Worth to use Flashback and useful?

I'm new in oracle system design and very confused.
In newer version of Oracle, flashback technology was introduced. If my user won't call DBA to rollback some data suddenly, what is the purpose of it?
Even if a user want to flashback some data, there may be many data dependence or data integrity problems.
Also, if the db_recovery_file_dest_size is not enough within db_flashback_retention_target somehow, there may be error "ORA-38700: Limit of %s flashback database logs has been exceeded" which affects the daily operation.
Unless the size of UNDO and REDO Logs are enough, it is not worth to maintain the flashback feature, isn't it?
Thanks in advance!

Anothony,
Flashback and Flashback database are two different things , made to recover from two different kind of erros. Its indeed correct to say that Flashback is related to Undo and there should be a sufficient size for the Undo to be available. But assume a situation where a logical change, for example, all teh salaries have been made to zero, will your user would wait for 4 days to come to know about it? I guess not. The default size of Undo retention, on which Flashback is based primarily , is for 900 seconds(15 minutes). If you need more bigger time frame than that, you can always go for a larget sized Undo space.
The retention target that you have mentioned for Flashback, is NOT for the statndard Falshback but for the Flashback Database technology, a completely diffetent thing to recover or rewind the entire database which have undergone massive logical corruptions. The default for this is False that means the database is not in the Flashback mode by default. And this setting doesn't rely upon the setting of teh undo retention as a completely different process writes the records to the Flb files of the Flashback log and maintains it for the retention period that you would specify in the target parameter. This is again set to a high and almost suffificient value, 1 day, which should be enough for a db. Redo logs won't take part in the Flashback technology.
The only feaure that you would enable explicitly is Flashback Database, rest all is by default maintained by Oracle implicitly. I don't see any good in going back to RBS in the current era. And if you are using AUM, than you are going to have Flashback technology already on for you. Yeah, you use it or not, that depends on you and on your users.
HTH
Aman....

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I hesitate to answer your question because you are not doing a good job of keeping the forum clean :
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Please consider closing some of you old answered questions and rewarding those who helped you.
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