一、DBFS介绍

The Oracle Database File System (DBFS) creates a

standard file system interface on top

of files and directories that are stored indata base

tables. DBFS is similar to NFS in that

it provides a shared network file systemthat looks

like a local file system. Like NFS,

there is a server component and a clientcomponent.

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。

In DBFS, the server is the Oracle Database.Files are

stored as SecureFiles LOBs in a

database table. A set of PL/SQL proceduresimplement

the file system access

primitives such as create, open, read,write, and list

directory. The implementation of

the file system in the database is calledthe DBFS

Content Store. The DBFS Content

Store allows each database user to createone or more

file systems that can be mounted

by clients. Each file system has its owndedicated

tables that hold the file system

content.

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。

体系结构如下图所示

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：

或者

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

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 , pathtypefrom

t_dir1 ;

PATHNAMEITEMPATHTYPE

--------------------

----------------------------

/test.ttest.t1

/sub_dirsub_dir2

/sub_dir/test2.ttest2.t1

/ROOT2

/.sfs.sfs2

/.sfs/attributesattributes2

/.sfs/toolstools2

/.sfs/snapshotssnapshots2

/.sfs/RECYCLERECYCLE2

/.sfs/contentcontent2

10 rows

selected.

配置完成