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What is transaction?
Collections of operations that form a single logical unit of work are known as transactions.
write-set(T): Each data items that are written by a transaction T
Determine the Other System Design Issue How to realise subsystems; through hardware or software? How is object model mapped on chosen hardware software? Mapping
what is union compatable?
A Functional dependency is described by X Y between two groups of attributes Y and X that are subsets of R specifies a constraint on the possible tuple that can make a relation
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
A file manipulation command that extracts some of the records from a file is called ? A file manipulation command that extracts some of the records from a file is called SELECT
why are older data base model are being replaced by new data model
distributed quey processing
DROP TABLE Command: When an existing object is not needed for further use, it is always better to eliminate it from the database. To remove the existing object from the databas
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