DWhat should I read? Any links.. on checking if changes were made?

Hi All,
I need to record to an audit table everything that was changed at time of submitting a form.
I could capture every value at load - BUT I see there are statuses of:
I - Inserted
U - Updated
R - Reset
How do I access these? Are they solid, reliable?
What should I read? Any links to examples?
Thank you, Bill..

need to record to an audit table everything that was changed at time of submitting a form
The most reliable way to do this is in a row-level trigger on the table.
create or replace trigger t1
after insert or update or delete
on table mytable
for each row
begin
access :old.col1 and :new.col1, if they are different, log to a table.
end;See http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:59412348055

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    9. It seems to be a common belief that the built-in Application Firewall acts as a barrier to infection, or prevents malware from functioning. It does neither. It blocks inbound connections to certain network services you're running, such as file sharing. It's disabled by default and you should leave it that way if you're behind a router on a private home or office network. Activate it only when you're on an untrusted network, for instance a public Wi-Fi hotspot, where you don't want to provide services. Disable any services you don't use in the Sharing preference pane. All are disabled by default.
    10. As a Mac user you don't have to live in fear that your computer may be infected every time you install software, read email, or visit a web page. But neither should you assume that you will always be safe from exploitation, no matter what you do. The greatest harm done by security software is precisely its selling point: it makes people feel safe. They may then feel safe enough to take risks from which the software doesn't protect them. "Hmmmm, this torrent is a crack of that new game I want. I think I'll download it. It could be a trojan, but the antivirus will warn me if it is." Then they wonder why their Mac is so slow all of a sudden. It's slow because it's running flat out mining Bitcoins for a hacker who has already sold their credit card number and banking passwords to a criminal gang. Maybe a week later the antivirus does warn them, but what good does that do?
    Nothing can lessen the need for safe computing practices.

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