D DineshPadhan New Member Dec 2, 2023 #1 Can Anyone share important Questions of BCA 3rd semistar Question?
D DineshPadhan New Member Dec 2, 2023 #2 I have Data Science Questions and answers: Unit I: What are the advantages and disadvantages of using a database approach over a traditional file processing system? Explain the three schema architectures of a database system and give an example. What are the components of an E-R model and how are they represented graphically? Unit II: What are the differences between supertype, subtype, specialization, and generalization in an enhanced E-R model? Give an example of each. What are the structural and operational constraints on a relationship type? Explain how to transform an EER diagram into a relational schema. Unit III: What are the basic operations of relational algebra and how are they used to manipulate relations? What are the differences between relational algebra and relational calculus? Write a basic SQL query to retrieve data from a table and apply some conditions and aggregations to it. Unit IV: What are the factors that influence the choice of a file organization and an indexing technique for a database? Compare and contrast the ISAM and B+ tree indexing methods. What are the advantages and disadvantages of static, extendible, and linear hashing? Unit V: What are the ACID properties of a transaction and why are they important for ensuring the consistency and reliability of a database? What are the problems that can arise from concurrent execution of transactions and how can they be prevented or detected? What are the basic principles of lock-based concurrency control and how can deadlock be avoided or resolved?
I have Data Science Questions and answers: Unit I: What are the advantages and disadvantages of using a database approach over a traditional file processing system? Explain the three schema architectures of a database system and give an example. What are the components of an E-R model and how are they represented graphically? Unit II: What are the differences between supertype, subtype, specialization, and generalization in an enhanced E-R model? Give an example of each. What are the structural and operational constraints on a relationship type? Explain how to transform an EER diagram into a relational schema. Unit III: What are the basic operations of relational algebra and how are they used to manipulate relations? What are the differences between relational algebra and relational calculus? Write a basic SQL query to retrieve data from a table and apply some conditions and aggregations to it. Unit IV: What are the factors that influence the choice of a file organization and an indexing technique for a database? Compare and contrast the ISAM and B+ tree indexing methods. What are the advantages and disadvantages of static, extendible, and linear hashing? Unit V: What are the ACID properties of a transaction and why are they important for ensuring the consistency and reliability of a database? What are the problems that can arise from concurrent execution of transactions and how can they be prevented or detected? What are the basic principles of lock-based concurrency control and how can deadlock be avoided or resolved?
