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Explain Dynamic Two-Phase Locking
Here a transaction locks a data item instantly earlier than any operation is applied on the data item. After finishing all the operations on all the data items, it releases all the locks. An instance of dynamic 2PL is as following
X(X)
Read (X)
X=X+M
Write (X)
X (Y)
Read (Y)
Y=Y+N
Write Y
Unlock (Y)
Unlock (X)
Extend your CREATE TABLE statement from problem 3 with referential integrity constraints. Updates and deletes on related rows are restricted. 6. From examination of the sample data
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Describe the storage structure of indexed sequential files and their access method. Ans: Index offers a lookup capability to rapidly reach the vicinity of the desired record.
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