Question: Does Trigger Need Commit?

Can we use commit in procedure?

In general, procedures should not commit.

If you commit inside of a stored procedure, you are limiting its reusability because a caller that wants the changes the procedure makes to be part of a larger transaction cannot simply call the procedure directly..

Can we write commit in trigger?

Trigger should not commit and cannot commit. Committing in a trigger usually raises an exception unless it happens into autonomous transaction. When you open connection, Oracle creates session for it.

What is DML DDL DCL in SQL?

These SQL commands are mainly categorized into four categories as: DDL – Data Definition Language. DQl – Data Query Language. DML – Data Manipulation Language. DCL – Data Control Language.

What is difference between raise and raise application?

RAISE_APPLICATION_ERROR is a standard built-in procedure by Oracle that raises an error with number and user understandable error message. … Raise_application_error shows application specific error message. You cannot re-raise it.

What is mutating in the trigger?

A mutating table error (ORA-04091) occurs when a row-level trigger tries to examine or change a table that is already undergoing change (via an INSERT, UPDATE, or DELETE statement). In particular, this error occurs when a row-level trigger attempts to read or write the table from which the trigger was fired.

Can we write exception in trigger?

1 Answer. You’re almost there; you need a DECLARE block in a trigger if you want to declare anything; this means that your WHEN clause is in the wrong place. A few points: Never catch an exception and then call DBMS_OUTPUT.

Can we use autonomous transaction in triggers?

Once started, an autonomous transaction is fully independent. … Unlike regular triggers, autonomous triggers can contain transaction control statements such as COMMIT and ROLLBACK , and can issue DDL statements (such as CREATE and DROP ) through the EXECUTE IMMEDIATE statement.

Can we use TCL commands in trigger?

Generally In triggers you can’t use TCL commands. But you can use TCL commands in Autonomous Triggers. You can declare a trigger as Autonomous by providing PRAGMA AUTONOMOUS_TRANSACTION in the beginning of the trigger. … You can use these type of triggers to maintain log details of a table.

What is raise application error?

Answer: The raise_application_error is actually a procedure defined by Oracle that allows the developer to raise an exception and associate an error number and message with the procedure. … Oracle provides the raise_application_error procedure to allow you to raise custom error numbers within your applications.

What is autonomous transaction?

Autonomous Transactions. Autonomous transactions allow you to create a new transaction within a transaction that may commit. or roll back changes, independently of its parent transaction.

When we use Pragma autonomous transaction?

The AUTONOMOUS_TRANSACTION pragma changes the way a subprogram works within a transaction. A subprogram marked with this pragma can do SQL operations and commit or roll back those operations, without committing or rolling back the data in the main transaction.

Which is DDL command?

Data Definition Language (DDL) commands are used to create, manipulate, and modify objects in Snowflake, such as users, virtual warehouses, databases, schemas, tables, views, columns, functions, and stored procedures.

What is the difference between Pragma Exception_init and Raise_application_error?

pragma exception init turns an Oracle Error into a named exception. If a database operation raises an ORA-00054 “resource busy”, you would have to code: …. … Raise_application_error is used to RAISE an error – exception_init is used to deal with errors (i guess you could say they are opposites in a way).