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How the time stamps are implemented
Use the value of the system clock as the time stamp. That is a transaction's time stamp is equivalent to the value of the clock when the transaction enters the system.
Use a logical counter that is increased after a new timestamp has been assigned; that is the time stamp is equivalent to the value of the counter.
write an SQL statement to create the database in MYSQL server
employee(empid,empname,dept,telno,mobno, add,sssno,tinno,WEdates,WEcomp,WEadd,WEpos,WEres) this is a employee record which is need to be normalize.the WE means work experience
Define Assertions in SQL a. An assertion is a predicate that is expressing a condition we wish the database to always satisfy. b. Domain constraints, functional dependency
courier company er-diagram
What is a hash index? A hash index organizes the search keys, with their associated pointers, into a hash file structure.
Describe the various types of Online Analytical Processing (OLAP) tools and briefly discuss how the support common analytical operations.
If the insertion violates one or more constraints, then two alternatives are available: Default option: - Insertion can be discarded and the reason of refusal can also be ex
In how many parts events are classified Events are classified as four types in UML 1. Signals 2. Calls 3. Passing of Time 4. Change in State
State the terms Designing the database and Normalization Designing the database: Out of the ERD we have formed, it is very easy to verify the tables, the attributes which the
Write the motivations led to development of OO-DBMS? 1. Programmer frustration with RDBMSs. 2. Requirement for special features.
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