Validation of Mappings Between Data Models
... • Mapping inference allows us to check for redundant mapping formulas. • Mapping losslessness allows us to check whether some data is captured by mapping. It is a generalization of query answerability. • Query answerability checks whether the exact answer of a query is preserved by mapping. • Mappin ...
... • Mapping inference allows us to check for redundant mapping formulas. • Mapping losslessness allows us to check whether some data is captured by mapping. It is a generalization of query answerability. • Query answerability checks whether the exact answer of a query is preserved by mapping. • Mappin ...
Lecture - 01 - Human Quotient
... which data and information are collected. Attribute: A category of data or information that describes an entity. Each attribute is a fact about the entity. ...
... which data and information are collected. Attribute: A category of data or information that describes an entity. Each attribute is a fact about the entity. ...
Databases: Design, Implementation, and Management
... • To insert null value for a column, specify only the other columns or write null as the value • Can specify values for some columns, in any order, as long as values match order ...
... • To insert null value for a column, specify only the other columns or write null as the value • Can specify values for some columns, in any order, as long as values match order ...
C-Store: RDF Data Management Using Column Stores
... Real Library Data (50 million RDF triples) Data acquired from a variety of diverse sources ...
... Real Library Data (50 million RDF triples) Data acquired from a variety of diverse sources ...
ACM Proceedings Template - WORD
... To get a quick estimate of the prevalence of security problems in actual code, we used Google’s code search [5], and searched for the strings pg_query (for the function used to execute dynamic SQL queries against a postgreSQL database), and pg_query_params (used to execute prepared statements). The ...
... To get a quick estimate of the prevalence of security problems in actual code, we used Google’s code search [5], and searched for the strings pg_query (for the function used to execute dynamic SQL queries against a postgreSQL database), and pg_query_params (used to execute prepared statements). The ...
Introduction to Object Oriented Databases
... As with a relational database, a transaction is a sequence of database operations that must either all complete or all fail. If any of them fails, or if the program calls an abort method or raises an exception, the entire transaction is aborted. Only when the transaction finishes can other database ...
... As with a relational database, a transaction is a sequence of database operations that must either all complete or all fail. If any of them fails, or if the program calls an abort method or raises an exception, the entire transaction is aborted. Only when the transaction finishes can other database ...
Data Resource Management - Pohang University of Science
... In charge of enterprise-wide database development Improves integrity and security of organizational databases Uses Data Definition Language (DDL) to develop and specify data content, relationships, and structure Stores these specifications in a data dictionary or metadata repository ...
... In charge of enterprise-wide database development Improves integrity and security of organizational databases Uses Data Definition Language (DDL) to develop and specify data content, relationships, and structure Stores these specifications in a data dictionary or metadata repository ...
original - Kansas State University
... OLAP implementations using only relational database features are called relational OLAP (ROLAP) systems Hybrid systems, which store some summaries in memory and store the base data and other summaries in a relational database, are called hybrid OLAP (HOLAP) systems. ...
... OLAP implementations using only relational database features are called relational OLAP (ROLAP) systems Hybrid systems, which store some summaries in memory and store the base data and other summaries in a relational database, are called hybrid OLAP (HOLAP) systems. ...
Basic Marketing, 16e
... structure for the information in a database Before you can enter information into a database, you must define the data dictionary for all the tables and their fields. For example, when you create the Truck table, you must specify that it will have three pieces of information and that Date of Purchas ...
... structure for the information in a database Before you can enter information into a database, you must define the data dictionary for all the tables and their fields. For example, when you create the Truck table, you must specify that it will have three pieces of information and that Date of Purchas ...
department of computer sceinece - Kasturba Gandhi College for
... and also have infinite applications in various fields like Science, technology, commerce, business and entertainment. Study of Computer Science would improve the opportunities of the students in the job market substantially. In tune with these thoughts, the Department of computer Science was started ...
... and also have infinite applications in various fields like Science, technology, commerce, business and entertainment. Study of Computer Science would improve the opportunities of the students in the job market substantially. In tune with these thoughts, the Department of computer Science was started ...
Chapter 7
... often has a Database Administrator (DBA) who is responsible for managing the organization’s database. The DBA designs the databases based on the needs of the users. ...
... often has a Database Administrator (DBA) who is responsible for managing the organization’s database. The DBA designs the databases based on the needs of the users. ...
Setup of database, JMS broker, and FTP server
... requires the installation of one or more FTP servers, normally one per location Remotefile plugin needed: ...
... requires the installation of one or more FTP servers, normally one per location Remotefile plugin needed: ...
PowerPoint Chapter 3
... structure for the information in a database Before you can enter information into a database, you must define the data dictionary for all the tables and their fields. For example, when you create the Truck table, you must specify that it will have three pieces of information and that Date of Purchas ...
... structure for the information in a database Before you can enter information into a database, you must define the data dictionary for all the tables and their fields. For example, when you create the Truck table, you must specify that it will have three pieces of information and that Date of Purchas ...
Power Point - E
... • the IMDI domain is a distributed domain of linked XML files adhering to the IMDI Schema • used for management and discovery purposes • MD files are at different centers (MPI, Lund, BAS, …) and on PCs and Notebooks (fieldworkers) • is it a database – yes, but … • simply connect to the web and regis ...
... • the IMDI domain is a distributed domain of linked XML files adhering to the IMDI Schema • used for management and discovery purposes • MD files are at different centers (MPI, Lund, BAS, …) and on PCs and Notebooks (fieldworkers) • is it a database – yes, but … • simply connect to the web and regis ...
Chapter 3 - Personal Web Pages
... A set of fields is a key for a relation if : 1. No two distinct tuples can have same values in all key fields, and 2. This is not true for any subset of the key. – Part 2 false? A superkey. – If there’s >1 key for a relation, one of the keys is chosen (by DBA) to be the primary key. ...
... A set of fields is a key for a relation if : 1. No two distinct tuples can have same values in all key fields, and 2. This is not true for any subset of the key. – Part 2 false? A superkey. – If there’s >1 key for a relation, one of the keys is chosen (by DBA) to be the primary key. ...
Abstract - The number of open source database management
... quite a daunting task to subject each database system under consideration to all the available benchmark tests and tools and then make a comparison of the results. [2, 3, 4, 5, 6]. Secondly each vendor usually publishes test results of their system using a particular benchmark or benchmarks. However ...
... quite a daunting task to subject each database system under consideration to all the available benchmark tests and tools and then make a comparison of the results. [2, 3, 4, 5, 6]. Secondly each vendor usually publishes test results of their system using a particular benchmark or benchmarks. However ...
Ontology-Based Computing
... Good support for entities and hierarchical relationships; awkward for others. Constraints can be imposed on the hierarchical structure and on data types. Behavior can be specified procedurally. ...
... Good support for entities and hierarchical relationships; awkward for others. Constraints can be imposed on the hierarchical structure and on data types. Behavior can be specified procedurally. ...
white paper a comparison between relational and
... claimed that their products were relational. E.F. Codd responded by releasing a set of 12 rules that should be satisfied by any system claiming to be relational. Unfortunately, these rules excluded all systems then available, even systems like SQL which were based directly on Codd's relational calcu ...
... claimed that their products were relational. E.F. Codd responded by releasing a set of 12 rules that should be satisfied by any system claiming to be relational. Unfortunately, these rules excluded all systems then available, even systems like SQL which were based directly on Codd's relational calcu ...
Information Organization and Retrieval
... • An OODBMS is a DBMS that directly supports a model based on the objectoriented paradigm. – Like any DBMS it must provide persistent storage for objects and their descriptions (schema). – The system must also provide a language for schema definition and and for manipulation of objects and their sch ...
... • An OODBMS is a DBMS that directly supports a model based on the objectoriented paradigm. – Like any DBMS it must provide persistent storage for objects and their descriptions (schema). – The system must also provide a language for schema definition and and for manipulation of objects and their sch ...
Lecture Notes in Computer Science: - University of Bristol computer
... implemented in Macromedia Flash [9], helped enormously by the donation of code by the TheyRule social network site. ...
... implemented in Macromedia Flash [9], helped enormously by the donation of code by the TheyRule social network site. ...
OO Design and Development
... particular interface • Loose coupling – only talk to the ‘Base class’ (or interface) and not directly to sub-classes (a.k.a. program to interface/supertype) • Disadvantage: sometimes difficult to know which concrete class object is being used (breaks encapsulation/abstraction) • A LOT of design patt ...
... particular interface • Loose coupling – only talk to the ‘Base class’ (or interface) and not directly to sub-classes (a.k.a. program to interface/supertype) • Disadvantage: sometimes difficult to know which concrete class object is being used (breaks encapsulation/abstraction) • A LOT of design patt ...
Legal protection of databases in Europe and public
... – for extracting a substantial part or the whole content of the database, if the scientific work needs the treatment of a substantial part of the database (i.e. in case of statistic computation on large series of data), – in that case, it would be necessary to negotiate a specific agreement with the ...
... – for extracting a substantial part or the whole content of the database, if the scientific work needs the treatment of a substantial part of the database (i.e. in case of statistic computation on large series of data), – in that case, it would be necessary to negotiate a specific agreement with the ...
CHAPTER 1: The Roles of Data and Database Administrators
... When the error data have been processed, the db may be recovered in one of the ff ways: a. If the error is discovered soon enough, backward recovery may be used. b. If only a few errors have occurred, a series of compensating transactions may be introduced through human intervention to correct the ...
... When the error data have been processed, the db may be recovered in one of the ff ways: a. If the error is discovered soon enough, backward recovery may be used. b. If only a few errors have occurred, a series of compensating transactions may be introduced through human intervention to correct the ...
I, and X
... Examines existing facts and rules, and add new facts when possible. 2- Control: Decides the order in which inference are made. ...
... Examines existing facts and rules, and add new facts when possible. 2- Control: Decides the order in which inference are made. ...
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.