5 Foundations of Business Intelligence: Databases
... • Used by relational databases to ensure that relationships between coupled tables remain consistent. • E.g., when one table has a foreign key that points to another table, you may not add a record to the table with foreign key unless there is a corresponding record in the linked table. ...
... • Used by relational databases to ensure that relationships between coupled tables remain consistent. • E.g., when one table has a foreign key that points to another table, you may not add a record to the table with foreign key unless there is a corresponding record in the linked table. ...
R - United International College
... holds on R if and only if for any legal relations r(R), whenever any two tuples t1 and t2 of r agree on the attributes , they also agree on the attributes . That is, ...
... holds on R if and only if for any legal relations r(R), whenever any two tuples t1 and t2 of r agree on the attributes , they also agree on the attributes . That is, ...
here
... Database Security Database Security: Protection of the data against accidental or intentional loss, destruction, or ...
... Database Security Database Security: Protection of the data against accidental or intentional loss, destruction, or ...
Person
... the parameter can be omitted. Execute the mapping by passing the parameter and the name you gave the statement or procedure in your XML descriptor. This step is where the magic happens. The framework will prepare the SQL statement or stored procedure, set any runtime values using your parameter, e ...
... the parameter can be omitted. Execute the mapping by passing the parameter and the name you gave the statement or procedure in your XML descriptor. This step is where the magic happens. The framework will prepare the SQL statement or stored procedure, set any runtime values using your parameter, e ...
entity set
... • An entity set that does not have a primary key is referred to as a weak entity set. • The existence of a weak entity set depends on the existence of a identifying entity set – It must relate to the identifying entity set via a total, one-to-many relationship set from the identifying to the weak en ...
... • An entity set that does not have a primary key is referred to as a weak entity set. • The existence of a weak entity set depends on the existence of a identifying entity set – It must relate to the identifying entity set via a total, one-to-many relationship set from the identifying to the weak en ...
title
... ▶ Physically identical copy of the primary database.(Disk Structures identical to the Primary Db on a block-for-block basis). ▶ Synced: A Physical standby database is synced with the primary database, through Redo Apply, which recovers the redo data received from the Primary side and applies the red ...
... ▶ Physically identical copy of the primary database.(Disk Structures identical to the Primary Db on a block-for-block basis). ▶ Synced: A Physical standby database is synced with the primary database, through Redo Apply, which recovers the redo data received from the Primary side and applies the red ...
Performance Troubleshooting Checklist (Long Form)
... your environment and setup can be useful in diagnosing the issue. The following checklist can be used to help you identify possible areas of focus, allowing you to isolate and correct the performance problem. This checklist is also required should you contact Blackbaud Customer Support for assistanc ...
... your environment and setup can be useful in diagnosing the issue. The following checklist can be used to help you identify possible areas of focus, allowing you to isolate and correct the performance problem. This checklist is also required should you contact Blackbaud Customer Support for assistanc ...
ER Model
... • An entity set that does not have a primary key is referred to as a weak entity set. • The existence of a weak entity set depends on the existence of a identifying entity set – It must relate to the identifying entity set via a total, one-to-many relationship set from the identifying to the weak en ...
... • An entity set that does not have a primary key is referred to as a weak entity set. • The existence of a weak entity set depends on the existence of a identifying entity set – It must relate to the identifying entity set via a total, one-to-many relationship set from the identifying to the weak en ...
Mobile Database Systems Report
... mobile hosts may, at times, be powered down, a host may leave one cell and re-materialize later at some distant cell. Therefore, moves between cells are not necessarily between adjacent cells. Within a small area, such as a building, Mobile hosts may be connected by a wireless local-area network wit ...
... mobile hosts may, at times, be powered down, a host may leave one cell and re-materialize later at some distant cell. Therefore, moves between cells are not necessarily between adjacent cells. Within a small area, such as a building, Mobile hosts may be connected by a wireless local-area network wit ...
Symfony2 Tutorial
... After a model update the model notifies its associated views and controllers, so that the views can produce updated output, and the controllers to change the available set of commands A view requests from the model information needed to generate an output representation ...
... After a model update the model notifies its associated views and controllers, so that the views can produce updated output, and the controllers to change the available set of commands A view requests from the model information needed to generate an output representation ...
Transparent Access to Archived Data
... – Bottom line impact – Uncontrolled cost spiral Institute rigorous database tuning – Does not directly address data growth – Reaches point of diminishing returns Delete/ purge data – Legal and data retention issues – Data may be needed for data warehousing In-house development – Complex undert ...
... – Bottom line impact – Uncontrolled cost spiral Institute rigorous database tuning – Does not directly address data growth – Reaches point of diminishing returns Delete/ purge data – Legal and data retention issues – Data may be needed for data warehousing In-house development – Complex undert ...
M.Sc. Bioinformatics
... Architecture- Data models, Schema and Instances- Database Languages- Database users and administrator- Advantages of using DBMS approach- Introduction to Relational database. UNIT II Database Design: Data Modeling using Entity- Relationship (ER) model, Entity typesentity sets, attributes and keys- R ...
... Architecture- Data models, Schema and Instances- Database Languages- Database users and administrator- Advantages of using DBMS approach- Introduction to Relational database. UNIT II Database Design: Data Modeling using Entity- Relationship (ER) model, Entity typesentity sets, attributes and keys- R ...
FOUNDATIONS OF BUSINESS INTELLIGENCE: DATABASES …
... A relational database organizes data in the form of two-dimensional tables. Illustrated here are tables for the entities SUPPLIER and PART showing how they represent each entity and its attributes. Supplier Number is a primary key for the SUPPLIER table and a foreign key for the PART table. ...
... A relational database organizes data in the form of two-dimensional tables. Illustrated here are tables for the entities SUPPLIER and PART showing how they represent each entity and its attributes. Supplier Number is a primary key for the SUPPLIER table and a foreign key for the PART table. ...
tr-2005-151
... The topology replication carries through to the mesh level. The mapping defined at the topology level is “pushed down” to the finer mesh level. Mesh objects in the interior of grains are unaffected by this replication. However, vertices, edges, triangles, etc., on grain surfaces need to be duplicate ...
... The topology replication carries through to the mesh level. The mapping defined at the topology level is “pushed down” to the finer mesh level. Mesh objects in the interior of grains are unaffected by this replication. However, vertices, edges, triangles, etc., on grain surfaces need to be duplicate ...
Chapter 7 Database Design Models— the UML Profile for Database Design
... catalogs,you may not have an employee who sold the product; the customer may have purchased it without employee assistance. Therefore it is not mandatory that a customer exist only when associated to an employee. The identifying relationship is created with a stereotype of <> on a compo ...
... catalogs,you may not have an employee who sold the product; the customer may have purchased it without employee assistance. Therefore it is not mandatory that a customer exist only when associated to an employee. The identifying relationship is created with a stereotype of <
SQL DOM: Compile Time Checking of Dynamic SQL Statements
... between the two goals, we always chose the first goal. One example of the struggle between these two goals occurred during the design of the class that would be used to construct insert SQL statements. For an insert SQL statement to be valid it has to contain a value for every column in the table th ...
... between the two goals, we always chose the first goal. One example of the struggle between these two goals occurred during the design of the class that would be used to construct insert SQL statements. For an insert SQL statement to be valid it has to contain a value for every column in the table th ...
AO6 - Database Guide - Burton Borough School
... colour scheme that you would like (you do not have to choose Corporate) ...
... colour scheme that you would like (you do not have to choose Corporate) ...
Introduction to Databases Lecture 1 Chapters 1 - 2 Robb T. Koether
... a list of passengers on flight #123. At the very same time, Bob, another airline employee, goes online to change the flight number from #123 to #456. Alice selects the first 50 names of passengers on flight #123. At that moment, the flight number is changed to #456. The last 50 names are not selecte ...
... a list of passengers on flight #123. At the very same time, Bob, another airline employee, goes online to change the flight number from #123 to #456. Alice selects the first 50 names of passengers on flight #123. At that moment, the flight number is changed to #456. The last 50 names are not selecte ...
Cathedron Manual
... A typical Cathedron application requires only a fraction of the code you would have needed in a 3rd generation language. Your focus stays on the code that matters. Code that directly implements a restriction or a calculation. Code that is almost self describing and can be easily understood in the co ...
... A typical Cathedron application requires only a fraction of the code you would have needed in a 3rd generation language. Your focus stays on the code that matters. Code that directly implements a restriction or a calculation. Code that is almost self describing and can be easily understood in the co ...
Who Do You Have? Where Are They?
... subjects do you have? In what data sets do they provide data? Is the data in the different data sets consistent? If you had only 2 or 3 small data sets, you might just open them up with the SAS viewer and resolve these questions by inspection. However, when your database consists of dozens, if not h ...
... subjects do you have? In what data sets do they provide data? Is the data in the different data sets consistent? If you had only 2 or 3 small data sets, you might just open them up with the SAS viewer and resolve these questions by inspection. However, when your database consists of dozens, if not h ...
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.