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Database System Architectures
Database System Architectures

... Implementation Issues for Distributed Databases  Atomicity needed even for transactions that update data at multiple sites  The two-phase commit protocol (2PC) is used to ensure atomicity ...
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... Configuring and maintaining RAC (Real application Cluster) Servers as well as replication server on Oracle 9i and 10g Administrating all Netra, Fire, Sparc as well as HP Servers with Veritas volume management Configuring and managing SQL Server databases in Production house Providing training to dev ...


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... The July shipment of the Mutual Funds database is targeted for several noteworthy changes. • New Class Codes – Long requested, a new fund class identifier, CRSP_CL_GRP is being added to Fund Header and Fund Header History tables. • New Style Codes – CRSP has created a continuous history of style c ...
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... attributed to named poets (skalds), composed using highly intricate metrical forms (especially dróttkvætt) and complex poetic diction (especially kennings). The poetry tends to be preserved piecemeal in medieval manuscripts of prose narratives (sagas) and scholarly treatises — although there are sig ...
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... Participation: This will be based partly on class attendance and partly on class contributions (e.g. asking good questions, answering questions, etc.). If you need to miss a class, please send me an email, preferably before the missed class, stating the reason for your absence. At the end of the cou ...
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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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