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ppt
ppt

... • Equivalent expressions • Different algorithms for each operation (Chapter 13) • Cost difference between a good and a bad way of evaluating a query can be enormous • Example: performing a r X s followed by a selection r.A = s.B is much slower than performing a join on the same condition • Need to e ...
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... The Metadata Manager Agent is a Windows-based program that Metadata Manager uses to access metadata sources and extract source metadata. By default, the Metadata Manager Agent runs on the Windows nodes where the Metadata Manager Service runs. The Metadata Manager Agent does not run on UNIX. If the M ...
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... migration. Many Oracle databases tend to be medium to large in size, ranging anywhere from 10 GB to 5 TB, with some as large as 5 TB to 20 TB or more. However, you also might need to migrate smaller databases. This is especially true for phased migrations where the databases are broken up by schema, ...
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... the item is found and brought to one of the offices, they would be [automatically] notified. Additionally, the process of recovering these lost items could sometimes be very tedious. For example, when users are not sure any more as to when they lost an item, most likely, the workers at the lost and ...
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... supports basic SQL functionality. It provides RDBMS access by allowing you to embed SQL inside Java code. Because Java can run on a thin client, applets embedded in Web pages can contain downloadable JDBC code to enable remote database access. You will learn how to create a table, insert values into ...
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... as the transformations involved in producing the concrete data item. It can be used to estimate the quality of data, determine trust measures of data, to gain additional insights about it, or to trace errors in transformed data back to its origins. A complete record of provenance in scientific compu ...
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... physics data require stable trigger setup – no trigger configuration changes while running – exception 1: pre-scaling of trigger algorithms: • luminosity drops while running  trigger rates decrease decrease pre-scaling (in steps) to compensate – using pre-defined pre-scaling sets (set index 0, 1, ...
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... basis. Of all the features that SAS provides, the most used at ETAC are its database access procedures, PROC ACCESS and PROC SOL. In earlier versions of SAS, we were forced to manually create a new access and view descriptor for each table we_wanted to use with SAS, and store these in a library. Whe ...
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... high transaction rate that also serves as a management reporting system. With replication, the data could be owned and maintained by the transaction system and replicated to another database location that could be specially tailored for read-only management reporting. Disaster Site Maintenance. With ...
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... support for necessities such as back orders or contracts that require purchases at specific intervals. Also proprietary architectures often make it difficult to customize some commerce offerings, and back-end integration issues may require writing your own custom code for each legacy system that nee ...
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... In this chapter we are going to link a label (the container) with a database (the content). To do this, we will use ODBC (Open DataBase Connectivity) or OLE DB connections. Databases allow you to store data. All data is organized into two-dimensional tables in what is called a relationship. Each row ...
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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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