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What is the benifit of using 'upmerge' command introduced in oracle 9i &amp;&nbsp;how it works?<br />
it is my open book bonus question in University i need it's expert answer as soon as possible. 
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What is the benifit of using 'upmerge' command introduced in oracle 9i & how it works?
it is my open book bonus question in University i need it's expert answer as soon as possible. 

Upmerge

Oracle is an object-relational database management system. It supports a large number of languages and application development frameworks. Its primary languages are SQL, PL/SQL and Java, but it also includes support for C and C++. Oracle also has its own enterprise modules and application server software.