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Lock Based Protocol
A lock is nothing but a mechanism that tells the DBMS whether a particular data item is being used by any transaction for read/write purpose. As there are two types of operations, i.e. read and write, whose basic nature are dissimilar, the locks for read and write operation might be behave differently.
Read operation performed by dissimilar transactions on the same data item poses less of a challenge. The value of the data item, if constant, can be read by any number of transactions at any given time.
how many hourse have been spent on a certain project
can you please explain with the help of suitable example the difference between conflict equivalence and conflict serializability?
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Illustrate how you can use QBE to perform logical AND and OR operation
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