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What are the ways in which the variable-length records arise in database systems?
Storage of many record types in a file.
Record types that permit variable lengths for one or more fields.
Record types that permit repeating fields.
Define union compatibility? Explain why INTERSECTION of two relations cannot be performed if they are not union compatible? Two relations R(A1, A2,-------, An) and S(B1, B2,--
Forward Recovery (Redo): In this system the committed changes made by a transaction are reapplied to a previous copy of the database. In simpler
What is DAG? The class-subclass relationship is shown by a directed acyclic graph.eg: employees can be temporary or permanent. We might be create subclasses temporary \and perm
A constraint named less_than_20 was defined on the field date_of_birth of table student. Delete this constraint. ALTER TABLE student DROP CONSTRAINT less_than_20;
management information system based on functional organisation
Q. Explain the terms key constraints participation constraints and mapping caradinalities in ER model. Participation Constraints : The participation of an entity set E i
Define the term Domain. For each n every attribute there is a set of permitted values known as the domain of that attribute.
Gaps in sequence values can happen when: - A rollback happens that is when a statement changes are not accepted. - When the system crashes - When a sequence i
explain in detail about time stamp orderting/
My cut off date is very soon in a Database subject and i dont know how to solve anything in it
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