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Q51. The Oracle Grid Infrastructure administrator decides to make more copies of the voting disks that are currently stored in the ASM disk group +VOTE. How can this be done?
A. by running crsctl add css votedisk <path_to_new_voting_disk> to make a copy to a shared location on a shared device or file system
B. by running crsctl add css votedisk +VOTE, thereby adding another copy of the voting disk to the +VOTE disk group
C. by running srvctl replace votedisk +asm_disk_group on another disk group that has greater redundancy, thereby causing additional copies to be created
D. by running crsctl replace votedisk +asm_disk_group on another disk group that has greater redundancy, thereby causing additional copies to be created
Storing Voting Disks on Oracle ASM Using the crsctl replace votedisk command, you can move a given set of voting disks from one Oracle ASM disk group into another, or onto a certified file system. If you move voting disks from one Oracle ASM disk group to another, then you can change the number of voting disks by placing them in a disk group of a different redundancy level as the former disk group. Notes: You cannot directly influence the number of voting disks in one disk group. You cannot use the crsctl add | delete votedisk commands on voting disks stored in Oracle ASM disk groups because Oracle ASM manages the number of voting disks according to the redundancy level of the disk group. You cannot add a voting disk to a cluster file system if the voting disks are stored in an Oracle ASM disk group. Oracle does not support having voting disks in Oracle ASM and directly on a cluster file system for the same cluster at the same time.
Oracle. Clusterware Administration and Deployment Guide 11g Release 2 (11.2)
Q52. A policy-managed RAC database that hosts the ACCOUNTS service has only three instances running rather than the usual four on a six-node cluster.
Five of the six cluster nodes are active and the sixth (RACNODE6) is down for maintenance.
You decide to check the state of the servers in the server pools to see if there are problems with the OLTP pool to which the ACCOUNTS service has been assigned.
You used the crsctl status server-f command and see that the RACNODE3 node has STATE=VISIBLE.
What is true about this situation?
A. The Cluster Synchronization Services Daemon (cssd) is running and RACNODE3 is considered to be part of the cluster, but the Cluster Ready Services Daemon (crsd) is currently not running.
B. Both the Cluster Ready Services Daemon (crsd) and the Cluster Synchronization Service Daemon (cssd) are running on RACNODE3, but RACNODE3 is currently being moved to another server pool.
C. The Cluster Ready Services Daemon (crsd) is running and RACNODE3 is considered to be a part of the cluster, but the Cluster Synchronization Services Daemon (cssd) is currently not running.
D. Neither the Cluster Ready Services Daemon (crsd) nor the Cluster Synchronization Services Daemon (cssd) is running on RACNODE3.
Explanation: Cluster Synchronization Service daemon (CSSD)
An Oracle Clusterware component that discovers and tracks the membership state of each node by providing a common view of membership across the cluster. CSS also monitors process health, specifically the health of the database instance. The Global Enqueue Service Monitor (LMON), a background process that monitors the health of the cluster database environment and registers and de-registers from CSS.
Cluster Ready Services Daemon (CRSD)
The primary Oracle Clusterware process that performs high availability recovery and management operations, such as maintaining OCR. Also manages application resources and runs as root user (or by a user in the admin group on Mac OS X-based systems) and restarts automatically upon failure
Servers that have Oracle Clusterware running, but not the Cluster Ready Services daemon (crsd), are put into the VISIBLE state. This usually indicates an intermittent issue or failure and Oracle Clusterware trying to recover (restart) the daemon. Oracle Clusterware cannot manage resources on servers while the servers are in this state.
Oracle Clusterware Administration and Deployment Guide
Q53. You want to check an ACFS for consistency on the Linux platform. Which command-line tool would you use to do this?
Dismounting an Oracle ACFS File System You can dismount a file system without deregistering the file system or disabling the volume on which the file system is mounted. For example, you can dismount a file system and run fsck to check the file system. # /bin/umount /u01/app/acfsmounts/myacfs # /sbin/fsck -a -v -y -t acfs /dev/asm/volume1-123 After you dismount a file system, you must explicitly mount the file system.
1. Use umount on Linux systems or acfsdismount on Windows systems. For information about the commands to dismount a file system, see "umount" or "acfsdismount".
2. Use fsck on Linux systems or acfschkdsk on Windows systems to check a file system. For information about the commands to check a file system, see "fsck" or "acfschkdsk".
Oracle. Automatic Storage Management Administrator's Guide 11g Release 2 (11.2)
Q54. You installed the Oracle Grid Infrastructure on a four-node cluster before discussing the network requirements with the network administrator who was on holiday.
You created a single scan named mydb-scan.myclust.example.com by adding this name to the /etc/hosts file. As a result, the Grid Infrastructure has four node listeners and node VIP but only a single SCAN listener and SCAN VIP.
The network administrator has returned and modified the corporate DNS server to associate three IP addresses with the mydb-scan.myclust.example.com scan name. The SCAN VIPs are on the same network as the node VIPs.
You now must replace the single SCAN VIP and listener with three of each for high availability purposes and make certain that the SCANs and listeners are active. Which procedure will do this properly if run as the root user?
A. srvctl stop scan_listener srvctl stop scan srvctl start scan srvctl start scan_listener
B. srvctl stop scan_listener srvctl stop scan srvctl remove scan srvctl add scan -n MYDB-SCAN.MYCLUST.EXAMPLE.COM srvctl start scan srvctl start scan_listener
C. srvctl add scan -n MYDB-SCAN.MYCLUST.EXAMPLE.COM srvctl start scan srvctl start scan_listener
D. srvctl stop scan_listener srvctl stop scan srvctl remove scan srvctl add scan srvctl start scan srvctl start scan listener
How to update the IP address of the SCAN VIP resources (ora.scan.vip) [ID 952903.1]
Modified 03-JAN-2012 Type HOWTO Status PUBLISHED
In this Document
Oracle Server - Enterprise Edition - Version: 184.108.40.206 to 220.127.116.11 - Release: 11.2 to 11.2
Information in this document applies to any platform.
The purpose of this document is to explain how to change the IP addresses associated with the SCAN VIPs in a 11gR2 Grid (CRS) environment.
The IP addresses associated with the SCAN VIP resources are initially set when the SCAN resources are created.
Any changes to the DNS entry for the SCAN are not automatically propagated to the clusterware and need to be done manually.
This applies only to installations that are not using GNS.
The information in this note can also be helpful in cases where SCAN was originally configured with just one address and is now being expanded to accommodate three IP addresses.
Before the SCAN VIPs can be changed, the entry for the SCAN name on the Domain
Name Server (DNS) needs to be updated with the new IP addresses. This usually will be done by a network administrator. To check the current setting, the following command can be used:
To check the current IP address(es) of the SCAN VIPs, run the following commands as the root user:
$GRID_HOME/bin/srvctl config scan
Next refresh the SCAN VIPs with the new IP addresses from the DNS entry:
$GRID_HOME/bin/srvctl modify scan -n <scan_name>
To check if the SCAN VIPs have been changed, run the following command, it should now show the new IP addresses.
$GRID_HOME/bin/srvctl config scan
Below is an example using the following configuration:
The name of the SCAN is sales-scan.example.com
subnet of the public network is 10.100.10.0
netmask for the public network is 255.255.255.0
name of the public interface is eth1
old IP addresses: 10.100.10.81, 10.100.10.82 & 10.100.10.83
new IP addresses: 10.100.10.121, 10.100.10.122 & 10.100.10.123
A lookup of the SCAN on the DNS server shows that the entry has already been updated
with the new IP addresses:
$ nslookup sales-scan.example.com Server: dns1.example.com Address: 10.100.10.70#53 Name: sales-scan.example.com Address: 10.100.10.123 Name: sales-scan.example.com Address: 10.100.10.122 Name: sales-scan.example.com Address: 10.100.10.121
Stop the SCAN listener and the SCAN VIP resources: # $GRID_HOME/bin/srvctl stop scan_listener # $GRID_HOME/bin/srvctl stop scan # $GRID_HOME/bin/srvctl status scan SCAN VIP scan1 is enabled SCAN VIP scan1 is not running SCAN VIP scan2 is enabled SCAN VIP scan2 is not running SCAN VIP scan3 is enabled SCAN VIP scan3 is not running # $GRID_HOME/bin/srvctl status scan_listener SCAN Listener LISTENER_SCAN1 is enabled SCAN listener LISTENER_SCAN1 is not running SCAN Listener LISTENER_SCAN2 is enabled SCAN listener LISTENER_SCAN2 is not running SCAN Listener LISTENER_SCAN3 is enabled SCAN listener LISTENER_SCAN3 is not running
The SCAN VIP resources still show the old IP addresses: # $GRID_HOME/bin/srvctl config scan SCAN name: sales-scan, Network: 1/10.100.10.0/255.255.255.0/eth1 SCAN VIP name: scan1, IP: /sales-scan.example.com/10.100.10.81 SCAN VIP name: scan2, IP: /sales-scan.example.com/10.100.10.82 SCAN VIP name: scan3, IP: /sales-scan.example.com/10.100.10.83
Now tell CRS to update the SCAN VIP resources: # $GRID_HOME/bin/srvctl modify scan -n sales-scan.example.com
To verify that the change was successful, check the SCAN configuration again: # $GRID_HOME/bin/srvctl config scan SCAN name: sales-scan, Network: 1/10.100.10.0/255.255.255.0/eth1 SCAN VIP name: scan1, IP: /sales-scan.example.com/10.100.10.121 SCAN VIP name: scan2, IP: /sales-scan.example.com/10.100.10.122 SCAN VIP name: scan3, IP: /sales-scan.example.com/10.100.10.123
Start SCAN and the SCAN listener: # $GRID_HOME/bin/srvctl start scan # $GRID_HOME/bin/srvctl start scan_listener
Please note that if the SCAN VIPs are being changed because of a change of the subnet of the public network additional changes may be required , e.g. the node VIPs and the network resource (ora.net1.network). For more information please refer to Document 276434.1 and the 11.2 documentation. My Oracle Support
Q55. You are managing a policy-managed three-instance RAC database. You ran database ADDM for the database and noticed gc current block congested and gc cr block congested waits. What are two possible reasons for these wait events?
A. The wait events indicate a delay in processing has occurred in the Global Cache Services (GCS), which is usually caused by high load.
B. The wait times indicate that the blocks must wait after initiating a gc block request, for the round trip from the start of the wait until the blocks arrive.
C. The wait events indicate that there is block contention resulting in multiple requests for access to local blocks.
D. The wait events indicate that the local instance making the request for current or consistent read blocks was waiting for logical I/O from its own buffer cache at the same time.
Explanation: Load-Related Wait Events
The main wait events for load-related waits are:
. gc current block congested
. gc cr block congested The load-related wait events indicate that a delay in processing has occurred in the GCS, which is usually caused by high load, CPU saturation and would have to be solved by additional CPUs, load-balancing, off loading processing to different times or a new cluster node. For the events mentioned, the wait time encompasses the entire round trip from the time a session starts to wait after initiating a block request until the block arrives Oracle Real Application Clusters Administration and Deployment Guide
Q56. In the high availability services' provided by Oracle Clusterware are used to protect Oracle resource such as RAC database instances, RAC database services, and other components of the Oracle Infrastructure, and non-Oracle resources as well.
Which two statements are true about the high availability capabilities of Oracle HA services?
A. RAC databases may have their instances failed over in some cases.
B. ASM instances may be failed over if fewer than three nodes remain In the cluster, so that there are always at least three ASM instances available.
C. If a node fails, then all resources that were active on that node will be failed over to a surviving node if any exists.
D. If a node fails, then cluster resources that were active on that node may be failed over to a surviving node if any exists, but local resources are not failed over.
E. HA services will only fail over a resource upon failure of the node where the resource was active.
Q57. Identify the three valid storage options for Grid Infrastructure voting disk and Install.
A. a certified Cluster File System (CFS)
B. a certified Network File System (NFS)
C. ASM Cluster File System (ACFS)
D. Automatic Storage Management (ASM)
E. shared disk slices (block or raw devices)
Oracle 11g: RAC and Grid Infrastructure Administration Accelerated 2 - 4
Q58. Which three statements are true about Clusterware resource debugging?
A. The crsctl command can be used to set debugging for Clusterware resources by using the following syntax:
crsctl set log resource "resource_name:logging_level".
B. Enabling logging for Clusterware resources can negatively affect cluster performance, so it should be used only when required.
C. After collecting debugging data for a specific Clusterware resource, terminate the collection of debugging data by issuing the crsctl set log resource "resource_name:stop" command.
D. Although the crsctl command can be used to dynamically affect logging for Clusterware resources, you can also configure resource debugging automatically by specifying a logging_ievel clause in the Grid_Home/log/hostname/admin/clscfg.ini file.
E. Debugging cannot be set for user-defined resources.
Answer: A,B,D Explanation:
Enabling Resource Debugging
Change the USR_ORA_DEBUG resource attribute to 1 for specific resources:
# crsctl set log res "ora.host01.vip:1"
After you capture all trace information, change the debug attribute back to 0:
# crsctl set log res "ora.host01.vip:0"
You can use an initialization file to configure debugging.
The initialization file name includes the name of the process that you are debugging (process_name.ini).
The file is located in the <Grid_Home>/log/host_name/admin/ directory.
Oracle Support may request that you enable tracing to capture additional information for problem resolution with Oracle Clusterware resources. Because the procedures described here may affect performance, perform these activities only with the assistance of Oracle Support.
The initialization file name includes the name of the process that you are debugging
(process_name.ini). The file is located in the <Grid_Home>/log/host_name/admin/ directory. For example, the name for the CLSCFG debugging initialization file on node1 would be: <Grid_Home>/log/node1/admin/clscfg.ini
Oracle 11g: RAC and Grid Infrastructure Administration Accelerated 6 - 13
Q59. You plan to remove a node called RACNODE4 from a four-node cluster.
The cluster is running Oracle Grid Infrastructure 11g Release 2 and there is also a database home with cluster databases running Oracle Database version 11g Release 1. This older home supports different applications that have not been certified to run on the latest release.
The cluster databases for Oracle Database 11g Release 1 each had four Instances at one time, but currently only the first two nodes, RACNODE1 and RACNODE2, are running instances of those databases.
Which two additional steps are required when deleting a node from a cluster in this situation?
A. Run crsctl pin css -n RACNODE1, RACNODE2 as root if the nodes are unpinned.
B. Run crsctl pin css -n RACNODE4 as the Grid Infrastructure owner if RACNODE4 is unpinned.
C. Run olsnodes -t -n to list all cluster nodes that are pinned.
D. Run crsctl unpin css - RACNODE4 as the Grid Infrastructure owner if RACNODE4 is pinned.
E. Run crsctl unpin css - RACNODE4 as root if RACNODE 4 is pinned.
F. Run crsctl nodelist -t -n to list all cluster nodes that are pinned.
Deleting a Cluster Node on Linux and UNIX Systems
1. Ensure that Grid_home correctly specifies the full directory path for the Oracle
Clusterware home on each node, where Grid_home is the location of the installed Oracle Clusterware software.
2. Run the following command as either root or the user that installed Oracle Clusterware to determine whether the node you want to delete is active and whether it is pinned: $ olsnodes -s -t If the node is pinned, then run the crsctl unpin css command. Otherwise, proceed to the next step. Oracle. Clusterware Administration and Deployment Guide 11g Release 2 (11.2)
Q60. The Oracle Grid Infrastructure administrator wants to perform daily checks on the integrity of the Clusterware files. Which three steps can be performed to determine the health of the OCR files and voting disks?
A. Run ocrcheck to verify the health of the OCR file only from the master node, which performs all input/output (I/O) operations on the OCR.
B. Run grep voting <grid_home>/log/<hostname>/cssd/ocssd.log from any cluster node.
C. Run cluvfy comp ocr -n all from any cluster node.
D. Run ocrcheck to verify the health of the OCR file from any cluster node.
E. Run votecheck to verify the health of the voting disk from any cluster node.
Checking the Integrity of Oracle Clusterware Configuration Files The following techniques are used to validate the integrity of Oracle Cluster configuration files. Check the ocssd.log for voting disks issues. $ grep voting <grid_home>/log/<hostname>/cssd/ocssd.log Use the cluvfy utility or the ocrcheck command to check the integrity of the OCR. $ cluvfy comp ocr –n all -verbose $ ocrcheck
D60488GC11 Oracle 11g: RAC and Grid Infrastructure Administration