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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
create an e-r diagram usuing graphical dipicted software that could theoritically be used in resturant application
I need to Map an E-R diagram to a relational schema
What is meant by log-based recovery? The most widely used structures for recording database changes is the log. The log is a sequence of log records, recording all the update a
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Which two files are used during operation of the DBMS? Data dictionary and transaction log are two files used during operation of the DBMS.
The cross-section of twisted pair The cross-section of each and every strand of the twisted pair is π/4 square mm. A 10-km length of this type of material, with two strands per
Control Files : The redo and control files logs support the rest of the architecture. Every database must have at least one control file, although you have more than one to guard
what is entity in database system?
What are temporary tables? Temporary tables exist solely for a particular session or whose data persists for the duration of the transaction.
read-set(T) : Each data items that are read by a transaction T Timestamps : for all transaction T, the start-time and the end time are reserved for all the three phases.
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