随着数据库新版本的推广ASM肯定会越来越被重视,最近准备系统的学习下ASM,以备突发情况需要,这是asm深入学习第一篇,参考:dd复制ASM中的datafile
查询ASM某个数据文件AU信息
SQL> SELECT GROUP_NUMBER, FILE_NUMBER, NAME
2 FROM v$asm_alias
3 WHERE NAME LIKE '%USER%'
4 GROUP BY GROUP_NUMBER, FILE_NUMBER, NAME;
GROUP_NUMBER FILE_NUMBER NAME
------------ ----------- -----------------------------
2 259 USERS.259.776961317
SQL> SELECT disk_kffxp, au_kffxp, xnum_kffxp
2 FROM x$kffxp
3 WHERE GROUP_KFFXP=2
4 AND NUMBER_KFFXP=259;
DISK_KFFXP AU_KFFXP XNUM_KFFXP
---------- ---------- ----------
1 817 0
0 507 1
1 818 2
0 508 3
1 819 4
1 820 5
SQL> select DISK_NUMBER,GROUP_NUMBER,PATH from v$asm_disk
2 where GROUP_NUMBER=2 and DISK_NUMBER in(1,0);
DISK_NUMBER GROUP_NUMBER PATH
----------- ------------ -----------------------------------
1 2 /dev/oracleasm/disks/VOL4
0 2 /dev/oracleasm/disks/VOL3
查询ASM DISK对应的磁盘或者分区
[grid@rac1 ~]$ /etc/init.d/oracleasm querydisk -d VOL3
Disk "VOL3" is a valid ASM disk on device [8,17]
[grid@rac1 ~]$ /etc/init.d/oracleasm querydisk -d VOL4
Disk "VOL4" is a valid ASM disk on device [8,18]
[grid@rac1 ~]$ cat /proc/partitions |grep "8 17"
8 17 2409718 sdb1
[grid@rac1 ~]$ cat /proc/partitions |grep "8 18"
8 18 3879697 sdb2
更多精彩内容：http://www.bianceng.cn/database/Oracle/
dd操作磁盘或者分区
[root@rac1 ~]# dd if=/dev/sdb2 bs=1024k count=1 skip=817 of=/tmp/user_1.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.188362 seconds, 5.6 MB/s
[root@rac1 ~]# dd if=/dev/sdb1 bs=1024k count=1 skip=507 of=/tmp/user_2.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.259001 seconds, 4.0 MB/s
[root@rac1 ~]# dd if=/dev/sdb2 bs=1024k count=1 skip=818 of=/tmp/user_3.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.182559 seconds, 5.7 MB/s
[root@rac1 ~]# dd if=/dev/sdb1 bs=1024k count=1 skip=508 of=/tmp/user_4.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.10011 seconds, 10.5 MB/s
[root@rac1 ~]# dd if=/dev/sdb2 bs=1024k count=2 skip=819 of=/tmp/user_5.dbf
2+0 records in
2+0 records out
2097152 bytes (2.1 MB) copied, 0.22389 seconds, 9.4 MB/s
[root@rac1 ~]# ll /tmp/user_*
-rw-r--r-- 1 root root 1048576 Apr 29 18:50 /tmp/user_1.dbf
-rw-r--r-- 1 root root 1048576 Apr 29 18:51 /tmp/user_2.dbf
-rw-r--r-- 1 root root 1048576 Apr 29 18:51 /tmp/user_3.dbf
-rw-r--r-- 1 root root 1048576 Apr 29 18:51 /tmp/user_4.dbf
-rw-r--r-- 1 root root 2097152 Apr 29 18:51 /tmp/user_5.dbf
[root@rac1 ~]# dd if=/tmp/user_1.dbf bs=1024k count=1 of=/tmp/user_dd.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.0104619 seconds, 100 MB/s
[root@rac1 ~]# dd if=/tmp/user_2.dbf bs=1024k count=1 seek=1 of=/tmp/user_dd.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.0129077 seconds, 81.2 MB/s
[root@rac1 ~]# dd if=/tmp/user_3.dbf bs=1024k count=1 seek=2 of=/tmp/user_dd.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.00737324 seconds, 142 MB/s
[root@rac1 ~]# dd if=/tmp/user_4.dbf bs=1024k count=1 seek=3 of=/tmp/user_dd.dbf
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.0143482 seconds, 73.1 MB/s
[root@rac1 ~]# dd if=/tmp/user_5.dbf bs=1024k count=2 seek=4 of=/tmp/user_dd.dbf
2+0 records in
2+0 records out
2097152 bytes (2.1 MB) copied, 0.0809296 seconds, 25.9 MB/s
[root@rac1 ~]# ll /tmp/user_*
-rw-r--r-- 1 root root 1048576 Apr 29 18:50 /tmp/user_1.dbf
-rw-r--r-- 1 root root 1048576 Apr 29 18:51 /tmp/user_2.dbf
-rw-r--r-- 1 root root 1048576 Apr 29 18:51 /tmp/user_3.dbf
-rw-r--r-- 1 root root 1048576 Apr 29 18:51 /tmp/user_4.dbf
-rw-r--r-- 1 root root 2097152 Apr 29 18:51 /tmp/user_5.dbf