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WRITE SHORT NOTES ON INDEX STRUCTURE OF FILES?
There are two basic parts of indices
1. Ordered indices
2. Hash indices
Every technique must be evaluated on the basis of these factors:
Ø Ordered indices
Ø Primary index
Ø Dense and sparse indices
Ø Multilevel index
Ø Index update
Ø Secondary indices
B+-Tree index files
B+-Tree index structure is the most widely used of various index structures that maintain their efficiency despite insertion and deletion of data.
Ø Structure of B+-Tree
Ø Queries on B+-Tree
Ø Update on B+-Tree
Ø B+-Tree file organization
Ø B-Tree index files
Consistency: This property makes sure that a complete transaction implementation takes a database from one consistent state to another consistent state. If the transaction fails e
You are required to program (in a high level language such as C, C++, Java) and implement a cache simulator which will have the following inputs and outputs:- INPUTS
What is a view? How it is related to data independence? A view might be thought of as a virtual table, that is, a table that does not really exist in its own right but is inste
Create a view emp_dep containing e_name and number of dependents from the tables employee and dependent of (i) CREATE VIEW emp_dept AS SELECT ename, COUNT(*) FROM employee, dep
What are the physical characteristics of magnetic disks? Ans: A magnetic disk is a circular plate or platter of plastic or metal that is coated with magnetizable material lik
Explain the Weak Entity Set An Entity set which does not have sufficient attribute to make a primay key is known as weak entity set. For instance, dependents of an employee in
Concatenation operator Example : Printing name and job as one string as column name employees: SELECT ENAME||JOB "EMPLOYEES" FROM EMP;
HOW TO SOLVE THE LP Problems by simplex method?z=x1+-3x2+2x3
Briefly describe concurrency execution? Lock - based protocols Locks There are several modes in which a data item may be locked in this section we restrict our attention
Update Anomaly : This anomaly is occurred due to data redundancy. Redundant information makes updates more complex since, for example, varying the name of the instructor of MCS-014
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