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What are the advantages of having an index structure?
Ans: The index structures commonly provide secondary access paths, which offer alternative ways of accessing the records without influencing the physical placement of records on disk. They allow efficient access to records based upon the indexing fields that are employed to construct the index. Indexes are used to enhance the efficiency of retrieval of records from a data file.
Define the Wait for graph Ans: The wait-for-graph is a directed graph and consist of nodes and directed arcs; the nodes of the graph are active transactions. An arc of the grap
What is known as clustering file organization? In the clustering file organization, records of several dissimilar relations are stored in the similar file.
Why do you go for sorting your query results? SQL SELECT command to fetch data from MySQL table. Whenever you select rows, the MySQL server is free to return them in any order
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
What do you understand by transitive dependencies? Define with an example any two problems that can take place in the database if transitive dependencies are available in the datab
Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
Using Relational Algebra which query finds customers, who have a balance of over 1000 ? Using Relational Algebra Π Customer_name( σ balance >1000(Deposit)) is query to find cu
how to find entities
The State of NewYork certifies firefighters throughout state and keep track all of them, as well as of the state’s fire departments. Each fire department has unique department numb
What is Structured Query Langauge (SQL)? SQL is a powerful set-oriented language which was formed by IBM research for the databases that adhere to the relational model. It havi
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