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Objects becoming INVALID !!!!

Consider you are working on a front-end change (.net packages or Java libraries) and you are compiling the objects. Say, the code you newly introduced makes call to DB packages which have not been touched.
When rebuilding the front-end changes, you will see all the Called-packages becoming INVALID. 

If this is the case, you need to check the REMOTE_DEPENDENCIES_MODE parameter's value.
If it is TIMESTAMP, then change it to SIGNATURE to avoid such issues.

You can do this in the following way if you have permission for Alter System .

ALTER SYSTEM SET REMOTE_DEPENDENCIES_MODE = SIGNATURE;

Happy learning!

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