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What is a Name?
A user-supplied name is used for identity. This form of identity is used for files in file systems. The user gives every file a name that uniquely identifies it, regardless of its contents.
List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation
What is the difference between link and reference? The fundamental difference between links and references is that links are symmetrical on the other hand references refer only
Explain Two phase locking protocol A transaction is consider as to follow the two-phase locking protocol if all locking operations precede the first unlock operation in the tra
What is the purpose of storage manager? The storage manager is responsible for the following a) Interaction with the file manager b) Translation of DML commands in to low
What is schema
Write short notes on Schema diagram. A database schema along with primary key and foreign key dependencies can be depicted pictorially by schema diagram. Every relation appears
Explain natural join? Natural Join - Similar as equi-join except in which the join attributes (having similar names) are not involved in the resulting relation. Only one sets
What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.
Describe log based recovery The most usably structure for recording data base modification is the LOG the log is a sequence of log records recording all the update activities i
What is the use of sub queries? A sub query is a select-from-where expression that is nested with in another query. A common use of sub queries is to do tests for set membershi
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