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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
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
What is a trigger
Compare the Nested-loop join and block-nested loop join Ans: Nested loop join - It is costly as worst case cost, no. of block accesses needed is n r * b s + b r where b
Process of implementing system design in dynamic models There are three essential approaches to implementing system design in dynamic models. These approaches are as below:
Explain the three data models namely relational, network and hierarchical and evaluate their relative advantages and disadvantages. Hierarchical Model: In hierarchical model, da
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Write a short note on QBE? Stands for "Query By Example." QBE is a feature involved along with various database applications which gives user-friendly techniques of running da
Before we talk about the relational model in more detail, let us first define some very basic terms used in this model. Tuple Every row in a table shows a record and is cal
What are the function of DBA?
Define the Boyce-Codd Normal Form with instance and also Compare BCNF and 3NF. Ans: BCNF: For each functional dependency X->Y in a set F of functional dependencies over relati
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