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explain exhausitively the problems associated with er diagrams with ellustrations
what problems are raised by the database? why is it so controversial? why is data quality an issue?
explain cascading rollback
Given the following set of functional dependencies {cf→ bg, g → d, cdg → f, b → de, d → c} defined on R(b,c,d,e,f,g) a. Is cf→ e implied by the FDs? b. Is dg a superkey?
What is known as a search key? An attribute or set of attributes used to look up records in a file is known as a search key.
is Chipo carrying his baby
Backward Recovery (UNDO): In this system the uncommitted changes made by a transaction to a database are undone. Instead the system is reset to the last consistent state of databa
example of embedded SQL query
Hardware failure : Hardware failures are the failures when some disk or hardware chip fails. This may result in loss of data. One such trouble can be that a disk gets damaged and
Timestamp Ordering Protocol A timestamp is a tag that can be attached to any transaction or any data item, which indicates a specific time on which the transaction or data item
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