SID's PID's and SPID's

Match a sid to a pid or a spid
The following query will help us match a Oracle session ID to a server process ID. You can either use the Oracle SID to find the server process or visa versa.

select s.sid, s.serial#, p.pid orapid, p.spid srvpid, p.pname, p.username from v$session s, v$process p where p.addr = s.paddr and s.sid = ### -- oracle sid --and p.spid = #### -- server pid

If using Oracle apps, If the session belongs to apps user, we can find out the PID for the SID.

select pid, sid from v$process, v$session where v$process.addr = v$session.paddr and sid = ###;

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keyword sid pid lock spid
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