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Explain about database system structure?
Storage manager
Authorization and integrity manager
Transaction manager
File manager
Buffer manager
Storage manager executes several data structure as a part of physical system execution
Data function
Data dictionary
Indices
The query processor
DDL interpreter
DML
Query evaluation engine
What is meant by software and hardware RAID systems? RAID can be executed with no change at the hardware level, using only software modification. Such RAID implementations are
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Discuss the types of integrity constraints in which must be checked for the update operations - Insert and Delete. Give examples. Insert operation can violet any of the subse
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These are the binary operations; i.e., each is applied to two relations or sets. These two relations can be union compatible excluding in case of Cartesian product. Two relations R
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Describe the two types of methods for retrieving rows in Python? Fetchone()- Returns the next row as a sequence Fetch all()- Returns the entire result set like a strin
Define the terms i) Entity type ii) Entity set Entity type: An entity type describes a collection of entities that have the similar attributes. Entity set: The set of all en
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What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
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