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Regardless of OS, it seems that one PMON process was leftover from a prior startup of the database instance. What did the UNIX "ps -ef" command show for the start-time for each of the processes --- I'll bet they were different. Even if they weren't different, if the starts were prior to yesterday, then "ps" will show only the date not the time, so they could have been from different startups within the same day.
-- http://www.freelists.org/webpage/oracle-l Received on Wed Sep 26 2007 - 13:56:03 CDTWas it on AIX? We have seen similar strange things there. I don't remember all the details, but at one point there were no background processes, yet we could still logon using sqlplus! Couldn't do anything, but it said we were connected. When we tried to startup the database, it also told us that it was already running. KeithOk, I just ran into a strange one this morning. US central time that is. We are moving our clustered databases to new servers, and we put one database onto the new hardware for initial testing. We restored from a backup, and got both instances running. Today when I did a ps -ef | grep pmon I saw two pmon processes going for the single instance. I have no idea what could have caused that. So I set my oracle_sid, path, oracle_Home and shutdown the instance. What do you know, there was still one pmon process running. I did a kill -9 on that one. Then I go to start the instance again. And I get this error: ORA 01081 "cannot start already-running ORACLE - shut it down first" I did a ps -ef | grep oracle, didnt get anything (except my user process of course). I finally googled and found one possibility, a locked shared memory segment. Sure enough ipcs -a | grep dba returned a large segment of memory that was still locked. So I ran this (found on the same site) and released it: ipcs -a | grep dba | perl -ane 'system "ipcrm -$F[0] $F[1]"' My question is, has anyone seen this before, or know what causes it? -- Andrew W. Kerber 'If at first you dont succeed, dont take up skydiving.'-- http://www.freelists.org/webpage/oracle-l