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Explain different categories of failures that occur in Oracle database?
Categories of Failures - In Oracle database subsequent types of failures can occurred: Statement Failure• Bad data type• Insufficient space Insufficient Privileges (e.g., object privileges to a role) User Process Failure• User performed an abnormal disconnect• User's session was abnormally terminated• User's program raised an address exception User Error• User drops a table• User damages data by modification Instance Failure Media Failure• User drops a table• User damages data by modification Alert Logs• Records informational and error messages• All Instance startups and shutdowns are recorded in the log
Need a sample of a clinic database relationships
Why older data models are being replaced by new data modelling 100 words accepted#
Express the properties of Strings? Strings can be case sensitive (or not) which can change the outcome of string operations. You can evaluate whole strings \ just part
Define and differentiate between ordered indexing and hashing. Ans: Ordered indexing: To gain fast random access to records in a file, we can make of an index structure. Every
What is Outer join? They can be employed while we want to keep all the tuples in R, or all those in S or all those in both relations in the result of the JOIN in spite of of w
What is property - properties of a database ? It is an integrated collection of logically related records. It consolidates separate files into a common pool of data records and
Question : (a) Data mining is one of the best ways to analyse data and using software method, hidden and unexpected patterns and relationships in sets of data can be extracte
Differentiate between Key and superkey? Key and superkey - A key a single attribute or a combination of two or more attributes of an entity set in which is used to identify o
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
What is 2NF? A relation schema R is in 2NF if it is in 1NF and every non-prime attribute A in R is fully functionally dependent on primary key.
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