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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
joins
What is De-normalization? De-normalization is the method of attempting to optimize the performance of a database by adding redundant data. It is sometimes essential because cur
Type of views : Simple views and Difficult Views Feature Simple Views Complex Views Number of tables One
When is a transaction rolled back? Any changes that the aborted transaction made to the database must be uncompleted. While the changes caused by an aborted transaction have be
Distributed Database Management System
complete er diagram of textile industry management
What are the time stamps associated with each data item? W-timestamp (Q) denotes the largest time stamp if any transaction that implemented WRITE (Q) successfully. R-timesta
Describe Parameteric end users? Parametric end users might be given update access, but are commonly not permitted to change the structure of data.
Although how will the system recover The selection of REDO or UNDO for a transaction for the recovery is completed on the basis of the state of the transactions. This state is
Consistency error : These errors happen due to the inconsistent state of database caused may be due to wrong implementation of commands or in case of a transaction abort. To overc
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