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What is disadvantage of multiple inheritances?
There is potential ambiguity if the similar variable or method can be inherited from more than one superclass.eg: student class might be having a variable dept identifying a student's department, and the teacher class might correspondingly have a variable dept identifying a teacher's department.
the of super market system done in database
give some example real-life situations where DBMS are most suiitabe
What is Stored Procedure? A stored procedure is a named group of SQL statements that have been previously formed and kept in the server database. Stored procedures accept input
Define the basic operations of the relational algebra? Ans: Basic operators of relational algebra are: 1. Union (∪) - Selects tuples which are in either P or Q or in bot
How does the two phase protocol ensure serializability in database schedules? Ans: A transaction is termed to follow the two-phase locking protocol if all locking operations
The following data are required to be stored by a family physician. Family#, FamilyAddress, Patient#, PatientName, ServiceCode, ServiceFee, ServiceDate A family can have seve
Using your cache simulator and using smalltex.din as your memory trace determine the total miss rate, compulsory miss rate, capacity miss rate, and conflict miss rate for the follo
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
Explain concurrency control? Concurrency control Oracles multiversion concurrency control varies from the concurrency mechanism used by some other data base vendors. Read
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
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