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What is serializability? Explain its types?
The data base system must control concurrent implementation of transactions, to ensure that the data base state remains consistent. There are dissimilar forms of schedule equivalence they lead to the notions of
a) Conflict serializability
B) View serializability
Conflict serializability
We say that ii and I j conflict if they are operations by dissimilar transaction on the similar data item and at least one of these instruction is a write operations
SET concept is used in which type of modelling? SET concept is used in Network Model.
What type of view of total database content? Data base content Conceptual view of total database contain.
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
Describes the several relationship constraints through giving suitable example? Constraints on relationships: There are two kinds of constraints on relationships. 1) Mapping
I need help in doing my dbms project
What is known as a search key? An attribute or set of attributes used to look up records in a file is known as a search key.
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
Which types of data supported by MySQL for Time and Date formats? MySQL supports a number of time and date column formats: Some of them are 1) DATE 2) DATETIME 3) TIM
how to write a in a text and load it on mysql
What is Cross Product? Simply Cross product is Binary Operator
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