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Explain I command in QBE ?
I : It is the command in QBE that is used to insert tuple (s) into the database
What is DAG? The class-subclass relationship is shown by a directed acyclic graph.eg: employees can be temporary or permanent. We might be create subclasses temporary \and perm
Explain TPS concurreny executions stating their advantages in online business advancement
Exclusive lock It is asked for by a transaction on a data item that it wants to update. No other transaction can put either a shared lock or an exclusive lock on a dat
The following variant of the primary copy asynchronous-update replication protocol has been proposed for totally replicated systems. (a) A transaction executing at site A updat
How persistent programming languages differ from traditional programming languages? Database languages vary from traditional programming languages in that they directly manipul
In which format database schema is written ? Data base schema is written in the DDL format.
Properties of a Transaction A transaction has four main properties. These are: Atomicity Consistency Isolation or Independence Durability or Permanen
Explain heap file with advantages? Heap File is an unordered set or a group of records, stored on a set of pages. This class gives basic support for inserting, updating, select
Explain the Difference between DROP and DELETE DELETE deletes one or more than one tuples of a particular relation from the database. DROP is employed to remove a table from th
What are the several forms of identity? a) Value b) Name c) Built-in
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