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Explain data abstraction?
Data abstraction Data abstraction is a methodology in which enables us to isolate how a compound data object is utilized from the details of how it is constructed from more primitive data objects.
why three level architecture had been developed/
Control as State within Program 1. The term control exactly means to check effect of input within a program. For illustration, in Figure, after the ATM card is inserted (a
how to construct labelled precedence graph for view serialiability.please explain insteps with one solved examples
what are the reasons having variable length records
what are information system hirarchy?
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
Heap files (unordered file) Mostly these files are unordered files. It is the easiest and most basic type. These files having of randomly ordered records. The records will have
how to data store?
We face problem of stock Opening balance and closing balance in Minus
What are the key features of Oracle? Key features of Oracle are as follows: • Read Consistency • Concurrency • Locking Mechanisms • Quiesce Database • RAC • Portability
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