Oracle 11g /proc file system files on Linux x86-64

Question

OS: RHEL 5.6
Oracle: 11.2.0.3 Standard Edition RAC (GI and DB)
In 11.2.0.3, it is found that the pseudo files for Oracle processes in /proc filesystem were owned by root, even though the process owner is oracle.
[oracle@dbserver proc]$ ps -ef|grep ckpt
oracle    7358     1  0 Dec17 ?        00:00:46 ora_ckpt_orcl1
oracle   28190 27544  0 12:08 pts/1    00:00:00 grep ckpt
[oracle@dbserver proc]$ cd /proc/7358
[oracle@dbserver 7358]$ ls -l
ls: cannot read symbolic link cwd: Permission denied
ls: cannot read symbolic link root: Permission denied
ls: cannot read symbolic link exe: Permission denied
total 0
dr-xr-xr-x 2 oracle asmdba 0 Dec 19 12:08 attr
-r-------- 1 root   root   0 Dec 19 12:08 auxv
-r--r--r-- 1 root   root   0 Dec 19 10:58 cmdline
-rw-r--r-- 1 root   root   0 Dec 19 12:08 coredump_filter
-r--r--r-- 1 root   root   0 Dec 19 12:08 cpuset
lrwxrwxrwx 1 root   root   0 Dec 19 12:08 cwd
-r-------- 1 root   root   0 Dec 19 12:08 environ
lrwxrwxrwx 1 root   root   0 Dec 19 12:08 exe
dr-x------ 2 root   root   0 Dec 17 22:17 fd
dr-x------ 2 root   root   0 Dec 19 12:08 fdinfo
-r--r--r-- 1 root   root   0 Dec 19 12:08 io
-r--r--r-- 1 root   root   0 Dec 19 10:58 limits
-rw-r--r-- 1 root   root   0 Dec 19 12:08 loginuid
-r--r--r-- 1 root   root   0 Dec 19 12:08 maps
-rw------- 1 root   root   0 Dec 19 12:08 mem
-r--r--r-- 1 root   root   0 Dec 19 12:08 mounts
-r-------- 1 root   root   0 Dec 19 12:08 mountstats
-r--r--r-- 1 root   root   0 Dec 19 12:08 numa_maps
-rw-r--r-- 1 root   root   0 Dec 19 12:08 oom_adj
-r--r--r-- 1 root   root   0 Dec 19 12:08 oom_score
lrwxrwxrwx 1 root   root   0 Dec 19 12:08 root
-r--r--r-- 1 root   root   0 Dec 19 12:08 schedstat
-r--r--r-- 1 root   root   0 Dec 19 12:08 smaps
-r--r--r-- 1 root   root   0 Dec 19 10:59 stat
-r--r--r-- 1 root   root   0 Dec 19 10:58 statm
-r--r--r-- 1 root   root   0 Dec 19 10:58 status
dr-xr-xr-x 3 oracle asmdba 0 Dec 19 12:08 task
-r--r--r-- 1 root   root   0 Dec 19 11:00 wchanAs a result, many diagnostic utility, like the /proc filesystem (especially the fd/ subdirectory), lsof, strace, gdb, ... were not usable by the the oracle OS account. Any idea?
In 10g + RHEL 5.2, the psuedo files were owned by oracle.

Answer 1

sb92075 wrote:
different system, different OS, & different permissions which has NOTHING to do with Oracle RDBMSDon't agree. Permissions, ownership, etc could be reconfigured while process spawn, this is surely related to Oracle Software. (Well, you may argue that it is related to GI only. But the situation is the same for standalone DB running on standalone ASM).