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Deadlock Prevention
One of the easiest approaches for avoiding a deadlock would be to obtain all the locks at the begin of the transaction. Though, this approach restricts concurrency very much, also you may lock some of the items that are not updated by that transaction (the transaction may contain if conditions).Therefore, better prevention algorithm have been evolved to stop a deadlock having the basic logic: not to permit circular wait to occur. This approach rolls back some of the transactions instead of letting them wait.
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
Vertical Fragmentation- Vertical fragmentation groups together only those attributes in a relation that are used jointly by various important transactions. A vertical fragment is d
Explain data abstraction? Data abstraction Data abstraction is a methodology in which enables us to isolate how a compound data object is utilized from the details of how it is
Removing a Synonym: DROP SYNONYM D30;
You are managing the following database system: • DBMS: Oracle 11g • OS: Sun Solaris • System architecture: Web-based application using ASP.Net • Purpose of Server: HR manage
What is called a query evaluation plan? A sequence of primitive operations that can be used to assess a query is a query evaluation plan or a query implementation plan.
Mixed fragmentation: Sometimes, horizontal fragmentation or vertical fragmentation of a database schema by itself is insufficient to sufficiently distribute the data for some appli
What is relational model feature? A relational model feature is much more data independence than some other database models.
Why is database design important?
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