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Define Direct file organization?
The direct file organization is employed to enhance the performance in accessing the records than sequential file organization. In direct file organization, the key value is mapped straight to the storage location. The common method of direct mapping is by carrying out some arithmetic manipulation of the key value. This procedure is called hashing. While using this organization, an application like on-line transaction processing system can be designed that is why the centralized data are not only instantly accessible but are all the time up-to-date.
Explain P command in the respect of QBE? P: It is the command in which is used to print (logically display) the value of the attribute in whose cell it is writ
Explain I command in QBE ? I : It is the command in QBE that is used to insert tuple (s) into the database
Discuss deferred update technique of recovery. What are the advantages? Ans: The deferred update methods do not physically update the database on disk till after a transact
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What is DML compiler? DML Compiler: Translates DML statements in a query language within low level instructions understandable through the query evaluation engine. Attempts to
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The File Based System File based systems are an early attempt to computerise the manual filing system. For example, a manual file can be set up to hold all the correspondence r
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
Hot Backup: Some sites cannot terminate the database while creating a backup copy of the files. The cold backup is not a reliable option. So different kinds of backing up database
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