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Objectives
Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level
The Concurrent Transactions Almost every commercial DBMS support multi-user environment. Therefore, allowing multiple transactions to proceed concurrently. The DBMS must make
Synonyms It allows short names or alternative names for objects. Example : CREATE SYNONYM D30 FOR EMPD30; Now if we give command:
In E-R Diagram how relationship type is represented ? In E-R Diagram relationship type is represented as a Diamond.
What is persistency? Persistency ensures which data is stored and that after the object is no longer available (program stops running) the data will be available to other users
What is a super key? A super key is a set of one or more attributes that collectively permits us to recognize uniquely an entity in the entity set.
Describe log based recovery The most usably structure for recording data base modification is the LOG the log is a sequence of log records recording all the update activities i
what is difference between circular inked lust and grunded linked list
Define tuple variable? Tuple variables are used for comparing two tuples in the same relation. The tuple variables are explained in the from clause by way of the as clause.
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 model is an ex
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