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What is a Transaction? A transaction is an event which happens on the database. Generally a transaction reads a value from the database or writes a value to the database. If y
State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its
Foreign Keys and NULL Let us take the relation: DEPT DEPT ID DNAME BUDGET D1 M
Table_Name( attribute_1, attribute_2, attribute_3, ….. ,attribute_x) Primary Key ( attribute_1, attribute_2) Foreign Key attribute_4 References Table_Name_2 (repeat for each fore
Name the various privileges in SQL? A) Delete B) Select C) Insert D) Update
Which model is record based logical model? Network Modelis basically known as record based logical model.
Explain the Deferred Update The deferred update methods do not physically update the database on disk till after a transaction reaches its commit point; after that the updates
Benefits of using heuristics
what is lossless & dependency preserving decomposition ?
Describe Object Relational model ? Object Relational Model - This model combines the characteristics of both relational model and object oriented model. It extends the tradit
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