key msqid owner perms used-bytes messages

[root@felix kernel]

通过以上输出看到为了创建Oracle的SGA，系 统 共 分 配 了3个共享内存段。接下来针对一个后台进程，使用pmap工具查看一下每个共享内存段的地址空间：

[root@felix kernel]# ps -ef | grep dbw

oracle 2493 1 0 10:22 ? 00:00:00 ora_dbw0_felix

root 2688 2201 0 10:31 pts/0 00:00:00 grep dbw

[root@felix kernel]#?

[root@felix kernel]# pmap 2493

2493: ora_dbw0_felix

0000000000400000 183412K r-x-- /u01/app/oracle/product/11.2.0/db_1/bin/oracle

000000000b91d000 1884K rwx-- /u01/app/oracle/product/11.2.0/db_1/bin/oracle

000000000baf4000 304K rwx-- [ anon ]

000000000d796000 444K rwx-- [ anon ]

0000000060000000 4K r-xs- /dev/shm/ora_felix_229382_0

0000000060001000 4092K rwxs- /dev/shm/ora_felix_229382_0

0000000060400000 4096K rwxs- /dev/shm/ora_felix_229382_1

0000000060800000 4096K rwxs- /dev/shm/ora_felix_262151_0

0000000060c00000 4096K rwxs- /dev/shm/ora_felix_262151_1

0000000061000000 4096K rwxs- /dev/shm/ora_felix_262151_2

0000000061400000 4096K rwxs- /dev/shm/ora_felix_262151_3

0000000061800000 4096K rwxs- /dev/shm/ora_felix_262151_4

0000000061c00000 4096K rwxs- /dev/shm/ora_felix_262151_5

0000000062000000 4096K rwxs- /dev/shm/ora_felix_262151_6

0000000062400000 4096K rwxs- /dev/shm/ora_felix_262151_7

0000000062800000 4096K rwxs- /dev/shm/ora_felix_262151_8

0000000062c00000 4096K rwxs- /dev/shm/ora_felix_262151_9

0000000077400000 4096K rwxs- /dev/shm/ora_felix_262151_91

0000000077800000 4096K rwxs- /dev/shm/ora_felix_262151_92

0000000077c00000 4096K rwxs- /dev/shm/ora_felix_262151_93

0000000078000000 4096K rwxs- /dev/shm/ora_felix_262151_94

0000000078400000 4096K rwxs- /dev/shm/ora_felix_262151_95

0000000078800000 4096K rwxs- /dev/shm/ora_felix_262151_96

0000000078c00000 4096K rwxs- /dev/shm/ora_felix_262151_97

0000000079000000 4096K rwxs- /dev/shm/ora_felix_294920_0

注意：这里的229382、262151等就是ipcs里所看到的共享内存ID（shmid）。

00000030a0800000 128K r-x-- /lib64/ld-2.12.so

00000030a0a21000 4K rwx-- [ anon ]

00000030a0c00000 4K r-x-- /lib64/libaio.so.1.0.1

00000030a138c000 4K rwx-- /lib64/libc-2.12.so

00000030a138d000 20K rwx-- [ anon ]

00000030a1400000 524K r-x-- /lib64/libm-2.12.so

00000030a1a18000 4K rwx-- /lib64/libpthread-2.12.so

00000030a1a19000 16K rwx-- [ anon ]

00000030a2207000 4K rwx-- /lib64/librt-2.12.so

00000030b1800000 32K r-x-- /usr/lib64/libnuma.so.1

00000030b2000000 88K r-x-- /lib64/libnsl-2.12.so

00000030b2016000 2044K ----- /lib64/libnsl-2.12.so

00000030b2215000 4K r-x-- /lib64/libnsl-2.12.so

00000030b2216000 4K rwx-- /lib64/libnsl-2.12.so

00000030b2217000 8K rwx-- [ anon ]

00007f7f3c5d0000 64K rwx-- /dev/zero

00007f7f3c5e0000 64K rwx-- /dev/zero

00007f7f3c5f0000 144K rwx-- /dev/zero

00007f7f3c614000 7588K rwx-- [ anon ]

00007f7f3cf8a000 4K rwx-- /lib64/libnss_files-2.12.so

00007f7f3cfab000 4K rwxs- /u01/app/oracle/product/11.2.0/db_1/dbs/hc_felix.dat

00007f7f3cfac000 1296K rwx-- [ anon ]

00007f7f3d0f0000 8K r-x-- /lib64/libdl-2.12.so

00007f7f3d0f2000 2048K ----- /lib64/libdl-2.12.so

00007f7f3d2f2000 4K r-x-- /lib64/libdl-2.12.so

00007f7f3d2f3000 4K rwx-- /lib64/libdl-2.12.so

00007f7f3d2f4000 4K rwx-- [ anon ]

00007f7f3d2f5000 44K r-x-- /u01/app/oracle/product/11.2.0/db_1/lib/libocrutl11.so