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why are older data models are being replaced by new data models
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
Competition entrants can be either Individuals, or Teams. A Team is usually sponsored by a business, and, in that case, the team members would all wear T-shirts with the sponsoring
draw er diagram using entities crop,employee,department,plot,cultivation plan,machinery,seed,fertilizer
Deadlock And Its Prevention: As seen earlier, though two phase locking protocol handles the trouble of serialisability, but it causes some troubles also. For instance, consider th
What are the states of transaction? The states of transaction are:- a) Active b) Partially committed c) Failed d) Aborted e )Committed f) Terminated
These are designed to reduce the effects of a database failure and make sure a database is restored to a consistent state if a failure does arise. Manual backup/restore utilities n
Explain the Functional Mode with help of an example. Functional Model The functional model shows a computation and functional derivation of data values in it without ind
Which data manipulation command combines the records from one or more tables ? JOIN data manipulation command combines the records from one or more tables.
Some disadvantages of File Oriented System ?
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