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Oracle v$session Tips


Oracle Tips by Burleson Consulting

Question: How to I use v$session to find the server user ID and other information from the dictionary?  Is there more than v$session?

Answer: Here is a good script to display all Oracle session details including the osuser and server name.  The script joins v$session and v$process to get the PID.  The PID can be joined into other views (v$sql_plan) to get more details for each Oracle user session. 

Also see how to query SQL details (rows processed) for a specific user session.

If you don't want to write your own v$ scripts, you can download over 600 dictionary scripts in the Oracle scripts collection.

Viewing complete session information

Most Oracle professionals know that they can query the v$session view to see the current sessions. However, instead of v$session you can also interrogate the v$sysstat view to see the current logons, cumulative logons since startup, and the high-water-mark of logons since startup time.

The following v$session script provides a wealth of information about the number of sessions on your Oracle database.

rem session.sql - displays all connected sessions
set echo off;
set termout on;
set linesize 80;
set pagesize 60;
set newpage 0;
 
select
rpad(c.name||':',11)||rpad(' current logons='||
(to_number(b.sessions_current)),20)||'cumulative logons='||
rpad(substr(a.value,1,10),10)||'highwater mark='||
b.sessions_highwater Information
from
v$sysstat a,
v$license b,
v$database c
where
a.name = 'logons cumulative'
;
 
ttitle "dbname Database|UNIX/Oracle Sessions";
 
set heading off;
select 'Sessions on database '||substr(name,1,8) from v$database;
set heading on;
select
substr(a.spid,1,9) pid,
substr(b.sid,1,5) sid,
substr(b.serial#,1,5) ser#,
substr(b.machine,1,6) box,
substr(b.username,1,10) username,
-- b.server,
substr(b.osuser,1,8) os_user,
substr(b.program,1,30) program
from v$session b, v$process a
where
see code depot for full script
b.paddr = a.addr
and type='USER'
order by spid;
ttitle off;
set heading off;
select 'To kill, enter SQLPLUS> ALTER SYSTEM KILL SESSION',
''''||'SID, SER#'||''''||';' from dual;
spool off;

 


 

 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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