Oracle 1Z0-821 Online Practice Questions and Exam Preparation

Oracle 1Z0-821 Online Questions & Answers

• Question 211:

  The ZFS configuration on your server is:

  Pool1 6.67G31K/pool

  Pool1/data31K31K/data

  Select the three commands that you would use to 1. Create, 2. List, and 3. Delete a snapshot of the /data file system.

  A. zfs snapshot pool1/data@now
  B. zfs create snapshot pool1/data@now
  C. zfs list -t snapshot
  D. zfs list -t snapshot pool1/data
  E. zfs destroy pool1/data@now
  F. zfs destroy snapshot pool1/data@now
  A. zfs snapshot pool1/data@now
  D. zfs list -t snapshot pool1/data
  E. zfs destroy pool1/data@now

  ---

  A: Snapshots are created by using the zfs snapshot command, which takes as its only argument the name of the snapshot to create.

  D: You can list snapshots as follows: # zfs list -t snapshot

  E: Snapshots are destroyed by using the zfs destroy command. For example:

  # zfs destroy tank/home/ahrens@now

• Question 212:

  You have been asked to terminate a process that appears to be hung and will not terminate. The process table is shown below:

  root 15163 15156 0 12:51:15 pts/3 0:00 hungscript

  What command will terminate the process?

  A. kill -9 15163
  B. kill -1 15163
  C. kill -15 15163
  D. kill -2 15163
  A. kill -9 15163

  ---

  Here we should use SIGTERM to terminate the process.

  Note:

  When no signal is included in the kill command-line syntax, the default signal that is used is ?5 (SIGKILL). Using the ? signal (SIGTERM) with the kill command ensures that the process terminates promptly. However, the ? signal should not

  be used to kill certain processes, such as a database process, or an LDAP server process. The result is that data might be lost.

  Tip - When using the kill command to stop a process, first try using the command by itself, without including a signal option. Wait a few minutes to see if the process terminates before using the kill command with the -9 signal.

• Question 213:

  Review the storage pool information:

  

  Choose the correct procedure to repair this storage pool.

  A. Shut the system down, replace disk c3t3d0, and boot the system. When the system is booted, execute the zpool clear pool1 command.
  B. Shut the system down, replace disk c3t3d0, and boot the system. When the system is booted execute the zpool online pool1 command.
  C. Shut the system down, replace disk c3t3d0, and boot the system. When the system is booted, execute the zpool replace pool1 c3t3d0 command.
  D. Shut the system down, replace disk c3t3d0, and boot the system. When the system is booted, execute the zpool replace pool1 c3t3d0 c3t3d0 command.
  C. Shut the system down, replace disk c3t3d0, and boot the system. When the system is booted, execute the zpool replace pool1 c3t3d0 command.

  ---

  You might need to replace a disk in the root pool for the following reasons:

  The root pool is too small and you want to replace it with a larger disk

  The root pool disk is failing. In a non-redundant pool, if the disk is failing so that the system won't boot, you'll need to boot from an alternate media, such as a CD or the network, before you replace the root pool disk. In a mirrored root pool configuration, you might be able to attempt a disk replacement without having to boot from alternate media. You can replace a failed disk by using the zpool replace command.

  Some hardware requires that you offline and unconfigure a disk before attempting the zpool replace operation to replace a failed disk.

  For example: # zpool offline rpool c1t0d0s0 # cfgadm -c unconfigure c1::dsk/c1t0d0 # cfgadm -c configure c1::dsk/c1t0d0 # zpool replace rpool c1t0d0s0 # zpool online rpool c1t0d0s0 # zpool status rpool SPARC# installboot -F zfs /usr/platform/`uname -i`/lib/fs/zfs/bootblk /dev/rdsk/c1t0d0s0 x86# installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c1t9d0s0

• Question 214:

  Your are troubleshooting network throughput on your server.

  To confirm that the load balancing among aggregated links is functioning properly, you want to examine the traffic statistics on the links comprising the aggregation.

  The correct command is ___________.

  A. dlstat - aggr
  B. dlstat show-aggr
  C. dlstat show-link -r
  D. dlstat show-link -aggr
  E. dlstat show-phys -aggr
  B. dlstat show-aggr

  ---

  dlstat show-aggr [-r | -t] [-i interval] [-p] [ -o field[, ...]] [-u R|K|M|G|T|P] [link] Display per-port statistics for an aggregation.

• Question 215:

  A user on the system has started a process, but it needs to be terminated.

  The process ID was determined as follows:

  pgrep userprogram

  l5317

  The user attempted to terminate the program as follows:

  pkill 15317

  This command runs without an error message, and the process continues to run.

  What is the issue?

  A. You need to run the pkill command with the process name.
  B. You need to switch to super user to kill the process.
  C. You need to run the ps command to get more information.
  D. You need to run the prstat command to get more information.
  B. You need to switch to super user to kill the process.

  ---

  You can use the pgrep and pkill commands to identify and stop command processes that you no longer want to run. These commands are useful when you mistakenly start a process that takes a long time to run.

  To terminate a process:

  Type pgrep to find out the PID(s) for the process(es).

  Type pkill followed by the PID(s).

  You can kill any process that you own. Superuser can kill any process in the system except for those processes with process IDs of 0, 1, 2, 3, and 4. Killing these processes most likely will crash the system.

• Question 216:

  Server A, Server B, and Server C are connected to the same network switch and are on the sari Each server has a single network interface, net0.

  You received a tech support call that Server B has lost network connectivity. Your troubleshooting has discovered:

  Server A can ping Server C, but not Server B.

  Server B can ping localhost, but not Server A or C.

  Server C can ping Server A, but not Server B.

  On Server F3, you enter the following command:

  dladm show-phys | grep net0

  Response:

  net0/v4 Ethernet down 0 unknown el00gl

  What is the next logical troubleshooting action?

  A. Run arp -a on all servers.
  B. Confirm that the router is working.
  C. Confirm that the power light of the network switch is on.
  D. Confirm that the physical network connections are intact.
  E. On Server A and C, run tranceroute –n server.
  F. On Server B, run tranceroute –n servera and tranceroute –n serverc.
  D. Confirm that the physical network connections are intact.

  ---

  Check the physical connection.

• Question 217:

  After installing the OS, you boot the system and notice that the syslogd daemon is not accepting messages from remote systems. Which two options should you select to modify the syslogd daemon configuration so that it accepts messages from remote systems?

  A. svccfg -s svc:/system/system -log setprop start/exec= "syslogd -t"Restart the syslogd daemon.
  B. Set the following parameter in the /etc/syslogd.conf file: LOG_FROM_REMOTE= YESRestart the syslogd daemon.
  C. svcadm enable svc:/system/system -log/config/log_from_remoteRestart the syslogd daemon.
  D. svccfg -s svc:/system/system-log setprop config/log_from_remote=trueRestart the syslogd daemon.
  E. Set the following parameter in the /etc/default/syslogd file: LOG_FROM_REMOTE=YESRestart the syslogd daemon.
  B. Set the following parameter in the /etc/syslogd.conf file: LOG_FROM_REMOTE= YESRestart the syslogd daemon.
  D. svccfg -s svc:/system/system-log setprop config/log_from_remote=trueRestart the syslogd daemon.

  ---

  B: The /etc/default/syslogd file contains the following default parameter settings. See FILES.

  LOG_FROM_REMOTE

  Specifies whether remote messages are logged. LOG_FROM_REMOTE=NO is equivalent to the -t command-line option. The default value for LOG_FROM_REMOTE is YES.

• Question 218:

  Which two are true about accounts, groups, and roles in the Solaris user database?

  A. All Solaris user accounts must have a unique UID number.
  B. A Solaris account name may be any alphanumeric string, and can have a maximum length of 8 characters.
  C. Account UID numbers 0-09 are system-reserved.
  D. The GID for an account determines the default group ownership of new files created by that account.
  E. The groups that an account is a member of are determined by the entries in the /etc/group file.
  A. All Solaris user accounts must have a unique UID number.
  B. A Solaris account name may be any alphanumeric string, and can have a maximum length of 8 characters.

  ---

  A: Solaris uses a UID (User ID) to identify each user account. The UID is a unique number assigned to each user. It is usually assigned by the operating system when the account is created.

  B: In Solaris the account name can include any alphanumeric string (and . _ -). The maximum length is 8 characters.

• Question 219:

  _________ serves as the interface between the SMF repository and the user to ensure that a consistent, picture of the repository is presented to the user.

  A. repository.db
  B. service manifest
  C. svc.startd
  D. svc.configd
  D. svc.configd

  ---

  SVC.CONFIGD is the repository daemon responsible for maintaining /etc/svc/repository.db. The repository.db must come clean during this integrity check otherwise it is a "no go" for usual boot sequence to run level 3. The repository may get corrupted due to various hardware issues, software bugs, disk write failures, etc.

  Note: When svc.configd(1M), the Solaris Repository Daemon, is started, it does an integrity check of the smf(5) repository, stored in /etc/svc/repository.db. This integrity check can fail due to a disk failure, the database file being corrupted either due to a hardware bug, a software bug, or an accidental overwrite. If the integrity check fails, svc.configd will write a message to the console.

• Question 220:

  You have been asked to do an orderly shutdown on a process with a PID of 1234, with the kill command.

  Which command is best?

  A. kill -2 1234
  B. kill -15 1234
  C. kill -9 1234
  D. kill -1 1234
  B. kill -15 1234

  ---

  On POSIX-compliant platforms, SIGTERM is the signal sent to a process to request its termination. The symbolic constant for SIGTERM is defined in the header file signal.h. Symbolic signal names are used because signal numbers can vary across platforms, however on the vast majority of systems, SIGTERM is signal #15.

  SIGTERM is the default signal sent to a process by the kill or killall commands. It causes the termination of a process, but unlike the SIGKILL signal, it can be caught and interpreted (or ignored) by the process. Therefore, SIGTERM is akin to asking a process to terminate nicely, allowing cleanup and closure of files. For this reason, on many Unix systems during shutdown, init issues SIGTERM to all processes that are not essential to powering off, waits a few seconds, and then issues SIGKILL to forcibly terminate any such processes that remain.