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Briefly describe concurrency execution?
Lock - based protocols
Locks
There are several modes in which a data item may be locked in this section we restrict our attention to two modes
Ø Shared
Ø Exclusive
T1 : lock - x(B );
read(B);
B:=B-50;
write(B);
unlock(B);
Lock-x(A);
read(A);
A:=A+50;
write(A);
unlock(A).
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
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Design a gennalization and specialization hierarchy for an automobile sales company
external view of DBMS in healthcare department?
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Determine the Other System Design Issue How to realise subsystems; through hardware or software? How is object model mapped on chosen hardware software? Mapping
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
Selective replication: This is a combination of generating small fragments of relation and replicating them rather than a entire relation. The data should be fragmented on require
How many physical thing?
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