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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 3nf
Explain the difference between the three storage types - volatile, non volatile and stable. Ans: Volatile storage: if storage media loses data while power goes off,
Define the concept of aggregation. Give two examples where this concept is useful. Ans: Aggregation transforms a relationship among the objects into a higher-level object. A
What is nested relational model? The nested relational model is an extension of relational model in which domains might be either atomic or relation valued.
to develop elrctronic database from manual forms
Introductory course and so does not require any fancy coding. I will provide a guidance document to help you in producing the solutions.
What is bucket overflow and how bucket overflow is handled through Over Flow Chaining or Closed Hashing? Ans: Bucket: unit of storage holding records. Bucket is a disk block
Log based recovery: Let us first describe the term transaction log in the context of DBMS. A transaction log is a record in DBMS that remains track of all the transactions of a dat
Concatenation operator Example : Printing name and job as one string as column name employees: SELECT ENAME||JOB "EMPLOYEES" FROM EMP;
how to write tables and drow E-R diagrams for hosiptal management system and how to normalize and cardinalities?
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