053第484题

484.Which steps are mandatory to enable Direct NFS?
1. Mount all required file systems using the kernel NFS driver.
2. Create an oranfstab file containing the attributes for each NFS server to be accessed using Direct NFS.
3. Replace the ODM library libodm11.so_stub with libodm11.so.
A. 2 and 3
B. 1 and 3
C. 1 and 2
D. 1, 2 and 3
Answer: B

原答案选B，个人认为选A

To enable Direct NFS Client, you must add an 

oranfstab

 file
to 

Oracle_home

\dbs

.
When 

oranfstab

 is placed in this directory, the entries in this
file are specific to one particular database. Direct NFS Client searches for the mount point entries as they appear in 

oranfstab

.
Direct NFS Client uses the first matched entry as the mount point.

Complete the following procedure to enable Direct NFS Client:

Create an 

oranfstab

 file
with the following attributes for each NFS server accessed by Direct NFS Client:

server

: The NFS server name.

path

: Up to four network paths to the NFS server, specified either
by internet protocol (IP) address, or by name, as displayed using the 

ifconfig

command
on the NFS server.

local

: Up to 4 network interfaces on the database host, specified
by IP address, or by name, as displayed using the 

ipconfig

 command
on the database host.

export

: The exported path from the NFS server. Use a UNIX-style
path.

mount

: The corresponding local mount point for the exported volume.
Use Windows-style path.

mnt_timeout

: (Optional) Specifies the time (in seconds) for which
Direct NFS Client should wait for a successful mount before timing out. The default timeout is 10 minutes (600).

management

: Enables Direct NFS Client to use the management interface
for SNMP queries. You can use this parameter if SNMP is running on separate management interfaces on the NFS server. The default value is the 

server

 parameter
value.

community

: Specifies the community string for use in SNMP queries.
Default value is 

public

.

uid

: (Optional) The UNIX user ID to be used by Direct NFS Client
to access all NFS servers listed in 

oranfstab

. The default value
is 

uid:65534

, which corresponds to 

user:nobody

 on
the NFS server.

gid

: (Optional) The UNIX group ID to be used by Direct NFS Client
to access all NFS servers listed in 

oranfstab

. The default value
is 

gid:65534

, which corresponds to 

group:nogroup

 on
the NFS server.

The mount point specified in the 

oranfstab

 file represents the
local path where the database files would reside normally, as if Direct NFS Client was not used. For example, if the location for the data files if the database did not use Direct NFS Client would be 

C:\app\oracle\oradata\orcl

 directory,
then you specify 

C:\app\oracle\oradata\orcl

 for the NFS virtual
mount point in the corresponding 

oranfstab

 file.

Example 3-1 and Example
3-2 provide examples of how Direct NFS Client attributes can be used in an 

oranfstab

 file.

Note:

Direct NFS Client ignores a 

uid

 or 

gid

 value
of 

0

.

The exported path from the NFS server must be accessible for 

read/write/execute

 by
the user with the 

uid

, 

gid

 specified
in

oranfstab

. If neither 

uid

 nor 

gid

 is
listed, then the exported path must be accessible by the user with 

uid:65534

 and 

gid:65534

.

Replace the standard Oracle Disk Manager (ODM) library, 

oraodm11.dll

,
with the ODM NFS library.

Oracle Database uses the ODM library, 

oranfsodm11.dll

, to enable
Direct NFS Client. To replace the ODM library, complete the following steps:

Change directory to 

Oracle_home

\bin

.

Shut down the Oracle Database instance on a node using the Server Control Utility (SRVCTL).

Enter the following commands:

copy oraodm11.dll oraodm11.dll.orig
copy /Y oranfsodm11.dll oraodm11.dll

Restart the Oracle Database instance using SRVCTL.

Repeat Step a to Step d for each node in the cluster.