Slides (powerpoint)
... Data translation [Popa et al] Data integration [Spaccapietra & Parent] Meta meta models [Noy et al] Properties of mappings [Hull] ...
... Data translation [Popa et al] Data integration [Spaccapietra & Parent] Meta meta models [Noy et al] Properties of mappings [Hull] ...
Reliability and Security in Database Servers
... When failure occurs DB admin must first copy the damaged file from best backup. Recover command prompts for each redo log that must be run. Oracle has both “hot” and “cold” backups. Hot backup when in use, cold backup - when database is unavailable to users ...
... When failure occurs DB admin must first copy the damaged file from best backup. Recover command prompts for each redo log that must be run. Oracle has both “hot” and “cold” backups. Hot backup when in use, cold backup - when database is unavailable to users ...
PPT
... Problems with files: – redundancy—number of files grows with applications, and data is duplicated – inconsistency—data is updated in one application’s files, but not in another’s – maintenance problems—changes to data structures mean changes to many programs – difficulty combining data—business need ...
... Problems with files: – redundancy—number of files grows with applications, and data is duplicated – inconsistency—data is updated in one application’s files, but not in another’s – maintenance problems—changes to data structures mean changes to many programs – difficulty combining data—business need ...
Creating a Database
... enables the data needs of each system to be defined in a logical manner, its weakness is the difficulty of linking the data from one problem to another IS cannot easily share data if they are ...
... enables the data needs of each system to be defined in a logical manner, its weakness is the difficulty of linking the data from one problem to another IS cannot easily share data if they are ...
Presentation
... -uses java object/relational mapping solution Hibernate to cache datasets from the MDSPlus so that the researchers can get the datasets quickly ...
... -uses java object/relational mapping solution Hibernate to cache datasets from the MDSPlus so that the researchers can get the datasets quickly ...
DataMart
... A set of data elements (values) that are organized using a model of vertical columns (identified by name) and horizontal rows. ...
... A set of data elements (values) that are organized using a model of vertical columns (identified by name) and horizontal rows. ...
No Slide Title
... • XPath and XQuery share a common data model • Query data model considers an XML document as a tree over: a d-node, e-nodes, a-nodes, c-nodes, tnodes, i-nodes, and n-nodes • Nodes have identifiers, where an owner node has smaller identifier value than its children, and that gives raise to the notion ...
... • XPath and XQuery share a common data model • Query data model considers an XML document as a tree over: a d-node, e-nodes, a-nodes, c-nodes, tnodes, i-nodes, and n-nodes • Nodes have identifiers, where an owner node has smaller identifier value than its children, and that gives raise to the notion ...
slides (6pp)
... Statement myStmt = myCon.createStatement(); ResultSet rs = myStmt.executeQuery( ”SELECT code, name, period, teacher ” + ”FROM Courses, GivenCourses ” + ”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, ...
... Statement myStmt = myCon.createStatement(); ResultSet rs = myStmt.executeQuery( ”SELECT code, name, period, teacher ” + ”FROM Courses, GivenCourses ” + ”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, ...
Database Management
... Web Database A Web database usually resides on a database server, which is a computer that stores and provides access to a database. One type of program that manages the sending and receiving of data between the front end and the database server is a CGI ...
... Web Database A Web database usually resides on a database server, which is a computer that stores and provides access to a database. One type of program that manages the sending and receiving of data between the front end and the database server is a CGI ...
Representing Entity Sets as Tables
... deriving a relational database design from an E-R diagram. Primary keys allow entity sets and relationship sets to be ...
... deriving a relational database design from an E-R diagram. Primary keys allow entity sets and relationship sets to be ...
Database Management Systems - The Institute of Finance
... Separate languages associated with the model are used to express database queries and updates. The three most widely-accepted models are the relational, network, and hierarchical. This course will concentrate on the relational model. The network and hierarchical models are covered in appendices in t ...
... Separate languages associated with the model are used to express database queries and updates. The three most widely-accepted models are the relational, network, and hierarchical. This course will concentrate on the relational model. The network and hierarchical models are covered in appendices in t ...
Database Approach - Dr. Hong-Mei Chen
... • Relationships are just as important as entities— they are data that need to be stored in the DB • Most relationships are binary, but they may be ternary (or more!) as well • Questions: – What is the relationship between three binary relationships and a ternary relationship? – Why are there two rel ...
... • Relationships are just as important as entities— they are data that need to be stored in the DB • Most relationships are binary, but they may be ternary (or more!) as well • Questions: – What is the relationship between three binary relationships and a ternary relationship? – Why are there two rel ...
INFS 6225 – Object-Oriented Systems Analysis & Design
... Eliminate redundancy of data (or else wasted space & processing occurs) Ensure data integrity (or else data anomalies) Ensure that changes in data (modifications, deletions, etc. only have to happen in one place) ...
... Eliminate redundancy of data (or else wasted space & processing occurs) Ensure data integrity (or else data anomalies) Ensure that changes in data (modifications, deletions, etc. only have to happen in one place) ...
INSS 651
... .DIRECT .ad-hoc mode .query .INDIRECT .through application programs .embedded in host languages EU OPERATIONS: .ADD .DELETE .MODIFY .RETRIEVE ...
... .DIRECT .ad-hoc mode .query .INDIRECT .through application programs .embedded in host languages EU OPERATIONS: .ADD .DELETE .MODIFY .RETRIEVE ...
Data Models - VUB STARLab
... Instance (population) – the actual content of the database at a particular ...
... Instance (population) – the actual content of the database at a particular ...
How to
... at JHU with Alex, Tamas and Wil to set up a SkyNode for GALEX (http://galex.stsci.edu). The implementation was rather easy, and we decided it would be a good idea to document the steps we undertook for others to follow. ...
... at JHU with Alex, Tamas and Wil to set up a SkyNode for GALEX (http://galex.stsci.edu). The implementation was rather easy, and we decided it would be a good idea to document the steps we undertook for others to follow. ...
Project Definition: DSS Database Suite
... ◦ Server: Windows Server 2000/2003/2008 with .NET Framework and MySQL ...
... ◦ Server: Windows Server 2000/2003/2008 with .NET Framework and MySQL ...
normalization - SJSU Engineering
... Spaces are not allowed in entity names in a physical schema because these names must translate into SQL calls to create the tables. Table names should therefore conform to SQL naming rules. Because primary key attributes are complete inventions, they can be of any indexible data type. (Each database ...
... Spaces are not allowed in entity names in a physical schema because these names must translate into SQL calls to create the tables. Table names should therefore conform to SQL naming rules. Because primary key attributes are complete inventions, they can be of any indexible data type. (Each database ...
Iditis: Protein Structure Database - IUCr Journals
... coordinate data from which all other derived information is calculated are as reliable and consistent as possible. It is imperative that, when performing comparative analysis using data from many structures derived from different sources, the data used should conform exactly to the same standards an ...
... coordinate data from which all other derived information is calculated are as reliable and consistent as possible. It is imperative that, when performing comparative analysis using data from many structures derived from different sources, the data used should conform exactly to the same standards an ...
Introduction to SQL Server
... Create rule with CREATE RULE statement Bind rule with sp_bindrule system stored procedure Unbind with sp_unbindrule ...
... Create rule with CREATE RULE statement Bind rule with sp_bindrule system stored procedure Unbind with sp_unbindrule ...
Relational model
The relational model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and retrieval procedures for answering queries.Most relational databases use the SQL data definition and query language; these systems implement what can be regarded as an engineering approximation to the relational model. A table in an SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles.