RE: clone creations fails with shared memory realm already exists
Date: Thu, 7 Feb 2019 19:23:31 +0000
Message-ID: <87791_1549567435_5C5C85CB_87791_6096_1_35d6d21a4b904ca69cfbc48cacbcdf25_at_vontobel.com>
Jeff,
Could you post ipcs –am output from before executing the ipcrm commands and the ipcrm commands themselves, so that we try to figure what went wrong?
Nenad
https://nenadnoveljic.com/blog/
From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of Noveljic Nenad
Sent: Donnerstag, 7. Februar 2019 19:41
To: Jeff Chirco <backseatdba_at_gmail.com>
Cc: Mark W. Farnham <mwf_at_rsiz.com>; oracle-l-freelist <oracle-l_at_freelists.org>
Subject: RE: clone creations fails with shared memory realm already exists
That’s strange. I can’t see why removing a non-used shared memory segment would crash any database.
Meanwhile, Stefan has already suggested a better way for identifying shared memory segments belonging to a particular database.
sysresv
The dead segments can be removed by ipcrm –m shmid
Expectedly, the segments listed by sysresv match the ipcs –am output, which also shows some additional information, such as the number of attached processes, last access time etc.:
ipcs -am | grep 905970
So for safety reasons, both outputs can be compared before removing any segments.
Nenad
https://nenadnoveljic.com/blog/
From: Jeff Chirco <backseatdba_at_gmail.com<mailto:backseatdba_at_gmail.com>>
Sent: Donnerstag, 7. Februar 2019 18:21
To: Noveljic Nenad <nenad.noveljic_at_vontobel.com<mailto:nenad.noveljic_at_vontobel.com>>
Cc: Mark W. Farnham <mwf_at_rsiz.com<mailto:mwf_at_rsiz.com>>; oracle-l-freelist <oracle-l_at_freelists.org<mailto:oracle-l_at_freelists.org>>
Subject: Re: clone creations fails with shared memory realm already exists
Ok that apparently crashed a few of my dev databases that were running when I did that. I got reports of errors and when I tried to log in to database it said shared memory realm already exists. I ran a ps -ef | grep for the database name and found a bunch of processes still running. Killed the pmon and they all dropped and I was able to restart the database. No harm done as it is just Dev but I don't think anyone will want to do this on a Production system with other running databases, maybe if they are all down.
Shared Memory:
ID KEY
905970099 0x00000000
905970100 0x00000000
905970101 0x00000000
905970098 0x00000000
905970102 0x6073fcb8
m 905970102 0x6073fcb8 --rw------- oracle dba oracle dba 64 20480 23319 28463 19:23:10 19:23:10 10:04:51
m 905970101 0x0 --rw------- oracle dba oracle dba 64 92274688 23319 28463 19:23:10 19:22:56 10:04:51
m 905970100 0x0 --rw------- oracle dba oracle dba 64 973078528 23319 28463 19:23:10 19:22:56 10:04:51
m 905970099 0x0 --rw------- oracle dba oracle dba 64 3221225472 23319 28463 19:23:10 19:22:56 10:04:51
m 905970098 0x0 --rw------- oracle dba oracle dba 64 10485760 23319 28463 19:23:10 19:22:56 10:04:51
On Thu, Feb 7, 2019 at 8:56 AM Jeff Chirco <backseatdba_at_gmail.com<mailto:backseatdba_at_gmail.com>> wrote: Thanks Mark and Nenad, removing the dead segments worked. Learned something today!
Jeff
On Thu, Feb 7, 2019 at 7:38 AM Noveljic Nenad <nenad.noveljic_at_vontobel.com<mailto:nenad.noveljic_at_vontobel.com>> wrote: You’d need to look for a segment with no attached processes (NATTACH=0). It’s a dead segment that can be removed with ipcrm.
IPC status from <running system> as of Thu Feb 7 16:34:40 MET 2019 T ID KEY MODE OWNER GROUP CREATOR CGROUP NATTCH SEGSZ CPID LPID ATIME DTIME CTIME Shared Memory:
m 1560281188 0x2a54d290 --rw------- oracle dba oracle dba 453 28672 8707 24484 16:34:33 16:34:33 8:47:09 m 905969763 0x0 --rw------- oracle dba oracle dba 453 329252864 8707 24484 16:34:33 16:34:33 8:47:09…
Best regards,
Nenad
https://nenadnoveljic.com/blog/
From: oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org> <oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org>> On Behalf Of Jeff Chirco Sent: Donnerstag, 7. Februar 2019 16:33 To: Mark W. Farnham <mwf_at_rsiz.com<mailto:mwf_at_rsiz.com>> Cc: oracle-l-freelist <oracle-l_at_freelists.org<mailto:oracle-l_at_freelists.org>> Subject: Re: clone creations fails with shared memory realm already exists
Hi Mark not sure what to look for with that. There is 22 other databases running on this server. Its a dev server with a bunch of clones and little use.
On Wed, Feb 6, 2019 at 7:41 PM Mark W. Farnham <mwf_at_rsiz.com<mailto:mwf_at_rsiz.com>> wrote: see what ipcs –m says is allocated.
From: oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org> [mailto:oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org>] On Behalf Of Jeff Chirco
Sent: Wednesday, February 06, 2019 10:05 PM
To: oracle-l-freelist
Subject: clone creations fails with shared memory realm already exists
Ok I am confused. I am trying to make a thin clone of our database from one server to another. Something I have done many times. I use NetApp Snap Manager for Oracle. Oracle EE 12.2.0.1 running on Oracle Linux 7. The clone process is failing with ORA-27100: shared memory realm already exists.
This database does not currently exist. I ran a ps -ef | grep for my database name and no process are found. There is nothing in /etc/oratab. I've tried adding an entry to make sure a database with that name is not running. There is no pfile, spfile, password file. I've checked /dev/shm for any files related to my database name and there is nothing. I don't understand by it thinks shared memory realm already exists. Any suggestions?
Thanks,
Jeff
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