这篇文章主要介绍oracle中dbfs文件系统怎么用，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
一、DBFS介绍
Dbfs在文件和目录之上创建了一个标准的文件系统结构，并且将数据存储在数据库基表里面。DBFS很像NFS，因为它提供了一个与本地文件系统相同的共享的网络文件系统。与NFS一样，由Server与Client组成。
在DBFS中，Server为Oracle数据库，文件存储在表的一个SecureFiles LOBs 字段里面。一个PLSQL存储过程的集合，提供了访问文件系统的基本操作，比如说create、open、read、write，ls 。DBFS目录库允许每个数据库用户创建一个或多个文件系统，并且可以被clients使用。每个文件系统拥有专有的数据表，保证文件系统的内容。
二、Client端安装fuse
确定fuse版本
uname –a
Linux DB-SERVER-02 2.6.18-164.el5#1 SMP Tue Aug 18 15:51:48 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
本机kernelversion 2.6.18
Kernel version 2.6.x
x>9都需要使用 fuse-2.7.4
下载fuse安装包
下载地址：
http://fuse.sourceforge.net
或者
http://sourceforge.net/projects/fuse
检查kernel-devel 包
# rpm –q kernel-devel
如果没有安装，挂载安装盘后安装package
安装fuse
$ tar -xzvf fuse-2.7.4.tar.gz
$ cd [fuse_src_dir]
$ ./configure --prefix=/usr --with-kernel=[yourkernel dir]
$ make
$ sudo su
# make install
# /sbin/depmod
# /sbin/modprobe fuse
# chmod 666 /dev/fuse
# echo "/sbin/modprobe fuse" >>/etc/rc.modules
示例
查看是否安装了所需安装包
[root@mytest ~]# rpm -q kernel-devel
package kernel-devel is not installed
挂载光盘
[root@mytest dev]# mount /dev/hdc /mnt
mount: block device /dev/hdc iswrite-protected,
mounting read-only
安装kernel-devel包
[root@mytest Server]# rpm -ivh kernel-devel-2.6.18-308.el5.x86_64.rpm
Preparing... ########################################### [100%]
1:kernel-devel ###########################################[100%]
查看kernelversion
[root@mytest Server]# uname -a
Linux mytest 2.6.18-308.el5#1 SMP Sat Feb 25 12:40:07 EST 2012 x86_64 x86_64 x86_64 GNU/Linux
ftp 将fuse2.7.4 上传至服务器/root目录下
[root@mytest ~]# pwd
/root
[root@mytest ~]# ls -l fuse-2.7.4.tar.gz
-rw-r--r-- 1 root root 506658 Jun 11 13:54 fuse-2.7.4.tar.gz
解压
[root@mytest ~]# tar -xzvf fuse-2.7.4.tar.gz
[root@mytest ~]# cd fuse-2.7.4
安装
[root@mytest fuse-2.7.4]#./configure
[root@mytest fuse-2.7.4]#make
[root@mytest fuse-2.7.4]#make install
[root@mytest fuse-2.7.4]#/sbin/depmod
[root@mytest fuse-2.7.4]#/sbin/modprobe fuse
[root@mytest fuse-2.7.4]#chmod 666 /dev/fuse
[root@mytest fuse-2.7.4]#echo "/sbin/modprobe fuse" >> /etc/rc.modules
三、Server端Oracle数据库配置
Server端配置流程
1创建表空间
新建的表空间用来存储dbfs中相关数据。
2创建用户
新建用户用来管理dbfs相关的文件以及源数据
3授权
管理dbfs的用户需要拥有相关权限
4执行dbfs初始化脚本
Dbfs配置脚本路径：
$ORACLE_HOME/rdbms/admin/dbfs_create_filesystem_advanced
注意，需要使用新建的用户执行该脚本。
示例
使用dba用户登录
[oracle@mytest~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0Production on Thu Aug 2 13:40:42 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to an idle instance.
开启数据库
SQL>startup
ORACLE instance started.
Total System Global Area 1653518336 bytes
Fixed Size 2213896 bytes
Variable Size 956303352 bytes
Database Buffers 687865856 bytes
Redo Buffers 7135232 bytes
Database mounted.
Database opened.
创建表空间fsts（这里使用大文件表空间）
SQL>create bigfile tablespace fsts
2 datafile '/u01/apps/oracle/oradata/david/fsts01.dbf'
3 size500m ;
Tablespace created.
创建用户dexter
SQL> create user dexter identified byxiaojun default tablespace fsts quota unlimited on fsts ;
User created.
授权
SQL>grant create session,create table , create procedure , dbfs_role to dexter ;
Grant succeeded.
SQL> conn dexter/xiaojun
Connected.
执行初始化脚本
SQL>@?/rdbms/admin/dbfs_create_filesystem_advanced fsts dir1 nocompressnodeduplicate noencrypt non-partition
四、客户端挂载
客户端使用需要用到dbfs_client命令，相关的程序都在Oracle client中，所以客户端必须安装Oracle client。
客户端配置流程
1.使用root用户
2. Add a new library path.
Command：
# echo "/usr/local/lib" >>/etc/ld.so.conf.d/usr_local_lib.conf
3. Change directory to lib , and create thefollowing symbolic links to the
libclntsh.so.11.1 and libnnz11.so libraries.
Command：
# cd /usr/local/lib
# ln -s $ORACLE_HOME/lib/libclntsh.so.11.1
# ln -s $ORACLE_HOME/lib/libnnz11.so
4. Locate libfuse.so, and create a symbolic linkthis library.
# locate libfuse.so
determined_path /libfuse.so
Command：
# ln –s determined_path /libfuse.so
5. Run ldconfig to create the links and cache for the new symbolic links.
Command：
# ldconfig
6. Create a symbolic link to dbfs_client in /sbin as mount.dbfs.
Command：
# ln -s $ORACLE_HOME/bin/dbfs_client/sbin/mount.dbfs
7. Login as admin user. (Oracle recommends th atyou do not perform the next step
as root user.)
8. Mount the DBFS store.
Command：
% dbfs_client @/dbfsdb -owallet,rw,user,direct_io /mnt/dbfs
9. [Optional] To test if the previo us step wassuccessful, list the dbfs directory.
Command：
# ls /mnt/dbfs
后台执行：
nohup dbfs_client ETLUser@DBConnectString/mnt/dbfs < passwordfile.f &
示例
[oracle@mytest~]$ mkdir /u01/dbfs
[oracle@mytest~]$ ls -l /u01
drwxr-xr-x 2 oracle oinstall 4096 Aug 2 13:51 dbfs
[root@mytest~]# echo "/usr/local/lib" >>/etc/ld.so.conf.d/usr_local_lib.conf
[root@mytest~]# cd /usr/local/lib
[root@mytestlib]# ln -s /u01/apps/oracle/product/11gr2/db_1/lib/libclntsh.so.11.1
[root@mytestlib]# ln -s /u01/apps/oracle/product/11gr2/db_1/lib/libnnz11.so
[root@mytestlib]# find / -name libfuse.so
/usr/local/lib/libfuse.so
[root@mytestlib]# ln -s /usr/local/lib/libfuse.so
[root@mytestlib]# ldconfig
[root@mytestlib]# ln -s /u01/apps/oracle/product/11gr2/db_1/bin/dbfs_client/sbin/mount.dbfs
[root@mytestlib]# su - oracle
配置密码文件
使用oracle用户作为dbfs挂载的管理用户
创建密码文件
echo xiaojun > passwd.t
查看客户端的配置
[oracle@mytest~]$ vi $ORACLE_HOME/network/admin/tnsnames.ora
DAVID =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST =mytest)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = david)
)
)
远程可以登录
[oracle@mytest~]$ sqlplus dexter/xiaojun@david
SQL*Plus: Release 11.2.0.1.0Production on Thu Aug 2 14:17:32 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0- 64bit Production
With the Partitioning, OLAP, Data Mining andReal Application Testing options
SQL>
执行挂载命令
nohup dbfs_client dexter@david /u01/dbfs < passwd.t &
[1] 11665
[oracle@mytest ~]$ nohup: appending outputto `nohup.out'
[oracle@mytest ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 30G 15G 14G 53% /
/dev/sda3 3.9G 473M 3.3G 13% /tmp
tmpfs 2.0G 943M 1.1G 48% /dev/shm
/dev/hdc 3.7G 3.7G 0 100% /mnt
dbfs 1.5M 57K 1.4M 4% /u01/dbfs
五、测试
[oracle@mytest ~]$ ll /u01
drwxr-xr-x 3 root root 0 Aug 2 14:20 dbfs
[oracle@mytest ~]$ ll /u01/dbfs/
total 0
drwxrwxrwx 3 root root 0 Aug 2 14:09 dir1
[oracle@mytest~]$ echo test > /u01/dbfs/dir1/test.t
[oracle@mytest~]$ ll /u01/dbfs/dir1/
total 1
-rw-r--r--1 oracle oinstall 5 Aug 2 14:21 test.t
[oracle@mytest ~]$ cat /u01/dbfs/dir1/test.t
Test
[oracle@mytest~]$ mkdir /u01/dbfs/dir1/sub_dir
[oracle@mytest~]$ echo ffccddssdd > /u01/dbfs/dir1/sub_dir/test2.t
[oracle@mytest~]$ sqlplus dexter/xiaojun@david
SQL*Plus: Release 11.2.0.1.0Production on Thu Aug 2 14:28:49 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0- 64bit Production
With the Partitioning, OLAP, Data Mining andReal Application Testing options
Pathtype=1 表示文件 2表示目录
[sql] view plaincopyprint?
1. SQL> select pathname , item , pathtype from t_dir1 ;
2. PATHNAME ITEM PATHTYPE
3. -------------------- ----------------------------
4. /test.t test.t 1
5. /sub_dir sub_dir 2
6. /sub_dir/test2.t test2.t 1
7. / ROOT 2
8. /.sfs .sfs 2
9. /.sfs/attributes attributes 2
10. /.sfs/tools tools 2
11. /.sfs/snapshots snapshots 2
12. /.sfs/RECYCLE RECYCLE 2
13. /.sfs/content content 2
14.
15. 10 rows selected.
SQL> select pathname , item , pathtype from t_dir1 ;
PATHNAME ITEM PATHTYPE
-------------------- ----------------------------
/test.t test.t 1
/sub_dir sub_dir 2
/sub_dir/test2.t test2.t 1
/ ROOT 2
/.sfs .sfs 2
/.sfs/attributes attributes 2
/.sfs/tools tools 2
/.sfs/snapshots snapshots 2
/.sfs/RECYCLE RECYCLE 2
/.sfs/content content 2
10 rows selected.
配置完成
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