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Illustrate different types of Locks in SQL Server.
There are three kinds of locks in SQL Server
i.) Shared locks - These are used for operations which don't allow any update or change of data. For example SELECT.
ii.) Update locks - These are used when SQL Server wants to modify a page. Update page lock is then promoted to an exclusive page lock before actually making changes.
iii.) Exclusive locks - they are used for data modification operations. For example UPDATE, INSERT, or DELETE.
What is the use of group by clause? Group by clause is used to apply aggregate functions to a set of tuples. The attributes given in the group by clause are used to
Describe Participation Constraints? Participation Constraints - The participation constraint exacts whether the existence of an entity depends on its being related to another
Secondary Indexes Let consider the student database and its clustering index and primary (only one will be applicable at a time). Now consider the state when the database is to
Question: In a multi-user database environment, locking mechanisms can be used to solve the three basic problems of concurrency. On the other hand, however, locking may also le
Example :; transfers transfer_amount from x's account to y's account ; Supposes x&y both accounts exist TRANSACTION (x, y, transfer_amount) Start transaction IF X AND Y
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Haw does it work one database application
There are a number of possible solutions to the open ended brief. One of the simple ones is shown here without the PKs and FKs. It is important to think of how a number of tasks
Although, the essential features of E-R diagrams are enough to design many database situations. Though, with more difficult relations and advanced database applications, it is need
basic structure of xml
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