Oracle 1Z0-821 Online Practice Questions and Exam Preparation

Oracle 1Z0-821 Online Questions & Answers

• Question 101:

  You are troubleshooting the failure of a computer to mount an NFS file system hosted by a server (hostname mars) in the local area network.

  Select the three commands that will enable you to identify the problem.

  A. ping - s mars
  B. cat /etc/vfstab
  C. cat /etc/dfs/dfstab
  D. sharemgr show -v
  E. showmount -e mars
  F. rpcinfo -s mars | egrep `nfs|mountd'
  B. cat /etc/vfstab
  E. showmount -e mars
  F. rpcinfo -s mars | egrep `nfs|mountd'

  ---

  B: The mount point Error. The following message appears during the boot process or in response toan explicit mount request and indicates a non-existent mount point.

  Mount: mount-point /DS9 does not exist.

  To solve the mount point error condition, check that the mount point exists on the client. Check the spelling of the mount point on the command line or in the /etc/vfstab file (B) on the client, or comment outthe entry and reboot the system.

  Note: The /etc/vfstab file lists all the file systems to be automatically mounted at system boot time, with the exception of the /etc/mnttab and /var/run file systems.

  E: showmount This command displays all clients that have remotely mounted file systems that are shared from an NFS server, or only the file systems that are mounted by clients, or the shared file systems with the client access information. The command syntax is:

  showmount [ -ade ] [ hostname ]

  where -a prints a list of all the remote mounts (each entry includes the client name and the directory), -d prints a list of the directories that are remotely mounted by clients, -e prints a list of the files shared (or exported), and hostname selects the NFS server to gather the information from. If hostname is not specified the local host is queried.

  F: * mountd Daemon

  This daemon handles file-system mount requests from remote systems and provides access control. The mountd daemon checks /etc/dfs/sharetab to determine which file systems are available for remote mounting and which systems are

  allowed to do the remote mounting.

  * Commands for Troubleshooting NFS Problems

  These commands can be useful when troubleshooting NFS problems.

  rpcinfo Command

  This command generates information about the RPC service that is running on a system.

• Question 102:

  New features wore added to ZFS in Oracle Solaris11. Your justification to upgrade from Solaris10 to oracle Solaris11 is that it will be possible to take advantage of the enhancements that were made to ZFS. Identify the three ZFS functions and features that are included in Oracle Solaris 11, but not in Solaris 10.

  A. Encrypted ZFS datasets
  B. Ability for ZFS to detect and remove redundant data from the tile system
  C. Shadow Data Migration
  D. Ability to split a mirrored ZFS storage pool
  E. Ability to use ZFS on the boot drive and boot to a ZFS root file system.
  F. elimination of the swap file system when using ZFS on the root disk
  A. Encrypted ZFS datasets
  B. Ability for ZFS to detect and remove redundant data from the tile system
  C. Shadow Data Migration

  ---

  http://www.oracle.com/technetwork/server-storage/solaris11/overview/solaris-matrix- 1549264.html

• Question 103:

  In an effort to reduce storage space on your server, you would like to eliminate duplicate copies of data in your server's ZFS file systems. How do you specify that pool1/data should not contain duplicate data blocks (redundant data) on write operations?

  A. zfs create - o compression=on pool1/data
  B. zpool create -o deduplication =on pool1; zfs create pool1/data
  C. zfs create - o deduplication=on pool1; zfs create pool1/data
  D. zfs create - o dedupratio=2 pool1/data
  E. zfs create - o dedup=on pool1/data
  E. zfs create - o dedup=on pool1/data

  ---

  ZFS Deduplication Property Solaris Express Community Edition, build 129: In this Solaris release, you can use the deduplication property to remove redundant data from your ZFS file systems. If a file system has the dedup property enabled, duplicate data blocks are removed synchronously. The result is that only unique data is stored and common components are shared between files.

  You can enable this property as follows: # zfs set dedup=on tank/home

• Question 104:

  The crash dump notification on your server is:

  

  Documentation states that there should be two core files for each crash dump in the /var/crash directory named vmdump.0

  Which command should you choose to display theses two files?

  A. savecore -f vmdump.0
  B. dumpadm uncompressed
  C. gunzip vmdump.0
  D. dumpadm -z off
  A. savecore -f vmdump.0

  ---

  Decompress using savecore -f vmdump.0

  savecore - save a crash dump of the operating system

  -f dumpfile Attempt to save a crash dump from the specified file instead of from the system's current dump device. This option may be useful if the information stored on the dump device has been copied to an on-disk file by means of the dd (1M) command.

• Question 105:

  Which two options are characteristics of a fast reboot?

  A. A fast reboot bypasses grub.
  B. A fast reboot cannot be used after a system panic on the x86 platform.
  C. A fast reboot can only be executed on the SPARC platform when the config/fastreboot_default property for the svc:/system/boot-config:default service is set to true.
  D. A fast reboot uses an in-kernel boot loader to load the kernel into memory.
  E. A fast reboot is the default on all platforms.
  C. A fast reboot can only be executed on the SPARC platform when the config/fastreboot_default property for the svc:/system/boot-config:default service is set to true.
  D. A fast reboot uses an in-kernel boot loader to load the kernel into memory.

  ---

  C: To change the default behavior of the Fast Reboot feature on the SPARC platform, so that a fast reboot is automatically performed when the system reboots, see below.

  The following example shows how to set the property's value to true on the SPARC platform, so that a fast reboot is initiated by default:

  # svccfg -s "system/boot-config:default" setprop config/fastreboot_default=true # svcadm refresh svc:/system/boot-config:default

  D: Fast Reboot implements an in-kernel boot loader that loads the kernel into memory and then switches to that kernel.

  The firmware and boot loader processes are bypassed, which enables the system to reboot within seconds.

  The Fast Reboot feature is managed by SMF and implemented through a boot configuration service, svc:/system/boot-config. The boot-config service provides a means for setting or changing the default boot configuration parameters. When

  the config/fastreboot_default property is set to true, the system performs a fast reboot automatically, without the need to use the reboot -f command. This property's value is set to true on the x86 platform. For task-related information, including

  how to change the default behavior of Fast Reboot on the SPARC platform, see Accelerating the Reboot Process on an x86 Based System.

  Note: One new feature, called Fast Reboot, will allow the system to boot up without doing the routine set of hardware checks, a move that can make system boot times up to two- and-a-half times faster, Oracle claimed. This feature can be

  handy in that an administrator applying a patch or software update across thousands of Solaris deployments can reboot them all the more quickly.

• Question 106:

  You want the system to generate an email notification each time one of the services has changed its state. Which option would send an email message to the system administrator whenever a service changes to the maintenance state?

  A. Use the setsc command in ALOM to enable the mail alerts to be sent to a specified email address whenever the fault management facility detects a service change to the maintenance state.
  B. Make an entry in the /etc/syslog.conf file to instruct syslogd to send an email alert when it receives a message from the SMF facility that a service has changed to the maintenance state.
  C. Use the svccfg setnotify command to create a notification and send an email when a service enters the maintenance state.
  D. Use the scvadm command to enable the notification service. Set the
  C. Use the svccfg setnotify command to create a notification and send an email when a service enters the maintenance state.

  ---

  This procedure causes the system to generate an email notification each time one of the services or a selected service has a change in state. You can choose to use either SMTP or SNMP. Normally, you would only select SNMP if you already have SNMP configured for some other reason.

  By default, SNMP traps are sent on maintenance transitions. If you use SNMP for monitoring, you can configure additional traps for other state transitions.

  1. Become an administrator or assume a role that includes the Service Management rights profile.

  2. Set notification parameters.

  Example: The following command creates a notification that sends email when transactions go into the maintenance state # /usr/sbin/svccfg setnotify -g maintenance mailto:[email protected]

• Question 107:

  Review the zonestat command:

  zonestate - q physical - memory -R high -z -p -p "zones" 10 24h 60m

  Select the option that correctly describes the information that is displayed by this command.

  A. It is a sample of dbzone's physical memory usage taken every hour over a 24-hour period.Only the top 10 samplings of peak memory usage are displayed. All other utilization data is eliminated.
  B. It is a sample of dbzone's CPU, virtual memory, and networking utilization.Physical memory is executed from the report.The sampling is taken every 10 minutes over a 24- hour period and peak utilization id displayed each hour.
  C. It is a sample of dbzone's CPU, virtual memory, and networking utilization.Physical memory is executed from the report.The sampling is taken every 10 minutes over a 24- hour period and displayed each hour.
  D. It is a sample of dbzone's physical memory usage taken every 10 seconds and 24-hour period.Only peak virtual memory usage and CPU utilization are displayed each hour.All other Utilization data is eliminated.
  E. It is a sample of dbzone's physical memory usage taken every 10 seconds and 24-hour period.Only peak memory usage is displayed each hour.All other utilization data is eliminated.
  D. It is a sample of dbzone's physical memory usage taken every 10 seconds and 24-hour period.Only peak virtual memory usage and CPU utilization are displayed each hour.All other Utilization data is eliminated.

  ---

  *

  (Not A, B, C): interval (here 10 seconds): Specifies the length in seconds to pause between each interval report.

  *

  duration (here 24 h)

  * -R report[, report] (here high)

  Print a summary report.

  High Print a summary report detailing the highest usage of each resource and zone during any interval of the zonestat utility invocation.

  Note: The zonestat utility reports on the cpu, memory, and resource control utilization of the currently running zones. Each zone's utilization is reported both as a percentage of system resources and the zone's configured limits.

  The zonestat utility prints a series of interval reports at the specified interval. It optionally also prints one or more summary reports at a specified interval.

  The default output is a summary of cpu, physical, and virtual memory utilization. The -r option can be used to choose detailed output for specific resources.

• Question 108:

  You are having an issue with the shutdown command. You wish to determine if the file is a script or an executable program. Which command would you use to determine this?

  A. od shutdown
  B. file shutdown
  C. test shutdown
  D. cksum shutdown
  E. attrib shutdown
  B. file shutdown

  ---

  The file command determines the file type file tests each argument in an attempt to classify it. There are three sets of tests, performed in this order: filesystem tests, magic tests, and language tests. The first test that succeeds causes the file type to be printed.

• Question 109:

  User1 is attempting to assist user2 with terminating user2's process 1234.

  User1 entered the following: kill -9 1234

  Why does the process continue to run?

  A. You can kill a process only if you are root.
  B. You can kill only a process that you own.
  C. You can kill the process only with the pkill command.
  D. You need to kill the process with a stronger kill signal.
  B. You can kill only a process that you own.

  ---

  Kill -9 Kill (terminates without cleanup) Only works if issued by process owner or super user (root) The program cannot respond to this signal; it must terminate

  Note: Unix provides security mechanisms to prevent unauthorized users from killing other processes. Essentially, for a process to send a signal to another, the owner of the signaling process must be the same as the owner of the receiving process or be the superuser.

• Question 110:

  Consider the following commands:

  

  What is displayed when this sequence of commands is executed using the bash shell?

  A. Hello, world
  B. cat: cannot open file1
  C. cat: cannot open file1Hello, world
  D. cat: cannot open file1 Hello, World
  E. bash: syntax error near unexpected token 'andand'
  B. cat: cannot open file1

  ---

  First line (rm file1) deletes/removes file1.

  Second line captures the text into file2.

  The first part of line 3 (cat file1) fails as the file1 does not exist. The andand (AND) operator will ensure that the third line fails. The result of line 3 will be the result of first part of line 3 (cat file1).

  Note: cat - concatenate files and print on the standard output

  Note #1: A list is a sequence of one or more pipelines separated by one of the operators `;', `and', `andand', or `||', and optionally terminated by one of `;', `and', or a newline.

  Of these list operators, `andand' and `||' have equal precedence, followed by `;' and `and', which have equal precedence.

  AND and OR lists are sequences of one or more pipelines separated by the control operators `andand' and `||', respectively. AND and OR lists are executed with left associativity.

  An AND list has the form

  command1 andand command2

  command2 is executed if, and only if, command1 returns an exit status of zero.

  An OR list has the form

  command1 || command2

  command2 is executed if, and only if, command1 returns a non-zero exit status.

  The return status of AND and OR lists is the exit status of the last command executed in the list.

  Note #2 (on exit status): Zero means command executed successfully, if exit status returns non-zero value then your command failed to execute.