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Lecture 4.13.2011 - Databases Part 3
Lecture 4.13.2011 - Databases Part 3

... Select Query Builder button to open the Query Builder dialog (three slides down) Top section has the fields listed for tblCustomers and all fields are selected Leave all the fields selected All fields must be selected when using the DataGridView ...
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... • An application can assign storage for results before or after it executes an SQL statement. • If an application prepares or executes the SQL statement first, it can inquire about the result set before it assigns storage for result. For example, if the result set is unknown, the application must re ...
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... – How to write Visual Basic applications that interact with databases – How to use a DataGridView control and display the data in a database – How to sort and update database data – To create an application that displays database data in list boxes, text boxes, labels, and combo boxes – To create yo ...
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... need to resubmit every statement. Savepoints are similarly useful in application programs. If a procedure contains several functions, then you can create a savepoint before each function begins. Then, if a function fails, it is easy to return the data to its state before the function began and re-ru ...
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... object event. The data model’s main function is to help us understand the complexities of the realworld environment. The database designer uses data models to facilitate the interaction among designers, application programmers, and end users. In short, a good data model is a communications device th ...
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... without being given any authorization on the relations used in the view definition Ability of views to hide data serves both to simplify usage of the system and to enhance security by allowing users access only to data they need for their job A combination or relational-level security and view-level ...
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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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