RE: oracle handing memory allocation different between 11g and 12c?

  • From: Stefan Koehler <contact@xxxxxxxx>
  • To: MAdams@xxxxxxxxxxxxxxxxxxx
  • Date: Tue, 16 Feb 2016 18:07:22 +0100 (CET)

Hi Matt,
not quite sure what's wrong in your env. OSM and 12.1.0.2 works like a charm 
here :)

root@SOL:~# pmap -xs 1827 
1827:   ora_smon_S12DB
         Address     Kbytes        RSS       Anon     Locked Pgsz Mode   Mapped 
File

0000000060000000       4096       4096          -       4096   2M rwxs-    [ 
osm shmid=0x5000009 ]
0000000080000000      98304      98304          -      98304    - r-xs-    [ 
osm shmid=0x500000a ]
00000000C0000000    3981312    3981312          -    3981312   2M rwxs-    [ 
osm shmid=0x500000b ]
00000001C0000000      14336      14336          -      14336   2M rwxs-    [ 
osm shmid=0x500000c ]


Please DTrace the corresponding syscalls to get a better insight in your case.

root@SOL:~# dtrace -l 
   ID   PROVIDER            MODULE                          FUNCTION NAME

  256    syscall                                             memcntl entry
  257    syscall                                             memcntl return
20833        fbt           genunix                           memcntl entry
20834        fbt           genunix                           memcntl return
78362        fbt            shmsys                        shmget_osm entry
78363        fbt            shmsys                        shmget_osm return
78364        fbt            shmsys                            shmget entry
78365        fbt            shmsys                            shmget return


Best Regards
Stefan Koehler

Freelance Oracle performance consultant and researcher
Homepage: http://www.soocs.de
Twitter: @OracleSK

Matt Adams <MAdams@xxxxxxxxxxxxxxxxxxx> hat am 16. Februar 2016 um 16:28 
geschrieben:

 But in 12c, Oracle prefers using OSM over either ISM or DISM.   That appears 
to be the cause the of the problems I’m having.

 Anybody else install 12c on solaris and have issues with OSM not working as 
expected?

 Matt
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