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Mixed fragmentation:Sometimes, horizontal fragmentation or vertical fragmentation of a database schema by itself is insufficient to sufficiently distribute the data for some applications. In its place, mixed or hybrid fragmentation is needed. Mixed fragmentation having of a horizontal fragment that is vertically fragmented, or a vertical fragment that is then horizontally fragmented.
What does conceptual design work? A conceptual design involves modelling independent of the DBMS.
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
Which database object does not physically exist? A view database object does not physically exist.
Derived horizontal fragmentation: Some applications may include a join of two or more relations. If the relations are stored at dissimilar locations, there may be a major overhead
Write short notes on transaction state? A transaction may not always complete its implementation successfully such a transaction is termed aborted A transaction must be in o
complete assignment on the above title.
Describe integrity and security? a) Domain constraint b) Referential integrity A value that appears in one relation for a given set of attributes also appear fo
Which method is used to key transformation ? A hash method is used to key transformation.
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
What is advantage of two-way association? Two-way association advantages are following: a) Independent of the classes. b) Useful for existing predefined classes that are
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