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FRM015 Database Training Data Entry Training
FRM015 Database Training Data Entry Training

... 1. Understands need for clear audit trail from source data to database 2. Understands which data verification checks are required prior to eCRF completion 3. Understands need for password control of electronically stored data 4. Understands how to log in to database system 5. Understands how to sele ...
DBS201: Database Design and Introduction to SQL
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OR102 - PL/SQL and Database Objects
OR102 - PL/SQL and Database Objects

LN1 - WSU EECS
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NetSEC: metrology based-application for network security
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CS186 - Introduction to Database Systems Fall Semester 2003 Prof
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School of Computer Science - School of Computing and Information
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... A flat file database has just a single table. In some cases, this may be all that’s needed. A relational database, however, can have multiple tables, with – as the name suggests – relationships between them. This allows you to record information about multiple types of entity, and to show how these ...
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... DDBMS: - no performance degradation due to distributed architecture. - determine most cost-effective strategy to execute a request. Distributed Query Processor (DQP) maps data request into ordered sequence of operations on local databases. - Must consider fragmentation, replication, and allocation s ...
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... scenario would unlikely happen in a well controlled production environment – however sometimes even the best run shops can experience this. Being able to catch this – and then to quickly and accurately restore the database to its desired state is critical. Thus many DBA’s have several generally acce ...
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BCS Higher Education Qualifications  Diploma in IT
BCS Higher Education Qualifications Diploma in IT

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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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