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Elmasri_6e_Ch10
Elmasri_6e_Ch10

... Time consuming, places the burden on DBA to reconcile conflicts ...
Critical Link!
Critical Link!

... - processing of sensor queries and access to the sensor network are separated. - data is extracted from the sensor network in a predefined way and is stored in a database located on a unique frontend server. - it periodically retrieves data from the sensor network and stores the data at a centralize ...
Powerpoint
Powerpoint

PPT - Electrical and Computer Engineering Department
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... ODBC stands for Open Database Connectivity ODBC is Microsoft's strategic interface for accessing data in a heterogeneous environment of relational and non- relational database management systems. ...
Backup and Recovery
Backup and Recovery

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... provided for backward compatibility. By default, it is assigned to the sysadmin fixed server role and cannot be changed. Although sa is a built-in administrator login, do not use it routinely. Instead, make system administrators members of the sysadmin fixed server role, and have them log on using t ...
Slide 1
Slide 1

... QUERIES are “questions” about the table. Assume you had 3 million records of members and their addresses, but you only wanted to know those that lived in zip code 97030 so that you could printout out mailing labels. You could print all 3 million labels and hand-sort/pull just those in zip code 9703 ...
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CREATION OF DATABASE – Practical Approach

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... perceive data. Such as: entity, attribute, relationship among entities (will explain more detail in ER model)  Physical (low-level, internal) data models: Provide concepts that describe details of how data is stored in the computer. Ex. Tree, Graph, dsb  Implementation (representational) data mode ...
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IJCEA_Paper

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... The operator  will be different for for the different forms of fragmentation. The reconstructability of the relation from its fragments ensures that constraints defined on the data in the form of dependencies are preserved. • Disjointness. If a relation R is horizontally decomposed into fragments R ...
ERP (enterprise resource planning)
ERP (enterprise resource planning)

... the client, makes a service request from another program, the server, which fulfills the request. Although the client/server idea can be used by programs within a single computer, it is a more important idea in a network. In a network, the client/server model provides a convenient way to interconnec ...
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... Data administration functions and roles A function is a set of activities to be performed Individuals are assigned roles to perform certain activities Data administration functions may be performed by a: Data administrator Data administration staff Database development Database consultant Database ...
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Why Open Source for Database Systems?

... connections, but can also help lower the total cost of ownership (TCO) of database systems. ...
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Access Unit 1 Exam

... b. Database objects c. Database certificates d. none of the above 8. A collection of organized, useful data is know as a/an ______, a. data entry b. database c. form d. query 9. Access does NOT have the following feature: ______. a. Data entry and update b. Reports c. Web support d. Slideshow 10. Rr ...
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DBMS LECTURE 01
DBMS LECTURE 01

... • Support of multiple views of the data: Each user may see a different view of the database, which describes only the data of interest to that user. • Sharing of data and multi-user transaction processing : allowing a set of concurrent users to retrieve and to update the database. Concurrency contro ...
Introduction to Database Systems
Introduction to Database Systems

... data’s expected use (ideally logically related)  System was adequate for small amounts of data with few reporting requirements  Finding and using data in growing collections of file folders became time-consuming and ...
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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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