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Question (a) Concurrent access to data from a database is a normal part of application program usage. Describe three approaches to concurrency control (b) Distinguish among
What is the difference between a key and a superkey? Key - A key a single attribute or a combination of two or more attributes of an entity set which is used to identify one
what is meant semantic query optimization? how does it differ from other query optimization techniques?
Why a report generator is used ? Report generator is used for print files on paper.
The Conceptual Level or Global level The conceptual level presents a logical view of the complete database as a unified whole. It permits the user to bring all the data in th
Using a database design approach of your choice, produce a logical design for Pharma. 1) Your answer must consist of ONE the following: An entity-relationship (ER) diagra
Define page. The database is partitioned into some number of fixed-length blocks, which are referred to as pages.
what is union compatable?
Attributes that are directly kept in the data base. For example, 'Birth date' attribute of a person. Derived Attributes that are not stored directly but can be derived
What are called index-sequential files? The files that are ordered sequentially with a primary index on the search key are known as index-sequential files
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