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Explain data independence ?
Data independence is the capacity to modify the schema at one stage of a database system without having to change the schema at the further level. The three-schema architecture permits the feature of data independence. Data independence occurs since while the schema is changed at a few level, the schema at the further level remains unchanged; only the mapping among the two levels is changed.
statical data
The following variant of the primary copy asynchronous-update replication protocol has been proposed for totally replicated systems. (a) A transaction executing at site A updat
Northwind Pty Ltd sells a variety of food products throughout the world. They want to use the reporting features of SAP''s Business Information Warehouse to better understand thei
Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational mo
Do NOT use the timestamp type. Use separate date and time data types only. Figure out how to define an SQL insert statement that uses built-in SQL (or MySQL) functions to define
Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.
The basic merits of decomposition. The Advantages of Decomposition 1. Separate person can work on each subsystem. 2. A particular software engineer can specialize in a
Determine the rule that a value of a foreign key should appear as a value of some particular table is called a Ans: Referential constraint. The rule that a value of a fo
What is Object Oriented model? This model is based on collection of objects. An object has values stored in instance variables with in the object. An object also having bodies
Explain weak and strong entity type ? Weak and Strong entity type: An entity set which does not have a primary key is referred to as a weak entity set. The existence of a wea
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