Re: get sid (session id) and serial#?

It's hardly illogical. The purpose of this view is not to provide the SID of the current session, but to show statistics, some of which the DBA may not want a user to know in all cases. Therefore the view is granted to a role SELECT_CATALOG_ROLE, similar to most other dictionary views. Any user with that role can see the view.

However, granting the role SELECT_CATALOG_ROLE to all users is not advisable at all. If a user needs it, a very simple "grant select on v_$mystat to <username>" can be issued which will resolve the problem. At a development site, or a site where the security for this view is not quite pronounced, you can issue the follwing which will make everyone see this view.

grant select on v_$mystat to public;

This will make the view visible to even the users created after this command. The decision to hide this view from normal users is deliberate; but breaking that lock is not hard either using a simple grant as shown.

Going back to the discussion on why it has been so hard for a user to know his/her SID - why does a user need to know the SID? To alter the DBA for some monitoring action and seeing the SID will help the DBA see that in V$SESSION? In that case, the proper technique is to set the client identifier using DBMS_APPLICATION_INFOR.SET_IDENTIFIER procedure. The value shows up in v$session, no need to know the SID.

What else? In a web app maintain state between pages using SID? this approach is fraight with errors. First, SID is not guaranteed to be unique; SID and SERIAL# combination is. To guarantee a unique identifier, use the function DBMS_SESSION.UNIQUE_SESSION_ID to get an id that is unique in a session and use it to maintain state.

If it is necessary that the user must know the SID, then the V$MYSTAT can be queried.

Hope this helps.

Arup Nanda

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Monday, September 01, 2003 4:54 AM

> It does seem illogical than Oracle provide a view called mystat which
tells you about your own statistics, including SID and yet a normal user does not have access to that view unless specifically given.
>
> John
>
> -----Original Message-----
> Sent: 30 August 2003 15:04
> To: Multiple recipients of list ORACLE-L
>
>
> > But the user need select access to v$mystat
>
> connect as sysdba and grant select on v_$mystat to <user>;
>
> HTH
> GovindanK
>
> > Thanks all for the input.
> >
> > the script is select sid,serial# from v$session where sid=(select sid
from
> > v$mystat where rownum=1)
> >
> > But the user need select access to v$mystat
> >
> > Chuan
> >
> > -----Original Message-----
> > Sent: Friday, 29 August 2003 15:19
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > Hi Chuan,
> >
> > can v$session help you
> >
> > this view has information like machine, osuser, username, sid, program,
> > and
> > others
> >
> > SQL> desc v$session
> >
> > SQL> select columns,... from v$session where username = 'SCOTT' and
> > machine
> > = 'YOUR_HOSTNAME'
> >
> > if you do telnet you will get 2 rows (if scoot is only use by you)
> >
> > is not
> >
> > Sinardy
> >
> > -----Original Message-----
> > Sent: 29 August 2003 12:34
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > DABs,
> >
> > Is there any way in my connection to get the sid and serial# for my
own
> > connection?
> >
> > Suppose I connect to Oracle db by >sqlplus scott/tiger_at_test.
> > In this connection,
> >
> > SQL>
> >
> > What shoud I input to get this sid and serial#?
> >
> > TIA
> >
> > Chuan
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Arup Nanda
  INET: orarup_at_hotmail.com

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