n ° of series and SID

Hello!!!

I am a student of WDP funa-1 9i DBA. I need help:

(If I'm not mistaken) v$ session is seen dynamic that store information about oracle.but my question is why no_serie and SID is needed to kill the session? Why not only SID to kill the session?

Another thing is that a user can use several session(as_oracle_does_not_restrict_to_do_so).we observed there is a unique - ment for Serial # so why do we need to mention the SID to kill the session?
And my last question is, how the SID and the serial no is generated?

Hello

my example comes from a RAC system where there are two instances of 'collaborators' on the same database, so that you can easily see two sessions with the same sid in sid

' is reassigned permanently, and so if a session ends, next session connection could have the same sid assigned, while the serial no is a sort of counter ", which is

incremented each time that a sid reused by anotehr session id"(from Oracle9i Database Performance Tuning Guide and reference), it's like a 'measure' of how

Once a sid is reused. In addition v$ session.audsid, too, can be used to identify a session

SQL> select sid, serial# from v$session where program like '%Pl%';

       SID    SERIAL#
---------- ----------
       139      37758
       142      41671

SQL> select sid, serial# from v$session where program like '%Pl%';

select sid, serial# from v$session where program like '%Pl%'

Not logged on                                 <---------- Here I Logged off

SQL> select sid, serial# from v$session where program like '%Pl%';

       SID    SERIAL#
---------- ----------
       139      37768
       142      41683                          <----------- System regave me same sid, but SERIAL# incremented

I can only imagine that the couple sid, serial # gives you more 'precision' to get the good session, and of course it is not in absolute terms, the only method for

identify a session, but it is the implemented method oracle developers. They're just assuring us that we kill not bad sessions!

Good bye

Tags: Database

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