Knowledge management systems
... An entity is a person, place, thing, or event about which information is maintained. A record generally describes an entity. An attribute is a particular characteristic or quality of a particular entity. The primary key is a field that uniquely identifies a record. Secondary keys are other field tha ...
... An entity is a person, place, thing, or event about which information is maintained. A record generally describes an entity. An attribute is a particular characteristic or quality of a particular entity. The primary key is a field that uniquely identifies a record. Secondary keys are other field tha ...
Introduction to Physical Database Design
... both the producers and users of data and producing a formal requirements specification. That specification includes the data required for processing, the natural data relationships, and the software platform for the database implementation. 2. Logical database design. Logical database design develop ...
... both the producers and users of data and producing a formal requirements specification. That specification includes the data required for processing, the natural data relationships, and the software platform for the database implementation. 2. Logical database design. Logical database design develop ...
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 ...
Bild 1
... • Has a query database that contains query information and also a user database that can be central or local. • Main query information is; target database information and an SQL statement. Having a SQL statement is having a fully functional report. Then query formatting parameters can be defined to ...
... • Has a query database that contains query information and also a user database that can be central or local. • Main query information is; target database information and an SQL statement. Having a SQL statement is having a fully functional report. Then query formatting parameters can be defined to ...
Indexing Temporal Data with Virtual Structure
... query types. In [5] it has been shown that the RI-tree is superior to main competitors, the Window-List, Oracle Tile Index (T-Index) and IST-technique. However, the RI-tree need to tailor query transformation to the specific query types. It is our intention to propose an efficient access method for ...
... query types. In [5] it has been shown that the RI-tree is superior to main competitors, the Window-List, Oracle Tile Index (T-Index) and IST-technique. However, the RI-tree need to tailor query transformation to the specific query types. It is our intention to propose an efficient access method for ...
Indexing Temporal Data with Virtual Structure
... query types. In [5] it has been shown that the RI-tree is superior to main competitors, the Window-List, Oracle Tile Index (T-Index) and IST-technique. However, the RI-tree need to tailor query transformation to the specific query types. It is our intention to propose an efficient access method for ...
... query types. In [5] it has been shown that the RI-tree is superior to main competitors, the Window-List, Oracle Tile Index (T-Index) and IST-technique. However, the RI-tree need to tailor query transformation to the specific query types. It is our intention to propose an efficient access method for ...
PPTX
... statement at a time. In reality, a DBS may have many concurrent users. Each user may issue a sequence of SQL statements that form a logical unit (transaction). The DBS is in charge of ordering the SQL statements from different users in a way (serializable) that produces the same results as if the st ...
... statement at a time. In reality, a DBS may have many concurrent users. Each user may issue a sequence of SQL statements that form a logical unit (transaction). The DBS is in charge of ordering the SQL statements from different users in a way (serializable) that produces the same results as if the st ...
Chapter 22 Distributed DBMSs - Concepts and Design Transparencies
... Sites may run different DBMS products, with possibly different underlying data models. Occurs when sites have implemented their own databases and integration is considered later. Translations required to allow for: 1. Different hardware. 2. Different DBMS products. 3. Different hardware and di ...
... Sites may run different DBMS products, with possibly different underlying data models. Occurs when sites have implemented their own databases and integration is considered later. Translations required to allow for: 1. Different hardware. 2. Different DBMS products. 3. Different hardware and di ...
IT DATABASE MANAGEMENT - Housing Internal Audit Forum
... The network database is structured as a collection of record types and the relationships between these record types. All relationships are explicitly specified and stored as part of the structure of the DBMS. Another common name for the network model is CODASYL. CODASYL is named after the Conference ...
... The network database is structured as a collection of record types and the relationships between these record types. All relationships are explicitly specified and stored as part of the structure of the DBMS. Another common name for the network model is CODASYL. CODASYL is named after the Conference ...
A 3-D CITY MODEL DATA STRUCTURE AND - ETH E
... to describe DTM, a regular grid, Triangular Irregular Network (TIN) and hybrid. Many investigations have been performed concerning the implementation of the above three types of representation (Fritsch, 1992). The regular grid structure allows an easy way of handling and storing the data, which is i ...
... to describe DTM, a regular grid, Triangular Irregular Network (TIN) and hybrid. Many investigations have been performed concerning the implementation of the above three types of representation (Fritsch, 1992). The regular grid structure allows an easy way of handling and storing the data, which is i ...
Database Management - Long Beach City College
... relational databases. The program is designed to prepare students for employment in a computer field following graduation. Students wishing a Bachelors’ degree (transfer program) should meet with a counselor or advisor to discuss transferability of courses. ...
... relational databases. The program is designed to prepare students for employment in a computer field following graduation. Students wishing a Bachelors’ degree (transfer program) should meet with a counselor or advisor to discuss transferability of courses. ...
DATABASE SYSTEMS - 10p Course No. ??
... • copies of the same data on several nodes • increased reliability and access performance • more complex updating, transactions handling, recovery. – updates must be propagated to each replica! – special procedures after failures to restore consistency – more problematic transaction synchronization! ...
... • copies of the same data on several nodes • increased reliability and access performance • more complex updating, transactions handling, recovery. – updates must be propagated to each replica! – special procedures after failures to restore consistency – more problematic transaction synchronization! ...
Multimedia Database - Fakultas Ilmu Komputer UI
... SMDS-SQL may be used to query multimedia objects which are stored in the uniform representation. “What is it about the hybrid representation that causes our query language to change?” In the uniform representation, all the data sources being queried are SMDSs, while in the hybrid representatio ...
... SMDS-SQL may be used to query multimedia objects which are stored in the uniform representation. “What is it about the hybrid representation that causes our query language to change?” In the uniform representation, all the data sources being queried are SMDSs, while in the hybrid representatio ...
Multimedia Database
... SMDS-SQL may be used to query multimedia objects which are stored in the uniform representation. “What is it about the hybrid representation that causes our query language to change?” In the uniform representation, all the data sources being queried are SMDSs, while in the hybrid representatio ...
... SMDS-SQL may be used to query multimedia objects which are stored in the uniform representation. “What is it about the hybrid representation that causes our query language to change?” In the uniform representation, all the data sources being queried are SMDSs, while in the hybrid representatio ...
Chapter 1
... interacts with database by issuing an appropriate request (SQL statement) to the DBMS. Database System (DBS): is a single large repository of data, defined once and managed using DBMS while used by many application programs (DBMS + Application Program). ...
... interacts with database by issuing an appropriate request (SQL statement) to the DBMS. Database System (DBS): is a single large repository of data, defined once and managed using DBMS while used by many application programs (DBMS + Application Program). ...
1. This data type allows alphanumeric characters and special
... c. Select the third column in datasheet view then Delete ...
... c. Select the third column in datasheet view then Delete ...
How to Build a High-Performance Data Warehouse
... causing the bandwidth of this bus to rapidly become a bottleneck. In addition, shared-memory multiprocessors require complex, customized hardware to keep their L2 data caches consistent. Hence, it is unusual to see shared-memory machines of larger than 8 or 16 processors unless they are custom-built ...
... causing the bandwidth of this bus to rapidly become a bottleneck. In addition, shared-memory multiprocessors require complex, customized hardware to keep their L2 data caches consistent. Hence, it is unusual to see shared-memory machines of larger than 8 or 16 processors unless they are custom-built ...
A Spreadsheet Exercise for Teaching Data Volume and Usage
... A simple spreadsheet tool was developed. The spreadsheet has two regions. One contains estimates of the number of records and record size and volume calculations for each table in the database. The second addresses the transactions executed on the database and relationships student assignment sugges ...
... A simple spreadsheet tool was developed. The spreadsheet has two regions. One contains estimates of the number of records and record size and volume calculations for each table in the database. The second addresses the transactions executed on the database and relationships student assignment sugges ...
- bYTEBoss
... Lossless Join Decomposition Let R be a relation schema, and D = {R1, R2, ..., Rn} be a decomposition of R. D is a lossless (non-additive) join decomposition of R if for every legal instance r of R, we have ...
... Lossless Join Decomposition Let R be a relation schema, and D = {R1, R2, ..., Rn} be a decomposition of R. D is a lossless (non-additive) join decomposition of R if for every legal instance r of R, we have ...
table
... key of a parent table into a child table, where it becomes a foreign key. This type of relationship is unique because both tables share the same primary key. The primary key in the child table serves both as that table's primary key and a foreign key . ...
... key of a parent table into a child table, where it becomes a foreign key. This type of relationship is unique because both tables share the same primary key. The primary key in the child table serves both as that table's primary key and a foreign key . ...
Chapter 5 Software architecture - LHCb Online
... object and GUI layers. We describe the different layers and discuss the choice of such architecture. ...
... object and GUI layers. We describe the different layers and discuss the choice of such architecture. ...
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.