Table error with FUSION, but not with INSERT changing

I get an error of trigger of table mutation in a MERGE statement, but not for INCLUSION. I know a trigger should not be used like that, but it has been in the system for centuries. I just want to understand why this is happening for the MERGER, but not the INSERT. Maybe that's "just how Oracle works.

Here is a very simple example on the 11.2.0.2.0 database.

Thank you

INO

create table mutate (identification number, name varchar2 (10));

create or replace trigger mutate_biur

before inserting transfer him

for each line

Start

for r in (select 1

to mutate

WHERE name =: new.name

)

loop

raise_application_error (-20000, 'name already exists');

end loop;

end;

insert into mutate values (1, 'Name1');

Fusion in mute m

using (select 2 id, 'Name2' double name) t

on (m.id = t.id)

when matched, then update set $m.name = t.nom

When not matched then insert (m.id, $m.name) (t.id, t.name) values;

Output for this is:

Table created.


Trigger created.


1 line of creation.  -No error here


Fusion in mute m

using (select 2 id, 'Name2' double name) t

on (m.id = t.id)

when matched, then update set $m.name = t.nom

When not matched then insert (m.id, $m.name) (t.id, t.name) values

Error on line 20

ORA-04091: table PROD. MUTATE is changing, the function of triggering/can not see

ORA-06512: at the 'PROD '. MUTATE_BIUR', line 2

ORA-04088: error during execution of trigger ' PROD. MUTATE_BIUR'

INSERT INTO table VALUES (.) is a special case - it knows it will insert only one line, and the Before Insert trigger knows that it takes only for the first line, if you see a stable table.

Insert to mutate select id 2, 'Name2' name of the double

give the ORA-04091: table MUTATE is changing, function of triggering/can not see

So the difference is not simply INSERT vs FUSION, INSERT... The value of VALUES versus INSERT or MERGE a query result.

Tags: Database

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