System Analysis and Design
The term Parallel Run refers to

the concurrent operation of an existing system and a new system
None of these
All of these
the same job run on two different computer to test their speeds
the processing of two different jobs initiated from two terminals.

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System Analysis and Design
Data Definition Language (DDL)

specifies for the DBMS what is required; the techniques used to process data
describes how data are structured in the data base
all of the listed here
determine how data must be structured to produce the user's view

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