Is there any technique to get notification on data updates.

Case:
*1.* Some common data set is being loaded to Application scope of an Enterprise Application (assume it's something just like a java-Hashtable or any other Map object which holds currency codes and currency rates respectively).
*2.* Another user updates database currency rates through any other application.
Line: -----
Question:
h4. "Is there any technique or oracle API that we can use to send a notification about the data upgrade, or directly fire an event so that it could upgrade the values of above mentioned Enterprise Application?"

Thanks a lot! (A reply within 2 minutes!!! Can't believe even)
These days I'm on a hard situation of shaking off the malicious coding of an existing Enterprise Application. I could do it for all the EJBs, Other java files, Servlets and HTML files within last few months. We could notice a significant improvement after that, and now It's time to use better SQL practices instead of what we have now in that applications.Unfortunatly, the programmers who has done this before have never used at least a 'StringBuffer (Can't use StringBuilder anyway as we still use Websphere IDE 5.1 with java 1.3) to append SQL query segments.They have just used '+' sign with long Strings.
So I wanted to use all the best practices while replacing them.
But I'm not someone who really have a good knowledge of 'PL/SQL'. So I really appreciate the help of you all, and Thanks for providing me information so quickly! They really helped me!
:-)

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Is there any technique to get notification on data updates.

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