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Explain the Static or conservative Two Phase Locking:
Static (or conservative) Two Phase Locking: In this type of scheme, all the data items are locked earlier than any operations on them and are released just only after the last operation carried out on any data item.
X(X)
X (Y)
Read (X)
Write (X)
Read (Y)
Y = Y+N
Write Y
Unlock (X)
Unlock (Y)
In static 2PL, requests from other transactions for data items locked by the previous transaction will be delayed without need, so causing a serious impact on system performance.
Whenever the LIMIT clause will be used? LIMIT is used for the following kinds of problems: 1) Answering questions about first or last and largest or smallest 2) Splitting
A software contract and consultancy firm maintains details of all the various projects in which its employees are currently involved. These details comprise: Employee Numbe
Some disadvantages of File Oriented System ?
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a) Suppose we updated the catalog tables in real time, that is, after every update, insert, or delete SQL statement were executed-rather than only running RUNSTATS once every few
how oracle can be used
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