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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
Timestamps For Read operations: If TS (T) If TS (T) >= W-timestamp (Q), then the transaction T is trying to read a value of data item Q which has been written and committed
Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
What are attributes? Give examples. An entity is shown by a set of attributes. Attributes are descriptive properties possessed by every member of an entity set. Example: pos
For the relations R and S given below: R S A B C 1 4 7 2 5 8 3 6 9
Determine the steps of path in association network You can analyse use of paths in association network in the following steps: Examine every operation and see what asso
Question : Object-Oriented Database (OODM) is defined as a logical data model that captures the semantics of objects supported in object-oriented programming. An Object-Oriente
Database Manager It is the interface among low-level data, queries and application programs. Databases typically need a large amount of storage space. It is kept on disks, as
Explain the conventions for displaying an ER schema as an ER diagram? An E-R Diagram scheme might describe certain constraints to that the contents of a database must conform.
Differentiate between logical database design and physical database design. Show how this separation leads to data independence? Basis Logical Databas
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