sql_id is not in v$session

Hi,

On 11.2.0.4 on AIX

A query that I know its sql_id is executed by user system every 5 minutes on database.

But any time I qury v$session:

select * from v$session where sql_id = 'aesrzt';

I have :

no rows selected

In an AWR for two hours I see it executed 25 times:

Any explanation?

Thank you.