创建DBFS

发表于 2012 年 9 月 17 日 由 惜分飞

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标题：创建DBFS

作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

DBFS(Oracle Database File System)就是Oracle数据库11gR2中提供的能够在Linux和Solaris操作系统中将Oracle数据库当成文件系统来使用的功能.在DBFS内部,文件是以SecureFiles LOBs（对比与以前的BasicFiles LOBs）的形式存储在数据表中.这个功能第一个是存储图片或者文档,第二个功能就是在RAC或者XD中部署OGG是一个不错的选择.
安装fuse相关包

[root@xifenfei ~]# mount /dev/cdrom /media
mount: block device /dev/cdrom is write-protected, mounting read-only
[root@xifenfei ~]# cd /media/Server
[root@xifenfei Server]# ls fuse*
fuse-2.7.4-8.0.1.el5.x86_64.rpm      fuse-devel-2.7.4-8.0.1.el5.x86_64.rpm  fuse-libs-2.7.4-8.0.1.el5.x86_64.rpm
fuse-devel-2.7.4-8.0.1.el5.i386.rpm  fuse-libs-2.7.4-8.0.1.el5.i386.rpm
[root@xifenfei Server]# rpm -ivh fuse-libs-2.7.4-8.0.1.el5.x86_64.rpm
warning: fuse-libs-2.7.4-8.0.1.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
Preparing...                ########################################### [100%]
   1:fuse-libs              ########################################### [100%]
[root@xifenfei Server]# rpm -ivh  fuse-devel-2.7.4-8.0.1.el5.x86_64.rpm
warning: fuse-devel-2.7.4-8.0.1.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
Preparing...                ########################################### [100%]
   1:fuse-devel             ########################################### [100%]

[root@xifenfei Server]# rpm -ivh  fuse-2.7.4-8.0.1.el5.x86_64.rpm
warning: fuse-devel-2.7.4-8.0.1.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159
Preparing...                ########################################### [100%]
   1:fuse                   ########################################### [100%]

系统配置

[root@xifenfei Server]# cd /
[root@xifenfei /]# mkdir dbfs
[root@xifenfei /]# chown ora11g:oinstall dbfs
[root@xifenfei /]# ls -l|grep dbfs
drwxr-xr-x   2 ora11g oinstall  4096 Sep  1 16:41 dbfs
[root@xifenfei /]# echo "/usr/local/lib" >> /etc/ld.so.conf.d/usr_local_lib.conf
[root@xifenfei /]# export ORACLE_HOME=/u01/oracle11
[root@xifenfei /]# ln -s $ORACLE_HOME/lib/libclntsh.so.11.1 /usr/local/lib/libclntsh.so.11.1
[root@xifenfei /]# ln -s $ORACLE_HOME/lib/libnnz11.so /usr/local/lib/libnnz11.so
[root@xifenfei /]# ln -s /lib64/libfuse.so.2 /usr/local/lib/libfuse.so.2
[root@xifenfei /]# cd /usr/local/lib
[root@xifenfei lib]# ls -l
total 0
lrwxrwxrwx 1 root root 35 Sep  1 16:45 libclntsh.so.11.1 -> /u01/oracle11/lib/libclntsh.so.11.1
lrwxrwxrwx 1 root root 19 Sep  1 16:46 libfuse.so.2 -> /lib64/libfuse.so.2
lrwxrwxrwx 1 root root 29 Sep  1 16:46 libnnz11.so -> /u01/oracle11/lib/libnnz11.so
[root@xifenfei lib]# ldconfig
[root@xifenfei lib]# chmod +x /usr/bin/fusermount
[root@xifenfei lib]# ls -l /usr/bin/fusermount
lrwxrwxrwx 1 root root 15 Sep  1 16:37 /usr/bin/fusermount -> /bin/fusermount
[root@xifenfei lib]#  ls -l /bin/fusermount
-rwsr-x--x 1 root fuse 23544 Oct 18  2011 /bin/fusermount

相关表空间/用户配置

SQL> create tablespace dbfs_ts 
  2  datafile '/u01/oradata/ora11g/xifenfei01.dbf' 
  3  size 20m autoextend on next 10m maxsize 30g;

Tablespace created.

SQL> create user dbfs  identified by dbfs
  2   default tablespace dbfs_ts
  3   quota unlimited on dbfs_ts;

User created.

SQL> grant create session, resource, create view, dbfs_role to dbfs ;

Grant succeeded.

创建filesystem

[ora11g@xifenfei admin]$ cd $ORACLE_HOME/rdbms/admin
[ora11g@xifenfei admin]$ sqlplus dbfs/dbfs@ora11g

SQL*Plus: Release 11.2.0.3.0 Production on Sat Sep 1 16:43:04 2012

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> @dbfs_create_filesystem.sql dbfs_ts my_dbfs
No errors.
--------
CREATE STORE:
begin dbms_dbfs_sfs.createFilesystem(store_name => 'FS_MY_DBFS', tbl_name =>
'T_MY_DBFS', tbl_tbs => 'dbfs_ts', lob_tbs => 'dbfs_ts', do_partition => false,
partition_key => 1, do_compress => false, compression => '', do_dedup => false,
do_encrypt => false); end;
--------
REGISTER STORE:
begin dbms_dbfs_content.registerStore(store_name=> 'FS_MY_DBFS', provider_name
=> 'sample1', provider_package => 'dbms_dbfs_sfs'); end;
--------
MOUNT STORE:
begin dbms_dbfs_content.mountStore(store_name=>'FS_MY_DBFS',
store_mount=>'my_dbfs'); end;
--------
CHMOD STORE:
declare m integer; begin m := dbms_fuse.fs_chmod('/my_dbfs', 16895); end;
No errors.

挂载dbfs

[ora11g@xifenfei ~]$ more /home/ora11g/xifenfei_pwd 
dbfs
[ora11g@xifenfei ~]$ nohup dbfs_client dbfs@ora11g /dbfs <xifenfei_pwd &
[1] 3694
[ora11g@xifenfei ~]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      3.9G  3.2G  462M  88% /
/dev/sda1              99M   24M   71M  25% /boot
tmpfs                1002M  184M  818M  19% /dev/shm
/dev/sdb1              20G  8.9G  9.9G  48% /u01
df: `/dbfs': Resource temporarily unavailable

查询mos发现 OS 2.6.32-100.26.2.el5 to: 2.6.32-300.10.1.el5uek (Linux UEK Kernel)会出现该问题,解决方法是升级Kernel或者不使用UEK

[ora11g@xifenfei ~]$ uname -a
Linux xifenfei 2.6.32-300.10.1.el5uek #1 SMP Wed Feb 22 17:37:40 EST 2012 x86_64 x86_64 x86_64 GNU/Linux

不幸刚好中招,现在升级是不太可能的事情,只能使用其他kernel来启动系统(下图选择第二个)

重新挂载dbfs并且测试

[ora11g@xifenfei ~]$ uname -a
Linux xifenfei 2.6.18-308.el5 #1 SMP Sat Feb 25 12:40:07 EST 2012 x86_64 x86_64 x86_64 GNU/Linux
[ora11g@xifenfei ~]$ nohup dbfs_client dbfs@ora11g /dbfs <xifenfei_pwd &
[1] 3694
[ora11g@xifenfei ~]$ nohup: appending output to `nohup.out'
[ora11g@xifenfei ~]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      3.9G  3.2G  462M  88% /
/dev/sda1              99M   24M   71M  25% /boot
tmpfs                1006M  184M  822M  19% /dev/shm
/dev/sdb1              20G  8.9G  9.9G  48% /u01
dbfs-dbfs@ora11g:/     19M  120K   19M   1% /dbfs
[ora11g@xifenfei ~]$ cd /dbfs
[ora11g@xifenfei dbfs]$ ls
my_dbfs
[ora11g@xifenfei dbfs]$ cd my_dbfs/
[ora11g@xifenfei my_dbfs]$ ls
[ora11g@xifenfei my_dbfs]$ cat /etc/passwd>xifenfei.chf
[ora11g@xifenfei my_dbfs]$ ll
total 2
-rw-r--r-- 1 ora11g oinstall 1736 Sep  1 21:05 xifenfei.chf

卸载dbfs

[ora11g@xifenfei ~]$ fusermount -u /dbfs
[ora11g@xifenfei ~]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      3.9G  3.2G  462M  88% /
/dev/sda1              99M   24M   71M  25% /boot
tmpfs                1006M  184M  822M  19% /dev/shm
/dev/sdb1              20G  8.9G  9.9G  48% /u01

删除filesystem

cd $ORACLE_HOME/rdbms/admin
sqlplus dbfs_user/dbfs_user
SQL> @dbfs_drop_filesystem.sql my_dbfs
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《创建DBFS》有 2 条评论

  1. 惜分飞 说：
    2012 年 9 月 19 日19:57

    完善mount方法

    echo dbfs | nohup ${ORACLE_HOME}/bin/dbfs_client dbfs@q4dbfs -o direct_io,allow_other /home/oracle/q4dbfs &

--echo后面的dbfs是dbfs的密码
--dbfs@q4dbfs是dbfs的用户和tns名
--/home/oracle/q4dbfs是mount的目录
  2. 惜分飞 说：
    2012 年 9 月 17 日00:55

    Alert: DBFS Is Not Working After Upgrade Linux Kernel To UEK Linux. [ID 1434327.1]

    Applies to:
Oracle Server - Enterprise Edition - Version: 11.2.0.1 to 11.2.0.3 - Release: 11.2 to 11.2
Linux x86
Linux x86-64

Description
After upgrade Linux kernel (e.g. 2.6.32-100.26.2.el5) to UEK (e.g. 2.6.32-300.10.1.el5uek) DBFS is not working.
Likelihood of Occurrence

1) OS upgrade from 2.6.32-100.26.2.el5 to: 2.6.32-300.10.1.el5uek (Linux UEK Kernel).

2) After boot the Linux server using the UEK kernel, DBFS reports the next problems:

$> nohup dbfs_client -o allow_other dbfs@EUSPRD /mnt_dbfs < ~/passwordfile.f &

$> df -k
df: `/mnt_dbfs': Resource temporarily unavailable

3) But, if the Linux box is booted again with the previous kernel release (non-UEK) then DBFS has not issues.


Possible Symptoms
1) DBFS fails after system boots using an UEK kernel.
2) DBFS development team confirmed:

There is some issue in fuse in recent UEK kernel releases (e.g. 2.6.32-300.7.2.el5uek).

It's fixed in newer kernel (v2.6.32-300.11.1) which is due for a release. 
fuse user and library rpm is also due for a release.

Workaround or Resolution
Therefore, please continue using the previous kernel release 
((boot the system with the previous kernel release (non- UEK))) for your DBFS configuration, 
until the new kernel v2.6.32-300.11.1 is released.