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mod-19
mod-19

...  For joins were partitioning is not applicable, parallelization can be accomplished by fragment and replicate technique  Depicted on next slide  Special case – asymmetric fragment-and-replicate: ...
branch-name - VUB STARLab
branch-name - VUB STARLab

... balance is more than $1,200. select branch-name, avg (balance) from account group by branch-name having avg (balance) > 1200 ...
Greenplum Database: Critical Mass Innovation Architecture White Paper August 2010
Greenplum Database: Critical Mass Innovation Architecture White Paper August 2010

... In today’s business climate, every leading organization finds itself in the data business. With each click, call, or transaction by a user, or other business activity, data is generated that can contribute to the aggregate knowledge of the business. From this data can come insights that can help the ...
RAK - Friedrich Lehn | Consultant, Coach & Trainer
RAK - Friedrich Lehn | Consultant, Coach & Trainer

...  INSTALLED (list of environments where release is installed)  TRANSITIONS (describes the deployment path of a release)  RESPONSIBLE (due to centralized freeze routine)  PCRVERSION (PowerCenter meta data version) ...
Oracle Database 11g Family
Oracle Database 11g Family

... clustered hardware configurations, with the simplicity and ease of use of a single system image. Oracle Real Application Clusters allows access to a single database from multiple servers on a cluster, insulating both applications and database users from server failures, while providing performance t ...
Parallel Databases
Parallel Databases

...  For joins were partitioning is not applicable, parallelization can be accomplished by fragment and replicate technique  Depicted on next slide  Special case – asymmetric fragment-and-replicate: ...
Ch2
Ch2

... • Relational DBMS servers are often called SQL servers, query servers, or transaction servers • Applications running on clients utilize an Application Program Interface (API) to access server databases via standard interface such as: – ODBC: Open Database Connectivity standard – JDBC: for Java progr ...
Slide 1
Slide 1

... ● The database may be easily deployed, running either standalone, inside a servlet engine, or directly embedded in an application. ...
Oracle Database 11g Family
Oracle Database 11g Family

... clustered hardware configurations, with the simplicity and ease of use of a single system image. Oracle Real Application Clusters allows access to a single database from multiple servers on a cluster, insulating both applications and database users from server failures, while providing performance t ...
Database Schema Evolution And Meta Modeling
Database Schema Evolution And Meta Modeling

... evolution the online modeling tool has been extended with new that compares the tables in the current database with the, an axiomatic model of dynamic schema evolution in - selected papers from the 9th international workshop on foundations of models and languages for data and objects database schema ...
Ch3_RM - Fordham University Computer and Information
Ch3_RM - Fordham University Computer and Information

...  Option 1: Delete/Update all Enrolled rows that refer to the deleted sid in Students (CASCADE). Both are affected  Option 2: Reject the deletion/updating of the Students row if an Enrolled row refers to it (NO ACTION ). [The default action for SQL]. None is affected.  Option 3: Set the sid of Enr ...
Introduction Using SQL from Programs - auf Matthias
Introduction Using SQL from Programs - auf Matthias

... • application started from scratch • application is rather simple: few persistent classes • Relational schema is generated from persistent ...
Data Compression and Database Performance
Data Compression and Database Performance

Normalization of Database Tables
Normalization of Database Tables

...  When primary key is considered to be unsuitable, designers use system-defined surrogate keys  The DBMS can be used to have the system assign the PK values (JOB_CODE) >> to ensure entity integrity ...
Data and Databases
Data and Databases

... U.S. college could use the Social Security number as its primary key. In addition, locating a particular record may require the use of secondary keys. Secondary keys are other fields that have some identifying information, but typically do not identify the file with complete accuracy. For example, t ...
Replicating Oracle Databases with Quest SharePlex Compared to
Replicating Oracle Databases with Quest SharePlex Compared to

... corruptions occur, the ability to restore not only business-critical information but also application and end-user access to that information becomes paramount. Lost or prolonged inaccessibility to business-critical data and applications most often means lost revenue and productivity to the business ...
Database Design
Database Design

... – Physical representation and location of data and the use of that data are separated • The application doesn’t need to know how or where the database has stored the data, but just how to ask for it • Moving a database from one DBMS to another should not have a material effect on application program ...
Spatio-Temporal Data Types: An Approach to Modeling
Spatio-Temporal Data Types: An Approach to Modeling

... steps. Examples are boundaries of states, or cadastral applications, where e.g. changes of ownership of a piece of land can only happen through specific legal actions. Our proposed way of modeling is general and includes these cases, but for them also more traditional strategies could be used, and w ...
FREE Sample Here
FREE Sample Here

Developing Web Based Database Applications with ASP.NET and VB
Developing Web Based Database Applications with ASP.NET and VB

... If a data source has hundreds of records to display, it may clutter a Web page – The GridView control provides a well-structured and well-formatted solution – Through paging, the control allows us to display a large number of records on multiple pages  Users can view a fixed number of records at a ...
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Agenda Single-User System Centralized Multi

ps - CS
ps - CS

... from Java applications Information is transferred from relations to objects and vice-versa databases optimized for searching/indexing objects optimized for engineering/flexibility ...
Paper - IEEE HPEC
Paper - IEEE HPEC

... for each event attribute, field. Figure 3 shows the key scheme for the event and index tables. Note that Accumulo keys support column families (for locality grouping), cell versioning, and cell access control. For simplicity, these components of the entry keys are not shown in Figure 3. The final op ...
Weak Entity Sets
Weak Entity Sets

... be made a strong entity, but then the relationship between payment and loan would be duplicated by an implicit relationship defined by the attribute loannumber common to payment and loan ...
cos 346 day 8 & 9
cos 346 day 8 & 9

...  In some situations, a surrogate key should be defined Copyright © 2004 Database Processing: Fundamentals, Design, and Implementation, 9/e by David M. Kroenke ...
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Concurrency control

In information technology and computer science, especially in the fields of computer programming, operating systems, multiprocessors, and databases, concurrency control ensures that correct results for concurrent operations are generated, while getting those results as quickly as possible.Computer systems, both software and hardware, consist of modules, or components. Each component is designed to operate correctly, i.e., to obey or to meet certain consistency rules. When components that operate concurrently interact by messaging or by sharing accessed data (in memory or storage), a certain component's consistency may be violated by another component. The general area of concurrency control provides rules, methods, design methodologies, and theories to maintain the consistency of components operating concurrently while interacting, and thus the consistency and correctness of the whole system. Introducing concurrency control into a system means applying operation constraints which typically result in some performance reduction. Operation consistency and correctness should be achieved with as good as possible efficiency, without reducing performance below reasonable levels. Concurrency control can require significant additional complexity and overhead in a concurrent algorithm compared to the simpler sequential algorithm.For example, a failure in concurrency control can result in data corruption from torn read or write operations.
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