DBFS on Oracle Exadata

Follow below steps to create DBFS

Create the mount point for DBFS

[root@db01 ]# mkdir /dbfs_dir

Login with Oracle user

[root@db1 ]# su - oracle

Set the Oracle Database environment variable to connect the your database.

Connect Database as sysdba

[oracle@db01 ~]$ sqlplus  / as sysdba

Create tablespace on ASM disk group

SQL> create tablespace dbfsts datafile '+DATA' size 1G;

SQL> create user dbfs_usr identified by Dbfs_pwd1 default tablespace dbfsts quota unlimited on dbfsts;

SQL> grant create session, create table, create procedure, dbfs_role to dbfs_usr;

You can use below syntax to create bigfile tablespace.

create bigfile tablespace dbfsts datafile '+DATA' size 2048g autoextend off nologging extent management local;

Go to admin directory of oracle binaryand run the below procedure

$cd $ORACLE_HOME/rdbms/admin

$sqlplus dbfs_usr/Dbfs_pwd1

SQL> start dbfs_create_filesystem_advanced dbfsts FS nocompress nodeduplicate noencrypt non-partition

Above procedure should run without errors.

TEST DBFS SETUP

[oracle@db01 ~]$ echo Dbfs_pwd1 > pwd.txt

[oracle@db01 ~]$ nohup $ORACLE_HOME/bin/dbfs_client dbfs_usr@test /dbfs_dir < pwd.txt &

- 'test' is database name

- '&' to run the process in background

- '/dbfs_dir' is a directory on which DBFS will be mounted

LOGIN to Oracle USER account from another terminal and check the DBFS file system

[oracle@db01 ~]$ cd /dbfs_dir/FS

[oracle@db01 ~]$ touch test.txt

[oracle@db01 ~]$ ls -ltr test.txt

LOGIN to root USER account from another terminal and check whether you can get acces of the DBFS file system

[root@db01 ]# cd /dbfs_dir/FS

Permission Denied

To unmount the file system issue the following command from the "root" OS user.

[root@db01 ]# fusermount -u /dbfs_dir

To allow other users ( example root to access the filesystem )

[oracle@dbs1 ]$ su - root

Password :

[root@db01 ]# echo user_allow_other > /etc/fuse.conf

change permission of /etc/fuse.conf to 644

[root@db01 ]#chmod 644 /etc/fuse.conf

[root@db01 ]# su - oracle

[oracle@db01 ~]$ nohup $ORACLE_HOME/bin/dbfs_client dbfs_usr@test -o direct_io,allow_root /dbfs_dir < pwd.txt &

You can check nohup file for any error logs.

Login to root user account from another terminal and check the accessibility of DBFS

[root@db01 ]# cd /dbfs_dir/FS

[root@db01 ]# ls -lt test.txt

To unmount the file system issue the following command from the "root" OS user.

# fusermount -u /dbfs_dir