Why need serial for single sign-on info

Hello everyone,

as you know, a session is unique with 2 fields, SID and serial that exists on the view v$ session.

My question is why no serial need and for which case no_serie evolves.

now, you can say that, "only oracle developers know this, it is the design," but I want to say is, for ex: if I wanted to find a session that is locked by another session, I use this:
select * from v$session where blocking_session is not null;
in the blocking_Session field, oracle gives me the session id (SID) that is blocking a session. so I can use this SID and I can kill for example but SID is not unique for a session I can find more than one session with the same SID that it is blocking?

in real life I saw an example of this, there is not even sid to the system as my example of session blocking. so I believe that this # is the attribution to another series end, I mean, I thougth it might be for the autonomous transaction, maybe they user same sid but DIF serial # but when I tested it, I saw that I was wrong.

so, why no_serie is exist. If there is a design problem, how can I find a session blocking by simply using SID information?

Thank you very much.

The SERIAL no is mainly used to ensure that the session level controls are applied to the correct session objects if the session ends and a new session begins with the same session ID.

Tags: Database

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