Question: Which Is Not Allowed In A Trigger?

Can we call stored procedure inside trigger in Oracle?

Yes you can fire a procedure from a Trigger.

But, keep in mind that trigger & procedur e should not acess the same table.

Just keep in mind that a trigger can fire for every row affected with a DML trigger.

So your stored procedure should be optimized or you could will run into performance issues..

For which of the following are triggers not supported?

For which of the following are triggers not supported? Explanation: In MySQL, the triggers are run only after the table modifications like insert, update and delete are run. Triggers are not supported for views. In order to create a trigger, the CREATE TRIGGER statement is used.

Are DB triggers bad?

They are often wrong. If data integrity is to be maintained no matter where the data change came from, triggers are a requirement and it is foolish to avoid them because some programmers are too ethnocentric to consider that something other than their prized application may be affecting things.

Can we call trigger manually?

no, you can’t call a trigger on sql server manually, if u want to execute trigger you have to genrate the event with which trigger is associated. … No we can’t execute trigger manually. It is fired automatically.

What is triggers and types of triggers?

Triggers are stored programs, which are automatically executed or fired when some events occur. Triggers are, in fact, written to be executed in response to any of the following events − A database manipulation (DML) statement (DELETE, INSERT, or UPDATE) A database definition (DDL) statement (CREATE, ALTER, or DROP).

What is trigger explain with example?

Trigger: A trigger is a stored procedure in database which automatically invokes whenever a special event in the database occurs. For example, a trigger can be invoked when a row is inserted into a specified table or when certain table columns are being updated.

Do triggers slow down database?

A trigger fires inside the transaction that modifies the data in the table. … The triggers of this type will not slow down operations, however, will ensure data coupling and integrity.

Are triggers bad practice?

Triggers are evil. And it’s not just utl_mail; the same thing would happen with utl_file, utl_http, and many other utl_ functions. And it is a popular practice to write audit records using autonomous transactions fired from within triggers.

What are nested triggers?

Both DML and DDL triggers are nested when a trigger performs an action that initiates another trigger. These actions can initiate other triggers, and so on. DML and DDL triggers can be nested up to 32 levels. You can control whether AFTER triggers can be nested through the nested triggers server configuration option.

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 Cannot have a trigger associated with it MySQL?

MySQL trigger limitations MySQL triggers cannot: Use SHOW , LOAD DATA , LOAD TABLE , BACKUP DATABASE, RESTORE , FLUSH and RETURN statements. Use statements that commit or rollback implicitly or explicitly such as COMMIT , ROLLBACK , START TRANSACTION , LOCK/UNLOCK TABLES , ALTER , CREATE , DROP , RENAME.

Can we call trigger inside trigger?

In addition to being triggered by DML and DDL operations, triggers in SQL Server can also be triggered by other triggers. This type trigger is called a nested trigger in SQL or a recursive trigger. In this article we will see how nested triggers in SQL Server work.