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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 the difference between link and reference? The fundamental difference between links and references is that links are symmetrical on the other hand references refer only
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
brief history,definition,current trends and future trends if any of data fragmentation
Strict 2PL :Though, this basic 2PL suffers from the trouble that it can result into loss of isolation / atomic property of transaction as theoretically speaking once a lock is rele
Consider an information system designed for an online company which provides IT products and services These include desktops, laptops, networking products, IT books, parts, and
State the data flow diagram of functional model Any action initiated by transition in the state diagram can be extended into an entire data flow diagram in functional model. Th
In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.
You are to write a property management database program that allows a real estate agent to view, add, search, and save property listings. The program is to do the following: 1.
In the ER diagram, one example of subclassing is depicted following the Services entity. The subclasses Item Based and Time Based are created. The entity Services gains the attribu
what is Mapping Constraints? with examples
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