CS6362 1998 - Northumbria University
... – Prof. Norman Paton, Object Relational Databases, University of Manchester. Advanced Databases (CM036): Lecture # 4 (Object-Relational and Nested-Relational Databases ...
... – Prof. Norman Paton, Object Relational Databases, University of Manchester. Advanced Databases (CM036): Lecture # 4 (Object-Relational and Nested-Relational Databases ...
Mining Model Trees: A Multi-relational Approach
... sample data falling in the same leaf. Some of the model tree induction systems are M5 [23], RETIS, [9], M5’ [27], HTL [26], TSIR [17], and SMOTI [18]. The last two systems are characterised by a tree structure with two types of nodes: regression nodes, which perform only straight-line regression, an ...
... sample data falling in the same leaf. Some of the model tree induction systems are M5 [23], RETIS, [9], M5’ [27], HTL [26], TSIR [17], and SMOTI [18]. The last two systems are characterised by a tree structure with two types of nodes: regression nodes, which perform only straight-line regression, an ...
Chapter 5
... Constraints are conditions that must hold on all valid relation states. There are three main types of constraints in the relational model: ...
... Constraints are conditions that must hold on all valid relation states. There are three main types of constraints in the relational model: ...
Oracle Backup Methods
... • Fills the gaps of Data Guard by replicating non-Oracle systems and source code as well as tables in NOLOGGING mode • Works best in conjunction with Data Guard by jointly reducing replication traffic and reducing or eliminating single points of failure • Significantly improves RTO and RPO CONS: • S ...
... • Fills the gaps of Data Guard by replicating non-Oracle systems and source code as well as tables in NOLOGGING mode • Works best in conjunction with Data Guard by jointly reducing replication traffic and reducing or eliminating single points of failure • Significantly improves RTO and RPO CONS: • S ...
A Novel Approach for Integrating Heterogeneous Database
... Heterogeneous database integration systems are computational models and software implementations. They provide a single, uniform query interface to data that are stored and managed in multiple, heterogeneous data sources [12][24].The goal of such systems is to provide database transparency to users ...
... Heterogeneous database integration systems are computational models and software implementations. They provide a single, uniform query interface to data that are stored and managed in multiple, heterogeneous data sources [12][24].The goal of such systems is to provide database transparency to users ...
SOLVED PAPERS OF ICS PART-2 (Computer Science) LAHORE
... An attribute or set of attributes that is basis for retrieval is known as secondary key. Secondary key can be a non-unique attribute. One secondary key value may refer to many records. An attribute or set of attributes that uniquely identify a row or record in a relation is known as primary key. A r ...
... An attribute or set of attributes that is basis for retrieval is known as secondary key. Secondary key can be a non-unique attribute. One secondary key value may refer to many records. An attribute or set of attributes that uniquely identify a row or record in a relation is known as primary key. A r ...
Lecture 6 - Relational Algebra I
... 1. r, s must have the same arity (same number of attributes) 2. The attribute domains must be compatible (e.g., 2nd column of r deals with the same type of values as does the 2nd column of s) E.g. to find all customers with either an account or a loan ...
... 1. r, s must have the same arity (same number of attributes) 2. The attribute domains must be compatible (e.g., 2nd column of r deals with the same type of values as does the 2nd column of s) E.g. to find all customers with either an account or a loan ...
Extreme Database programming with MUMPS Globals
... records. This gives you incredible flexibility and speed of development. You can arbitrarily assign one or more data delimiters to break the text value of an array record into a number of “fields”. The total string length that can be assigned to a single array record depends on the MUMPS implementat ...
... records. This gives you incredible flexibility and speed of development. You can arbitrarily assign one or more data delimiters to break the text value of an array record into a number of “fields”. The total string length that can be assigned to a single array record depends on the MUMPS implementat ...
BIS4435 Discussion Topic 1 Answer by Faith Ime Abakada
... key. For referential integrity to hold, any field in a table that is declared a foreign key can contain only values from a parent table's primary key field”[1]. Referential integrity is a database management safeguard that ensures every foreign key match a primary key. For example, client numbers in ...
... key. For referential integrity to hold, any field in a table that is declared a foreign key can contain only values from a parent table's primary key field”[1]. Referential integrity is a database management safeguard that ensures every foreign key match a primary key. For example, client numbers in ...
Chapter 8: Object-Oriented Databases Need for Complex Data Types
... which are independent of each other " E.g. temporary/permanent is independent of Officer/secretary/teller " Create a subclass for each combination of subclasses ...
... which are independent of each other " E.g. temporary/permanent is independent of Officer/secretary/teller " Create a subclass for each combination of subclasses ...
PDF
... not considering analog-based systems, and those which disregard polyphony, as these systems tend to be quite different internally. We will focus on each system’s query format, database schema, and respective advantages and disadvantages. These restrictions set our focus on Semex [1] and a system by ...
... not considering analog-based systems, and those which disregard polyphony, as these systems tend to be quite different internally. We will focus on each system’s query format, database schema, and respective advantages and disadvantages. These restrictions set our focus on Semex [1] and a system by ...
Chapter 7: Relational Database Design
... which are independent of each other E.g. temporary/permanent is independent of Officer/secretary/teller Create a subclass for each combination of subclasses – Need not create subclasses for combinations that are not possible in the database being modeled A class inherits variables and methods ...
... which are independent of each other E.g. temporary/permanent is independent of Officer/secretary/teller Create a subclass for each combination of subclasses – Need not create subclasses for combinations that are not possible in the database being modeled A class inherits variables and methods ...
Overview and History of Databases and Transactions
... Relational DBMSs (1980s) Edgar F. Codd's relational model in 1970 Set of tuples (i.e., tables) as data model Powerful high-level query language Object-Oriented DBMSs (1990s) Motivated by “impedance mismatch” between RDBMS and OO PL Persistent types in C++, Java or Small Talk Issues: ...
... Relational DBMSs (1980s) Edgar F. Codd's relational model in 1970 Set of tuples (i.e., tables) as data model Powerful high-level query language Object-Oriented DBMSs (1990s) Motivated by “impedance mismatch” between RDBMS and OO PL Persistent types in C++, Java or Small Talk Issues: ...
Chapter 8: Object-Oriented Databases
... which are independent of each other " E.g. temporary/permanent is independent of Officer/secretary/teller " Create a subclass for each combination of subclasses ...
... which are independent of each other " E.g. temporary/permanent is independent of Officer/secretary/teller " Create a subclass for each combination of subclasses ...
Development of SRS.php, a Simple Object Access Protocol
... The initial core of request methods present in the SRS.php library consists of 4 functions that allow the data integration between the SRS database engine and PHP dynamic scripts. These functions interact with SRS based on information found on its WSDL description file. This file is accessed using t ...
... The initial core of request methods present in the SRS.php library consists of 4 functions that allow the data integration between the SRS database engine and PHP dynamic scripts. These functions interact with SRS based on information found on its WSDL description file. This file is accessed using t ...
CSC309 Tutorial: JDBC
... database by invoking SQL commands. q PointBase supports the JDBC API. For a list of supported and unsupported methods, refer to the PointBase documentation. q Interaction of applications with the PointBase embedded: ...
... database by invoking SQL commands. q PointBase supports the JDBC API. For a list of supported and unsupported methods, refer to the PointBase documentation. q Interaction of applications with the PointBase embedded: ...
Administration of Users
... Documentation of User Administration • Part of the administration process • Reasons to document: – Provide a paper trail – Ensure administration consistency ...
... Documentation of User Administration • Part of the administration process • Reasons to document: – Provide a paper trail – Ensure administration consistency ...
slides - CIS @ Temple University
... Metadata Features ResultSet metadata E.g., after executing query to get a ResultSet rs: ...
... Metadata Features ResultSet metadata E.g., after executing query to get a ResultSet rs: ...
ch5
... Constraints determine which values are permissible and which are not in the database. They are of three main types: 1. Inherent or Implicit Constraints: These are based on the data model itself. (E.g., relational model does not allow a list as a value for any attribute) 2. Schema-based or Explicit C ...
... Constraints determine which values are permissible and which are not in the database. They are of three main types: 1. Inherent or Implicit Constraints: These are based on the data model itself. (E.g., relational model does not allow a list as a value for any attribute) 2. Schema-based or Explicit C ...
Multi-Dimensional Clustering: a new data layout
... some multidimensional cube form [2]. A request to find regions in this cube is easily satisfied by OLAP systems. However, these systems usually suffer from sparsity and scalability problems. OLAP systems organize data by maintaining a physical cell for each possible dimension combination. When data ...
... some multidimensional cube form [2]. A request to find regions in this cube is easily satisfied by OLAP systems. However, these systems usually suffer from sparsity and scalability problems. OLAP systems organize data by maintaining a physical cell for each possible dimension combination. When data ...
Object-Oriented Databases Need for Complex Data Types Object
... Store collections of objects, and allow programs to iterate ...
... Store collections of objects, and allow programs to iterate ...
FederatedDataWarehouse
... ....a uniform access to autonomous and heterogeneous information sources. Furthermore, information sources may be classified as structured, as for instance relational databases, semi structured, i.e. web pages in HTML source, or de structured (text or images) The basic components of a FIS are [12] f ...
... ....a uniform access to autonomous and heterogeneous information sources. Furthermore, information sources may be classified as structured, as for instance relational databases, semi structured, i.e. web pages in HTML source, or de structured (text or images) The basic components of a FIS are [12] f ...