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Oracle Real Application Clusters 11g Essentials

Question No: 11

Which is not a node app?

  1. ASM

  2. ONS

  3. GSD

  4. VIP

Answer: A Explanation: Note:

  • srvctl modify nodeapps Options

  • OptionDescription

    -n node_name Node name.

    -o clusterware_home

    Oracle Clusterware home for node applications such as VIP, ONS, and GSD.

    -A new_vip_address

    The node level VIP address (name|ip/netmask[/if1[|if2|…]]).

    * srvctl config nodeapps Option OptionDescription

    -n node_name Node name.


    Displays the VIP address configuration.


    Displays the GSD configuration.


    Displays the ONS configuration.


    Displays the listener configuration.

    Reference: Oracle Real Application Clusters Administration and Deployment Guide, A Server Control Utility Reference

    Question No: 12

    You are creating a RAC database with DBCA. Which of these is NOT a main area of initialization parameters you can configure as part of the process?

    1. Memory

    2. page size

    3. Character set

    4. Connection mode

      Answer: B

      Explanation: The Initialization Parameters page appears. By default, the Initialization Parameters page shows only the basic parameters, and only enables you to change the parameter file definition if you are using raw storage. Each tab on the Initialization Parameters page provides different sets of information that you can add or modify as follows:

      1. Memory Tab.

        ->Sizing Tab: Use this page to select the database standard block size and process count.

        ->Character Sets Tab: Use this page to set the database character set value.

        ->Connection Mode Tab: You can use this tab to select either dedicated or shared database connections to your database.

        ->Parameter File Tab: This tab will only appear if you are using raw storage. Use this tab to enter a raw device name for the location of the server parameter file.

        Reference: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Installation Guide 10g Release 2 (10.2) for Microsoft Window, Creating an Oracle Real Application Clusters Database with DBCA

        Question No: 13

        Which tool can be used to specify network interfaces and to retrieve component configuration information?

        1. CVU

        2. SRVCTL

        3. CRSCTL

        4. OIFCFG

    Answer: D

    Explanation: The Oracle Interface Configuration (OIFCFG) command-line interface helps you to define and administer network interfaces. You can issue OIFCFG commands in single-instance and Oracle Clusterware environments to:

    Allocate and deallocate network interfaces to components Direct components to use specific network interfaces Retrieve component configuration information

    Reference: Oracle Interface Configuration (OIFCFG) Command Reference

    Question No: 14

    You want to set full debugging for the communications and resource management components for the CRS module on nodes host01 and host03. How can you accomplish this?

    1. crsctl set log CRS “CRSCTL: 5, CRSCOMM: 5” -nodelist host01, host03

    2. crsctl lsmodules crs set log CRSCTL: 5, CRSCOMM: 5 -nodelist host01, host03

    3. srvctl set log -m CRSCTL5, CRSCOMM 5 -n host01, host03

    4. ocrconfig set log CRS “CRSCTL, CRSCOMM: 5” -nodelist host 01, host03

    Answer: A

    Explanation: To set log levels for the CRSRTI and CRSCOMM components of the CRS module:

    $ crsctl set log crs quot;CRSRTI=1,CRSCOMM=2quot;

    Reference: Oracle Clusterware Administration and Deployment Guide, CRSCTL Utility Reference

    Question No: 15

    What would be the total space required for Clusterware files when stopping them in the ASM Diskgroup configured with NORMAL redundancy? (Assume each OCR and voting Disk files uses 300 MB.)

    1. 1.5 GB

    2. 2.4 GB

    3. 600 MB

    4. 900 MB

    Answer: A

    Explanation: When you use normal redundancy, Oracle Clusterware automatically maintains two copies of the OCR file and three copies of the voting disk file.

    Reference: About Oracle Clusterware

    Question No: 16

    Which OCRCONFIG command backs up the OCR to the -backuploc location?

    1. -overwrite

    2. -backuploc pathname

    3. -manualbackup

    4. -export

    Answer: C

    Explanation: ocrconfig -manualbackup

    Use the ocrconfig -manualbackup command to back up OCR on demand in the location you specify with the -backuploc option.


    Not C: This command just defines the backuploc location. ocrconfig -backuploc

    Use the ocrconfig -backuploc command to specify an OCR backup directory location.


    ocrconfig [-local] -backuploc file_name Example

    To specify an OCR backup location in a directory:

    # ocrconfig -backuploc $Grid_home/cdata/cluster3 Reference: Oracle Cluster Registry Utility Reference

    Question No: 17

    Which two statements about the Single Client Access Name (SCAN) feature are correct?

    1. In typical Grid Infrastructure Installation, the SCAN name defaults to the cluster name

    2. A SCAN listener runs on every cluster node

    3. SCAN is available with any version of Oracle 11g RAC

    4. SCAN provides location Independence of Oracle RAC databases in the cluster

    Answer: A,B

    Explanation: SCAN components in a cluster:

    ->SCAN Name

    ->SCAN IP, Oracle recommends 3 IP addresses for SCAN for a cluster

    ->SCAN Listener

    SCAN Name will represent the cluster in the network. SCAN Name needs to be registered in DNS and resolved using round-robin algorithm. To test the round-robin algorithm, perform nslookup on the SCAN Name. The DNS server should return those 3 set of IP Address in different order each time


    Not C: Only from R2:

    Prior to Oracle 11g R1 RAC, client connection to RAC Cluster will use each node VIP (virtual IP) address. So each time a node is added to the cluster, the client tnsnames.ora file needs to be updated with the new VIP addition.

    Oracle 11g R2 RAC introduces SCAN (Single Client Access Name) to handle that problem. SCAN provides single name from clients to access the database running in the cluster.

    Question No: 18

    How many Oracle Clusterware interconnect networks are required and why?

    1. Only one; minimum requirement

    2. Two; redundancy is required

    3. One per node in the cluster

    4. One per database in the cluster

    Answer: C

    Explanation: Oracle Clusterware requires a cluster interconnect configured for inter-node communication.


    • The Oracle Clusterware interconnect is a non-traditional interconnect and should be considered, in shared global cache applications, such as Oracle RAC, to be an I/O subsystem for inter-node global cache buffer transfers with the latency and bandwidth requirements of high performance cluster computing.

    • The interconnect network is a private network using a switch (or multiple switches) that only the nodes in the cluster can access.


      Oracle Clusterware requires that you connect the nodes in the cluster to a private network by way

      of a private interconnect. The private interconnect is a separate network that you configure between cluster nodes. The interconnect used by Oracle RAC is the same interconnect that Oracle Clusterware uses. This interconnect should be a private interconnect, meaning it is not accessible to nodes that are not members of the cluster.

      Reference: Oracle Real Application Clusters (RAC) and Oracle Clusterware Interconnect Virtual Local Area Networks (VLANs) Deployment Considerations

      Question No: 19

      Which command line tool can be used for working with the Oracle cluster Registry?

      1. SRVCTL

      2. OCRCFG

      3. OCRCONFIG

      4. CRSCTL

      5. OEM

      6. OUI

      Answer: C

      Reference: Oracle Cluster Registry Utility Reference

      Question No: 20

      How do you modify Kernel Parameters to meet the minimum requirements for Oracle RAC? (Select all that Apply)

      1. Pre-Oracle RAC 11g Release 2 manually changing the kernel Parameters is required to meet Oracle RAC minimum requirements.

      2. With Oracle Grid Infrastructure / Oracle RAC 11g Release 2 fixup-scripts (CVU generated) can be used to set the appropriate kernel Parameters.

      3. The Oracle Enterprise Manager can be used to modify kernel Parameters before the Installation of the Oracle RAC stack.

      4. You do not need to change any Kernel Parameters for an Oracle RAC installation.

      Answer: A,B

      Explanation: A: In Pre-Oracle RAC 11g Release 2 we did manually changed the kernel Parameters to meet Oracle RAC minimum requirements

      B: With Oracle Clusterware 11g release 2, Oracle Universal Installer (OUI) detects when the minimum requirements for an installation are not met, and creates shell scripts, called fixup scripts, to finish incomplete system configuration steps. If OUI detects an incomplete task, then it generates fixup scripts (runfixup.sh). You can run the fixup script after you click the Fix and Check Again Button.

      You also can have CVU generate fixup scripts before installation. Reference: Installation Fixup Scripts

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