Hello,
I have a server running Oracle 10g on a RHEL 5.3. I need to determine how
much memory Oracle is using but I ran into some problems while trying to do
that with the shared memory segments.
[root@abcserver ~]# free -m
total used free shared buffers cached
Mem: 8988 8906 82 0 102 5411
-/+ buffers/cache: 3392 5596
Swap: 3999 1577 2422
[root@abcserver ~]# ipcs -m
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x0a008088 0 root 666 4096 2
0x1400808a 32769 root 666 4 0
0x0400808a 65538 root 600 4096 0
0x0a159d08 98307 oracle 640 132120576 19
0x1f361e94 131076 oracle 660 1612709888 57
0x781df938 163845 oracle 660 4297064448 51
0xefdb0bf8 229382 oracle 660 1033895936 283
If I add up the sizes of the shared segments for the oracle processes I get
that they are using aroung 6.6 Gb of memory alone... and that is not
including non-shared memory segments. My biggest issue is that from the free
command I get that the system is using around 5Gb (Mem used - Mem cached +
swap used). What am I doing wrong in here?
What would be the best way to estimate how much memory a given user is using
if we know that the processes on the system do have heavy shared memory
segments?
Thanks in advance.
Alba
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