQL; nevertheless ...
Module 1: Introduction
... Let r1(R1) and r2(R2) be relations with primary keys K1 and K2 respectively. The subset of R2 is a foreign key referencing K1 in relation r1, if for every tuple t2 in r2 there must be a tuple t1 in r1 such that t1[K1] = t2[]. Referential integrity constraint also called subset dependency since it ...
... Let r1(R1) and r2(R2) be relations with primary keys K1 and K2 respectively. The subset of R2 is a foreign key referencing K1 in relation r1, if for every tuple t2 in r2 there must be a tuple t1 in r1 such that t1[K1] = t2[]. Referential integrity constraint also called subset dependency since it ...
第11 章
... DBMS Architecture (continued) • Input/output request: low-level data access operation to/from computer devices, such as memory, hard disks, videos, and printers • Data cache is faster than data in data files – DBMS does not wait for hard disk to retrieve data ...
... DBMS Architecture (continued) • Input/output request: low-level data access operation to/from computer devices, such as memory, hard disks, videos, and printers • Data cache is faster than data in data files – DBMS does not wait for hard disk to retrieve data ...
Set 1 - Introduction
... of or susceptible to change system generated, not derived from values or methods allows shared substructures an object can undergo great changes without changing its identity should allow comparisons based on OID in the query language ...
... of or susceptible to change system generated, not derived from values or methods allows shared substructures an object can undergo great changes without changing its identity should allow comparisons based on OID in the query language ...
Databases and Database Management Systems
... identifies a record • Student ID is a number allocated to each student as there may be 2 students with the same name ...
... identifies a record • Student ID is a number allocated to each student as there may be 2 students with the same name ...
8. managing data resources - College of Business Administration
... stored in files and the specific programs required to update and maintain those files • Lack of flexibility: traditional file systems can deliver routine scheduled reports, but cannot deliver ad-hoc reports or respond to unanticipated requirements. ...
... stored in files and the specific programs required to update and maintain those files • Lack of flexibility: traditional file systems can deliver routine scheduled reports, but cannot deliver ad-hoc reports or respond to unanticipated requirements. ...
Organization03
... OLAP/data warehouse transparencies to be used for COSC 6340; other more detailed collections include: Hector Garcia-Molina's Data Warehouse and OLAP transparencies, Raghu's OLAP/dataware house transparencies and Han/Kamber's OLAP/data warehouse transparencies. An "easy down-to earth" example of buil ...
... OLAP/data warehouse transparencies to be used for COSC 6340; other more detailed collections include: Hector Garcia-Molina's Data Warehouse and OLAP transparencies, Raghu's OLAP/dataware house transparencies and Han/Kamber's OLAP/data warehouse transparencies. An "easy down-to earth" example of buil ...
JAZZ GILL Internet Developer/ Programmer www.jasvindergill.co.uk
... I was employed for a recruitment company as a Senior Software Developer on a fixed term contract with added responsibility of a Network System Administrator. Six month fixed contract assignment extended to 1 year. Senior developer/ lead - online recruitment customised software serving the Aerospace, ...
... I was employed for a recruitment company as a Senior Software Developer on a fixed term contract with added responsibility of a Network System Administrator. Six month fixed contract assignment extended to 1 year. Senior developer/ lead - online recruitment customised software serving the Aerospace, ...
fragments
... The division of a relation into subsets by attributes (column) Each subset is stored at a different node, and each fragment has unique columns – with the exception of the key column, which is common to all fragments Transaction issues here because same record may need to be inserted into two tables ...
... The division of a relation into subsets by attributes (column) Each subset is stored at a different node, and each fragment has unique columns – with the exception of the key column, which is common to all fragments Transaction issues here because same record may need to be inserted into two tables ...
Database Design 2008 - Session 1
... these files can all be opened directly in Access 2007. Access 2007 introduced a couple of new features, and drastically revamped the user interface. 1. Specific features that are new for later versions of Access will not be available if you are working with a database from an earlier version. In gen ...
... these files can all be opened directly in Access 2007. Access 2007 introduced a couple of new features, and drastically revamped the user interface. 1. Specific features that are new for later versions of Access will not be available if you are working with a database from an earlier version. In gen ...
PL/SQL Enhancements in Oracle Database 11g
... • Two data managers for one application is one too many • The application must patch over the gap • This split compromises security, robustness, and management ...
... • Two data managers for one application is one too many • The application must patch over the gap • This split compromises security, robustness, and management ...
Distributed Databases
... Distributed Databases 22. Features of distributed versus centralized database: A Distributed databases are present different features from traditional (centralized system ) so that it is useful to look at the typical features of traditional database and compare them with the features of distributed ...
... Distributed Databases 22. Features of distributed versus centralized database: A Distributed databases are present different features from traditional (centralized system ) so that it is useful to look at the typical features of traditional database and compare them with the features of distributed ...
pstmt.setInt(1, 100)
... – If accessing the database is a small part of a large Java application – Etc. • Why not keep all the data in Java objects? • “Separation of concerns”: DBMSes concentrate on data storage and access; programs concentrate on algorithms, networking, etc. ...
... – If accessing the database is a small part of a large Java application – Etc. • Why not keep all the data in Java objects? • “Separation of concerns”: DBMSes concentrate on data storage and access; programs concentrate on algorithms, networking, etc. ...
PowerPoint ******
... • The indexes in IMDBs are focused on reduced memory consumption and CPU cycles. • In the early 90's, Lehman and Carey proposed the T-tree as an index structure for main memory database. • The T-tree indexes are more efficient than B-trees in that they require less memory space and fewer CPU cycles. ...
... • The indexes in IMDBs are focused on reduced memory consumption and CPU cycles. • In the early 90's, Lehman and Carey proposed the T-tree as an index structure for main memory database. • The T-tree indexes are more efficient than B-trees in that they require less memory space and fewer CPU cycles. ...
How to Back Up and Restore a Dynamics NAV 2015 Database
... However, in order for the following instructions to work, it is necessary to have a separate NAV Server Instance dedicated to the testing database/environment. The testing environment's NAV Server Instance needs to be configured properly, and you'll need to know a few of its specific configurations ...
... However, in order for the following instructions to work, it is necessary to have a separate NAV Server Instance dedicated to the testing database/environment. The testing environment's NAV Server Instance needs to be configured properly, and you'll need to know a few of its specific configurations ...
GoFforRelDB - Computer Science Home
... Allow an object to alter its behavior when its internal state changes. The object will appear to change its class “What-if” analysis (with Strategy and Command) Support optimization of selection among multiple implementation for join and temporary files, particularly in stored queries and view ...
... Allow an object to alter its behavior when its internal state changes. The object will appear to change its class “What-if” analysis (with Strategy and Command) Support optimization of selection among multiple implementation for join and temporary files, particularly in stored queries and view ...
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"".