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What are the various properties of Relational tables?
Relational tables have 6 properties:
1. Each row is unique.
2. Column values are of the same kind.
3. Values are atomic.
4. Sequence of columns is insignificant.
5. Sequence of rows is insignificant.
6. Each column should have a unique name.
Describe the nested-loop join and block-nested loop join. Ans: The block nested- loop join algorithm is as described below: for every block B r of relation R do beg
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WHAT IS DBMS
Explain data dictonary on oracle ? Data Dictionary - Data dictionaries are the system tables in which contain descriptions of the database objects and how they are structured.
Explain the Natural join Natural join is a binary operator which is written as (R* S) in which R and S are relations. The effect of the natural join is the set of all combinati
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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
In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
What are the Constituents of File? Also elaborates all the possible file operations? A file is organised logically as sequence of record. These records are mapped onto disk blo
Explain the Log Based Recovery Method? The system log that is generally written on stable storage consists of the redundant data required to recover from volatile storage failu
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