Can we use transaction in trigger?

Because the trigger will already be operating within the context of a transaction, the only transaction control statements you should ever consider using in a trigger are ROLLBACK and SAVE TRAN.

What are the conditions under which we should avoid using triggers?

The Problems with Triggers

• Obscurity. When debugging, troubleshooting, or trying to find the root cause of a bug or what’s causing data modifications within complex systems, triggers are insanely easy for developers (and even DBAs) to forget about.
• Complexity.
• Performance / Scalability.

Are SQL triggers part of transaction?

The trigger is always part of the transaction for the action that fires the trigger. If an error occurs in the trigger that causes transaction rollback then the firing action will be rolled back too. Triggers implicitly have XACT_ABORT on.

Why are triggers a bad idea?

The difficulty with a trigger is that it does stuff “behind your back”; the developer maintaining the application could easily not realise it’s there and make changes which screw things up without even noticing. It creates a layer of complexity which just adds maintenance work.

What happens if trigger fails?

If a BEFORE trigger fails, the operation on the corresponding row is not performed. A BEFORE trigger is activated by the attempt to insert or modify the row, regardless of whether the attempt subsequently succeeds. Failure of a trigger causes the statement to fail, so trigger failure also causes rollback.

What happens if you don’t COMMIT a transaction?

9 Answers. As long as you don’t COMMIT or ROLLBACK a transaction, it’s still “running” and potentially holding locks. If your client (application or user) closes the connection to the database before committing, any still running transactions will be rolled back and terminated.

Should trigger be avoided?

When to Avoid Triggers Life is going to throw triggers at you regardless of if you try to avoid them or not, so you shouldn’t make it more difficult on yourself. Minimize your triggers by avoiding certain situations and behaviors such as not going to the bar or houses of friends who you used to use with.

Should you use triggers?

Triggers are useful if you need to be sure that certain events always happen when data is inserted, updated or deleted. This is the case when you have to deal with complex default values of columns, or modify the data of other tables. You can use external code as a trigger by using CLR triggers.

Are triggers executed in the same transaction?

All PostgreSQL triggers execute in the same transaction as the transaction that has triggered them.

Is it good to use triggers?

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.

Is it good practice to use triggers?

Using remote queries in triggers is a bad practice. Distributed queries have detrimental effects on performance and you should avoid this practice if possible.

Can a trigger fail?

A BEFORE trigger is activated by the attempt to insert or modify the row, regardless of whether the attempt subsequently succeeds. Failure of a trigger causes the statement to fail, so trigger failure also causes rollback.

When to use triggers in SQL Server?

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.

Does a trigger always have a transaction?

@meir Triggers always have a transaction. If one does not already exist when a trigger starts, one will be created for it. – RBarryYoung Apr 25 ’14 at 16:45 | Show 1more comment 8 Don’t rollback in a trigger and there is no need to start a transaction either.

How many non-trigger stored procedures can you have in sqlServer?

In SQLServer, you can have any number on non-trigger stored procedures but only 1 INSTEAD OF trigger per table. Triggers are a requirement for any complex data integrity rules.

Should database triggers be avoided?

Is it just someone’s personal preference, or should triggers be avoided (just like cursors) unless there is a good reason for them. The Wikipedia article on database triggers presents a good overview of what triggers are and when to use them in different databases. The following discussion is based on SQL Server only.