Is it good to use trigger in SQL?
Because a trigger resides in the database and anyone who has the required privilege can use it, a trigger lets you write a set of SQL statements that multiple applications can use. It lets you avoid redundant code when multiple programs need to perform the same database operation.
Are SQL Server triggers bad?
Triggers are generally over-used in SQL Server. They are only rarely necessary, can cause performance issues, and are tricky to maintain If you use them, it is best to keep them simple, and have only one operation per trigger.
Are SQL triggers evil?
In my experience they are evil, because they can result in surprising side effects, and are difficult to debug (especially when one trigger fires another). Often developers do not even think of looking if there is a trigger.
Are DB triggers bad?
The problem with triggers is that they are executed even if you do not want them to. … Triggers can be a good choice if there is an external tool that access and inserts data to your database and you cannot access to code, but you need to add some functionality on insert, delete and update clauses.
What are the disadvantages of trigger?
Disadvantages(Problems) of Triggers
- It is easy to view table relationships , constraints, indexes, stored procedure in database but triggers are difficult to view.
- Triggers execute invisible to client-application application.
Why you should not use triggers?
Triggers can cause performance issues if not written carefully and not enough developers are knowledgeable enough to write them well. … Triggers are often slower than other means of maintaining data integrity, so if you can use a check constraint, use that instead of a trigger.
What triggers SQL?
A SQL trigger is a database object which fires when an event occurs in a database. We can execute a SQL query that will “do something” in a database when a change occurs on a database table such as a record is inserted or updated or deleted. For example, a trigger can be set on a record insert in a database table.
What happens when SQL trigger fails?
If the trigger fails, the original operation also fails. INSTEAD OF triggers replace the calling write operation. In these scenarios, the INSERT , UPDATE , or DELETE operation never occurs, and the contents of the trigger are executed instead.
What is the alternative for triggers?
One alternative you might want to look into are computed columns in SQL Server. If that matching is a pretty straightforward one (e.g. extract the character 10 through 14 from the string) or something like that, you could create a computed column to do so automagically – no trigger needed.
Do SQL triggers affect performance?
Yes, a table with a trigger will not perform as well as it would without it.
Are mysql triggers good or bad?
Using triggers is quite valid when their use is justified. For example, they have good value in auditing (keeping history of data) without requiring explicit procedural code with every CRUD command on every table. Triggers give you control just before data is changed and just after the data is changed.
Are Postgres triggers expensive?
AFTER triggers are more expensive than BEFORE triggers because they must be queued up until the statement finishes doing its work, then executed.