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Why are cursors necessary in embedded SQL?
A cursor is an object used to store the output of a query for row-by-row processing through the application programs. SQL statements operate on a set of data and return a set of data. Instead, host language programs operate on a row at a time.
The cursors are used to navigate by a set of rows returned through an embedded SQL SELECT statement. A cursor could be compared to a pointer.
Explanation on Data Sharing?
System R was developed and designed over a period of 1974-79 at IBM San Jose Research Company. Its purpose was to illustrate that it is possible to create a Relational System tha
Write short notes on transaction state? A transaction may not always complete its implementation successfully such a transaction is termed aborted A transaction must be in o
What is a Phantom Deadlock? In distributed deadlock detection, the delay in propagating local information might cause the deadlock detection algorithms to recognize deadlocks
what is Lossless-join decomposition
Difference between LEFT OUTER JOIN and RIGHT OUTER JOIN In left outer join tuples from the left-hand-side relation which do not match any tuple in the right-hand-side relation
triggering
What are stored-procedures? And what are the advantages of using them? Stored procedures are database objects that perform a user defined operation. A stored procedure can have
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
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
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