Chapter 3: Organizing Data and Information
... • Hierarchy of data: bits, characters, fields, records, files, and databases • An entity is a generalized class of things (objects) for which data is collected, stored, and maintained • Attribute: characteristic of an entity • Data model: diagram of entities and relationships • Relational model: des ...
... • Hierarchy of data: bits, characters, fields, records, files, and databases • An entity is a generalized class of things (objects) for which data is collected, stored, and maintained • Attribute: characteristic of an entity • Data model: diagram of entities and relationships • Relational model: des ...
Learning Microsoft BI – Where to Start
... Microsoft Certified Technology Specialist – SQL Server 2008, Implementation and Maintenance Microsoft Certified Technology Specialist – Microsoft Windows SharePoint Services 3.0, Application Development Microsoft Certified Technology Specialist – Microsoft Windows SharePoint Services 3.0, Configurat ...
... Microsoft Certified Technology Specialist – SQL Server 2008, Implementation and Maintenance Microsoft Certified Technology Specialist – Microsoft Windows SharePoint Services 3.0, Application Development Microsoft Certified Technology Specialist – Microsoft Windows SharePoint Services 3.0, Configurat ...
LN28 - WSU EECS
... Why do we care about big data? Is there any fundamental challenge introduced by querying big data? Why study Big Data? ...
... Why do we care about big data? Is there any fundamental challenge introduced by querying big data? Why study Big Data? ...
Chapter -3
... • Hierarchy of data: bits, characters, fields, records, files, and databases • An entity is a generalized class of things (objects) for which data is collected, stored, and maintained • Attribute: characteristic of an entity • Data model: diagram of entities and relationships • Relational model: des ...
... • Hierarchy of data: bits, characters, fields, records, files, and databases • An entity is a generalized class of things (objects) for which data is collected, stored, and maintained • Attribute: characteristic of an entity • Data model: diagram of entities and relationships • Relational model: des ...
XML
... Nesting is supported in object-relational databases (?*!—CZ) But nesting is appropriate when transferring data ...
... Nesting is supported in object-relational databases (?*!—CZ) But nesting is appropriate when transferring data ...
Distributed database - GCG-42
... Different columns of a table at different sites Advantages and disadvantages are the same as for horizontal partitioning except that combining data across partitions is more difficult because it requires joins (instead of unions) ...
... Different columns of a table at different sites Advantages and disadvantages are the same as for horizontal partitioning except that combining data across partitions is more difficult because it requires joins (instead of unions) ...
2 Variability-Aware design of Database Technology
... Moving from formal definition to feature models Variability across DB design life-cycle ...
... Moving from formal definition to feature models Variability across DB design life-cycle ...
Security and Integrity
... Legal and ethical issues regarding the right to access certain information. In US there are many laws governing privacy of information. Policy issues at the governmental, institutional, or corporate level as to what kinds of information should not be made publicly available – for example, credit rat ...
... Legal and ethical issues regarding the right to access certain information. In US there are many laws governing privacy of information. Policy issues at the governmental, institutional, or corporate level as to what kinds of information should not be made publicly available – for example, credit rat ...
Overview of ADO.NET
... The DataSet object is a disconnected collection of one or more tables that are stored in memory. The DataSet is effectively a private copy of the database in the memory, complete with tables, columns, relationships, constraints, and data. However, it may not necessarily reflect the current state ...
... The DataSet object is a disconnected collection of one or more tables that are stored in memory. The DataSet is effectively a private copy of the database in the memory, complete with tables, columns, relationships, constraints, and data. However, it may not necessarily reflect the current state ...
Introduction to Oracle - University of Windsor
... This background process is responsible for managing the contents of the data block buffer cache and dictionary cache. DBWR performs batch writes of changed block. Since Oracle uses write-ahead logging, DBWR does not need to write blocks when a transaction commits. In the most common case, DBWR write ...
... This background process is responsible for managing the contents of the data block buffer cache and dictionary cache. DBWR performs batch writes of changed block. Since Oracle uses write-ahead logging, DBWR does not need to write blocks when a transaction commits. In the most common case, DBWR write ...
mysql_T1
... • The db table scope columns determine which users can access which databases from which hosts. The privilege columns determine which operations are allowed. A privilege granted at the database level applies to the database and to all its tables • The host table is used in conjunction with the db ta ...
... • The db table scope columns determine which users can access which databases from which hosts. The privilege columns determine which operations are allowed. A privilege granted at the database level applies to the database and to all its tables • The host table is used in conjunction with the db ta ...
DB2_Ch08
... • The MINUS statement in SQL combines rows from two queries and returns only the rows that appear in the first set but not in the second ...
... • The MINUS statement in SQL combines rows from two queries and returns only the rows that appear in the first set but not in the second ...
Lecture Slides DBTransactions
... consistent state it was in before the transaction started. • Compensating transaction: A committed transaction cannot be aborted. If we decide that the committed transaction was a mistake we must perform a compensating transaction to revers its effect. ...
... consistent state it was in before the transaction started. • Compensating transaction: A committed transaction cannot be aborted. If we decide that the committed transaction was a mistake we must perform a compensating transaction to revers its effect. ...
Information System for a Movie Theater
... number of tickets available per show. (d) When a customer purchases tickets for a movie, the following is recorded: ticket number, date, unit price, amount paid, and number of tickets purchased. The number of tickets purchased reduces the total number of tickets available. (e) Some of the customers ...
... number of tickets available per show. (d) When a customer purchases tickets for a movie, the following is recorded: ticket number, date, unit price, amount paid, and number of tickets purchased. The number of tickets purchased reduces the total number of tickets available. (e) Some of the customers ...
CS 245: Database System Principles
... – Semantic differences: One dealer distinguish station wagon from minivans, while another doesn’t – Missing values: A source does not record information that all or most of the other sources provide ...
... – Semantic differences: One dealer distinguish station wagon from minivans, while another doesn’t – Missing values: A source does not record information that all or most of the other sources provide ...
chap05
... normalization rules • As normalization issues arise, the initial relation design may need to change © 2002 by Prentice Hall ...
... normalization rules • As normalization issues arise, the initial relation design may need to change © 2002 by Prentice Hall ...
OBIEE Federation
... a single logical fact table to multiple LTS’s. • Physical fact table in our EDW called SALES_FACT • Physical fact table in our source system to represent real-time data • One logical fact table in the BMM — called “Sales ...
... a single logical fact table to multiple LTS’s. • Physical fact table in our EDW called SALES_FACT • Physical fact table in our source system to represent real-time data • One logical fact table in the BMM — called “Sales ...
Data Modeling - Temple Fox MIS
... So why do you think we defined “Zip” as a VARCHAR() instead of an INT? ...
... So why do you think we defined “Zip” as a VARCHAR() instead of an INT? ...
report - SLAC Conference Services
... The workshop was organized to provide a forum for discussions focused on issues pertaining to extremely large databases. Participants represented a broad range of scientific and industrial database-intensive applications, DBMS vendors, and academia. The vast majority of discussed systems ranged from ...
... The workshop was organized to provide a forum for discussions focused on issues pertaining to extremely large databases. Participants represented a broad range of scientific and industrial database-intensive applications, DBMS vendors, and academia. The vast majority of discussed systems ranged from ...
The BUCKY Object-Relational Benchmark
... object-relational technology greatly expands the space of alternatives available to a schema designer. For example, one can use an inheritance hierarchy or a set of independent tables; one can use inter-object references or key/foreign-key pairs; one can use set-valued attributes or store the eleme ...
... object-relational technology greatly expands the space of alternatives available to a schema designer. For example, one can use an inheritance hierarchy or a set of independent tables; one can use inter-object references or key/foreign-key pairs; one can use set-valued attributes or store the eleme ...
Data Base Design for Decision Support Systems
... A :JSS database may support this function. Hov;evel.-, i t must also support unusual requests for information plus reformulation an:i sub setting of existing reports. The data files which support traditional information processing Systems can be efficiently tailored to providing data for predetermin ...
... A :JSS database may support this function. Hov;evel.-, i t must also support unusual requests for information plus reformulation an:i sub setting of existing reports. The data files which support traditional information processing Systems can be efficiently tailored to providing data for predetermin ...
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.