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Edition Based Redifinition, The key to onine application upgrade.
When upgrading an application or implementation based on PL/SQL
means in generally compile of the PL / SQL procedures.
During this compilationfase end users can not use the application:
they must wait until the entire change in the application is implemented.
During the implementation can be a bit unpredictable behavior.
In Oracle 11g Release 2, this problem is past: by utilizing Edition it is possible to live new code to implement and compile,
in one stroke current is made