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I have two primary reasons for avoiding triggers: Hopefully the first reason to avoid triggers, the maintenance headache, is fairly easy to see.Suppose you are working on someone else’s project, because you have inherited someone else’s work. When you run an update and see “1 row processed,” 500 other things may also have happened. UPDATE bank_transactions SET txn_number = 'NEWTXN8080' WHERE txn_id = 1; UPDATE bank_transactions SET txn_number = 'NEWTXN9595' WHERE txn_id = 2; -- output 1 rows updated. Dhaval Dadhaniya is a software engineer by profession and reader/writter by passion. CREATED_DATE); END; --Inserting values INSERT INTO BANK_TRANSACTIONS values ('1','TXN1234','Peter Thomas','12-MAY-2017','HR',sysdate); INSERT INTO BANK_TRANSACTIONS values ('2','TXN9999','Jemes Patel','10-JUN-2016','HR',sysdate); select * from BANK_TRANSACTIONS; --updating values.Say you have a bit of code or better yet a stored procedure that represents a transaction, and you read it. I get it.” But if you are on a system laden with triggers all over the place, you won’t have gotten it at all—you’ll have gotten it wrong, at best. More than once, I’ve received an e-mail similar to the following (this is a cut-and-paste—I did not make this up): We have a problem when updating a column.
Now, whenever possible, I will go very far out of my way to avoid a trigger.
When we retrieve that column, the query does not return the updated column values, but other columns are being updated and we are able to see those values. It happens more often than you might think, in real life.) I looked at their trigger and decided immediately that I did not like it.
First, their NAME attribute should have been a column in a view (or, in Oracle Database 11, a virtual column).
Also note that these user logon/logoff triggers are best used for applications that utilize time-stamped users, which means those users who are given a unique Oracle user ID when they access the application.
Applications that do not utilize time-stamped Oracle user IDs (SAP, People Soft) may not benefit greatly by using these logon/logoff triggers.Our technologist looks at trigger maintenance and implementation challenges.