- Is commit needed after insert?
- Can trigger change the table from which it has been called?
- Is it good to use limit keyword with bulk collect?
- How many types of Pragma are there in Oracle?
- What is Pragma in SQL?
- When a commit is issued what will happen?
- What is Pragma Autonomous_transaction in trigger?
- Can use Pragma Autonomous_transaction in packages?
- Can we use commit in trigger Oracle?
- Can we use TCL commands in trigger?
- What is mutating in the trigger?
- What is the Pragma Exception_init used for?
Is commit needed after insert?
So yes, by default, if you’re just using INSERT , the records you insert will be committed, and there is no point trying to roll them back.
(This is effectively the same as wrapping each statement between BEGIN and COMMIT .).
Can trigger change the table from which it has been called?
A trigger cannot change the table from which it has been called. If there is a trigger called as a result of insert on a table, then the trigger cannot insert/update the same table.
Is it good to use limit keyword with bulk collect?
As the number of rows in the table grows, more memory will be consumed. So the general recommendation for production code, working with tables that may grow greatly in size, is to avoid SELECT BULK COLLECT INTO (an implicit query) and instead use the FETCH BULK COLLECT with a LIMIT clause.
How many types of Pragma are there in Oracle?
5 typesThe 5 types of Pragma directives available in Oracle are listed below: PRAGMA AUTONOMOUS_TRANSACTION: This pragma can perform an autonomous transaction within a PL/SQL block between a BEGIN and END statement without affecting the entire transaction.
What is Pragma in SQL?
The PRAGMA keyword is used to signify that the remainder of the PL/SQL statement is a pragma, or directive, to the compiler. Also called apseudoinstruction, a pragma simply passes information to the compiler rather than getting transformed into a particular execution.
When a commit is issued what will happen?
The general format is to issue a BEGIN WORK statement, one or more SQL statements, and then the COMMIT statement. A COMMIT statement will also release any existing savepoints that may be in use. This means that once a COMMIT statement is issued, you can not rollback the transaction.
What is Pragma Autonomous_transaction in trigger?
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.
Can use Pragma Autonomous_transaction in packages?
You cannot apply this pragma to an entire package or an entire an object type. Instead, you can apply the pragma to each packaged subprogram or object method. You can code the pragma anywhere in the declarative section.
Can we use commit in trigger Oracle?
You can’t commit inside a trigger anyway. Trigger should not commit and cannot commit. Committing in a trigger usually raises an exception unless it happens into autonomous transaction.
Can we use TCL commands in trigger?
Generally In triggers you can’t use TCL commands. … You can declare a trigger as Autonomous by providing PRAGMA AUTONOMOUS_TRANSACTION in the beginning of the trigger. At a same time you have to end your trigger with commit/rollback. You can use these type of triggers to maintain log details of a table.
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.
What is the Pragma Exception_init used for?
The pragma EXCEPTION_INIT associates an exception name with an Oracle error number. You can intercept any ORA- error and write a specific handler for it instead of using the OTHERS handler.