In many situation you may like to go through the below link either interviews or knowledge sharing or for any other reasons.
Frequently Asked Questions (RAC FAQ) (Doc ID 220970.1)
RAC – Real Application Clusters
- How do I measure the bandwidth utilization of my NIC or my interconnect?
- How can I validate the scalability of my shared storage? (Tightly related to RAC / Application scalability)
- Is Oracle RAC supported on logical partitions (i.e. LPARs) or other virtualization technologies?
- How should voting disks be implemented in an extended cluster environment?
- What are the cdmp directories in the background_dump_dest used for?
- How do I gather all relevant Oracle and OS log/trace files in an Oracle RAC cluster to provide to Support?
- How should one review the ability to scale out to more nodes in your cluster?
- Can I ignore 10.2 CLUVFY on Solaris warning about failed package existence checks?
- What is a CVU component?
- Why cluvfy reports “unknown” on a particular node?
- What are the requirements for CVU?
- What about discovery? Does CVU discover installed components?
- How do I check Oracle RAC certification?
- Is Veritas Storage Foundation supported with Oracle RAC?
- Can I use ASM as mechanism to mirror the data in an Extended RAC cluster?
- What are the changes in memory requirements from moving from single instance to RAC?
- What are the default values for the command line arguments?
- Do I have to be root to use CVU?
- What is nodelist?
- How do I check minimal system requirements on the nodes?
- How do I get detail output of a check?
- Why the peer comparison with -refnode says passed when the group or user does not exist?
- At what point cluvfy is usable? Can I use cluvfy before installing Oracle Clusterware?
- Is there a way to compare nodes?
- What is a stage?
- How do I know about cluvfy commands? The usage text of cluvfy does not show individual commands.
- Can I check if the storage is shared among the nodes?
- Does Database blocksize or tablespace blocksize affect how the data is passed across the interconnect?
- What is Oracle’s position with respect to supporting RAC on Polyserve CFS?
- How do I check network or node connectivity related issues?
- What is CVU? What are its objectives and features?
- Is there a cluster file system (CFS) Available for Linux?
- Is OCFS2 certified with Oracle RAC 10g?
- How do I check the Oracle Clusterware stack and other sub-components of it?
- Where can I find the CVU trace files?
- Can I use Oracle Clusterware for failover of the SAP Enqueue and VIP services when running SAP in a RAC environment?
- How do I turn on tracing?
- How do I check whether OCFS is properly configured?
- My customer is about to install 10202 clusterwere on new Linux machinges. He is getting “No ORACM running” error when run rootpre.sh and exited? Should he worry about this message?
- Can different releases of Oracle RAC be installed and run on the same physical Linux cluster?
- Oracle Clusterware fails to start after a reboot due to permissions on raw devices reverting to default values. How do I fix this?
- Customer did not load the hangcheck-timer before installing RAC, Can the customer just load the hangcheck-timer ?
- After installing patchset 9013 and patch_2313680 on Linux, the startup was very slow
- Is there a way to verify that the Oracle Clusterware is working properly before proceeding with RAC install?
- How do I configure my RAC Cluster to use the RDS Infiniband?
- Why is validateUserEquiv failing during install (or cluvfy run)?
- What is Runtime Connection Load Balancing?
- How do I enable the load balancing advisory?
- What are the network requirements for an extended RAC cluster?
- What is the maximum distance between nodes in an extended RAC environment?
- Are crossover cables supported as an interconnect with Oracle RAC on any platform?
- What do I do if I see GC CR BLOCK LOST in my top 5 Timed Events in my AWR Report?
- Will adding a new instance to my Oracle RAC database (new node to the cluster) allow me to scale the workload?
- Are Red Hat GFS and GULM certified for DLM?
- How do I configure raw devices in order to install Oracle Clusterware 10g on RHEL5 or OEL5?
- Is Server Side Load Balancing supported/recommended/proven technology in Oracle EBusiness Suite?
- How do I change my Veritas SF RAC installation to use UDP instead of LLT?
- How to reorder or rename logical network interface (NIC) names in Linux
- How does UDP over Infiniband compare to UDP over Gigabit Ethernet when used for the RAC interconnect?
- Is the hangcheck timer still needed with Oracle RAC 10g and 11gR1?
- Can I have different servers in my Oracle RAC? Can they be from different vendors? Can they be of different sizes?
- How many nodes can one have in an HP-UX/Solaris/AIX/Windows/Linux cluster?
- Are 3rd party cluster solutions supported on Linux?
- How many nodes are supported or can be used in an Oracle RAC Database?
- What are my options for setting the Load Balancing Advisory GOAL on a Service?
- Is Oracle Database on VMware support? Is Oracle RAC on VMware supported?
- What is ‘cvuqdisk’ rpm? Why should I install this rpm?
- What is the Load Balancing Advisory?
- A customer installed 10g Release 2 on Linux RH4 Update 2, 2.6.9-22.ELsmp #1 SMP x86_64 GNU/Linux, and got the error Error in invoking target ‘all_no_orcl’. Customer ignored the error and the install succeeded without any other errors and oracle apparently worked fine. What should they do?
- Are Oracle Applications certified with RAC?
- Do I have to type the nodelist every time for the CVU commands? Is there any shortcut?
- How do I check user accounts and administrative permissions related issues?
- How to configure bonding on Suse SLES9.
- How to configure bonding on Suse SLES8.
- How to configure concurrent manager in a RAC environment?
- What is the optimal migration path to be used while migrating the E-Business suite to Oracle RAC?
- Can I use TAF with e-Business in a RAC environment?
- Can I use Automatic Undo Management with Oracle Applications?
- Which e-Business version is prefereable?
- Should functional partitioning be used with Oracle Applications?
- Is the Oracle E-Business Suite (Oracle Applications) certified against RAC?
- I am seeing the wait events ‘ges remote message’, ‘gcs remote message’, and/or ‘gcs for action’. What should I do about these?
RAC
- Do I need to relink the Oracle Clusterware / Grid Infrastructure home after an OS upgrade?
- How can I configure database instances to run on 12.1.0.1 Oracle Flex Cluster Leaf nodes?
- When configuring the NIC cards and switch for a GigE Interconnect should it be set to FULL or Half duplex in Oracle RAC?
- How can a NAS storage vendor certify their storage solution for Oracle RAC ?
- Is Infiniband supported for the Oracle RAC interconnect?
- What kind of HW components do you recommend for the interconnect?
- Where can I find a list of supported solutions to ensure NIC availability / redundancy (for the interconnect) per platform?
- What is Cache Fusion and how does this affect applications?
- Can I run more than one clustered database on a single Oracle RAC cluster?
- What are the restrictions on the SID with an Oracle RAC database? Is it limited to 5 characters?
- Is it supported to install Oracle Clusterware and Oracle RAC as different users?
- Is it difficult to transition (migrate) from Single Instance to Oracle RAC?
- Is rcp and/or rsh required for normal Oracle RAC operation ?
- Does Oracle Clusterware or Oracle Real Application Clusters support heterogeneous platforms?
- What are the dependencies between OCFS and ASM in Oracle Database 10g ?
- Why does the NOAC attribute need to be set on NFS mounted RAC Binaries?
- My customer has an XA Application with a Oracle RAC Database, can I do Load Balancing across the Oracle RAC instances?
- What would you recommend to customer, Oracle Clusterware or Vendor Clusterware (I.E. HP Service Guard, HACMP, Sun Cluster, Veritas etc.) with Oracle Real Application Clusters?
- Do we have to have Oracle Database on all nodes?
- What software is necessary for Oracle RAC? Does it have a separate installation CD to order?
- I have changed my spfile with alter system set parameter_name =…. scope=spfile. The spfile is on ASM storage and the database will not start.
- How to use VLANs for Oracle RAC and the Oracle Clusterware Interconnect?
- What storage is supported with Standard Edition Oracle RAC?
- Can I use Oracle RAC in a distributed transaction processing environment?
- Does changing uid or gid of the Oracle User affect Oracle Clusterware?
- Can I use iSCSI storage with my Oracle RAC cluster?
- Can we designate the place of archive logs on both ASM disk and regular file system, when we use SE RAC?
- Is it a good idea to add anti-virus software to my RAC cluster?
- I want to use rconfig to convert a single instance to Oracle RAC but I am using raw devices in Oracle RAC. Does rconfig support RAW ?
- What combinations of Oracle Clusterware, Oracle RAC and ASM versions can I use?
- I had a 3 node Oracle RAC. One of the nodes had to be completely rebuilt as a result of a problem. As there are no backups, What is the proper procedure to remove the 3rd node from the cluster so it can be added back in?
- Can we output the backupset onto regular file system directly (not onto flash recovery area) using RMAN command, when we use SE RAC?
- How do I check for network problems on my interconect?
- How many NICs do I need to implement Oracle RAC?
- Are there any issues for the interconnect when sharing the same switch as the public network by using VLAN to separate the network?
- I could not get the user equivalence check to work on my Solaris 10 server when trying to install 10.2.0.1 Oracle Clusterware. The install ran fine without issue. << Message: Result: User equivalence check failed for user “oracle”. >>
- Why does netca always creates the listener which listens to public ip and not VIP only?
- Can my customer use Veritas Agents to manage their Oracle RAC database on Unix with SFRAC installed?
- The Veritas installation document on page 219 asks for setting LD_LIBRARY_PATH_64. Should I remove this?
- Can I run Oracle RAC 10g with Oracle RAC 11g?
- Are Sun Logical Domains (ldoms) supported with RAC?
- What Application Design considerations should I be aware of when moving to Oracle RAC?
- Should the SCSI-3 reservation bit be set for our Oracle Clusterware only installation?
- We are using Transparent Data Encryption (TDE). We create a wallet on node 1 and copy to nodes 2 & 3. Open the wallet and we are able to select encrypted data on all three nodes.
Now, we want to REKEY the MASTER KEY. What do we have to do? - I have the 11.2 Grid Infrastructure installed and now I want to install an earlier version of Oracle Database (11.1 or 10.2), is this supported ?
- I get an error with DBCA from 10.2 or 11.1 after I have installed the 11.2 Grid Infrastructure?
- What is Standard Edition Oracle RAC?
- Are jumbo frames supported for the RAC interconnect?
- What is SCAN?
- How do I determine which node in the cluster is the “Master” node?
- Can I have multiple public networks accessing my Oracle RAC?
- Where do I find Oracle Clusterware binaries and ASM binaries with Oracle Database 11g Release 2?
- Can I run Oracle 9i RAC and Oracle RAC 10g in the same cluster?
- If my OCR and Voting Disks are in ASM, can I shutdown the ASM instance?
- Does Oracle support Oracle RAC in Solaris containers (a.k.a. Solaris Zones)?
- Are block devices supported for OCR, Voting Disks, and ASM devices?
- Is there a need to renice LMS processes in Oracle RAC 10g Release 2?
- I get the following error starting my Oracle RAC database, what do I do?
WARNING: No cluster interconnect has been specified.
RAC One Node
- How is Oracle RAC One Node licensed and priced?
- How does RAC One Node compare with traditional cold fail over solutions ?
- If I add or remove nodes from the cluster, how do I inform RAC One Node?
- How do I install the command line tools for RAC One Node?
- How do I get Oracle Real Application Clusters One Node (Oracle RAC One Node)?
- Is Oracle RAC One Node supported with 3rd party clusterware and/or 3rd party CFS?
- If a current customer has an Enterprise License Agreement (ELA), are they entitled to use Oracle RAC One Node?
- Does Enterprise Manager Support RAC One Node?
- How does RAC One Node compare with a single instance Oracle Database protected with Oracle Clusterware?
- How does RAC One Node compare with database DR products like DataGuard or Golden Gate?
- Are we certifying applications specifically for RAC One Node?
- How does RAC One Node compare with virtualization solutions like VMware?
- Does Rac One Node make sense in a stretch cluster environment?
- Where do I find the documentation for RAC One Node?
- Is RAC One Node supported with database versions prior to 11.2?
- What is RAC One Node Omotion?
- Can I use Oracle RAC One Node for Standard Edition Oracle RAC?
- What is Oracle Real Application Clusters One Node (RAC One Node)?
QoS – Quality of Servce Management
- Does QoS Management support admin-managed databases?
- What are the different modes of QoS Management’s operation?
- What is Memory Guard and how does it work?
- Does QoS Management require any specific database deployment?
- Does QoS Management Support Multitenant databases and PDBs?
- What type of applications does Oracle QoS Management manage?
- What QoS Management functionality is in Oracle Enterprise Manager?
- What are Server Pools?
- What methods does QoS Management support for classifying applications and workloads?
- What type of user interfaces does QoS Management support?
- Does QoS Management negatively affect an application’s availability?
- How does QoS Management enable the Private Database Cloud?
- Where can I find documentation for QoS Management?
- What is the overhead of using QoS Management?
- Which type of consolidation does QoS Management support?
- What types of resources does QoS Management manage?
- Is this a product to be used by an IT administrator or DBA?
- What does QoS Management manage?
- What is Oracle’s goal in developing QoS Management?
- What happens should the QoS Management Server fail?
- Which versions of Oracle databases does QoS Management support?
- What types of performance objectives can be set?
- How do I use DBCA in silent mode to set up RAC and ASM?
Clusterware
- Is it supported to rerun root.sh from the Oracle Clusterware installation ?
- Can I configure a firewall (iptables) on the cluster interconnect?
- Can I run the fixup script generated by the 11.2 OUI or CVU on a running system?
- How is the Oracle Cluster Registry (OCR) stored when I use ASM?
- Is it possible to use ASM for the OCR and voting disk?
- Do I need to have user equivalence (ssh, etc…) set up after GRID/RAC is already installed?
- Why does Oracle Clusterware use an additional ‘heartbeat’ via the voting disk, when other cluster software products do not?
- Why does Oracle still use the voting disks when other cluster sofware is present?
- How much I/O activity should the voting disk have?
- I am trying to move my voting disks from one diskgroup to another and getting the error “crsctl replace votedisk – not permitted between ASM Disk Groups.” Why?
- I have a 2 node Oracle RAC cluster, if I pull the interconnect on node 1 to simulate a failure, why does node 2 reboot?
- OCR stored in ASM – What happens, if my ASM instance fails on a node?
- With GNS, do ALL public addresses have to be DHCP managed (public IP, public VIP, public SCAN VIP)?
- Voting Files stored in ASM – How many disks per disk group do I need?
- What happens if I lose my voting disk(s)?
- How should I test the failure of the public network (IE Oracle VIP failover) in my Oracle RAC environment?
- What do I do, I have a corrupt OCR and no valid backup?
- I am installing Oracle Clusterware with a 3rd party vendor clusterware however in the “Specify Cluster Configuration Page” , Oracle Clusterware installer doesn’t show the existing nodes. Why?
- I have a 2-node RAC running. I notice that it is always node2 that is evicted when I test private network failure scenario by disconnecting the private network cable. Doesn’t matter whether it is node1’s or node2’s private network cable that is disconnected, it is always the node2 that is evicted. What happens in a 3-nodes RAC cluster if node1’s cable is disconnected?
- How do I use multiple network interfaces to provide High Availability and/or Load Balancing for my interconnect with Oracle Clusterware?
- What are the licensing rules for Oracle Clusterware? Can I run it without RAC?
- What is Flex Cluster and how can I use it?
- How do I identify the voting file location ?
- Can I use Oracle Clusterware to monitor my EM Agent?
- Does Oracle Clusterware have to be the same or higher release than all instances running on the cluster?
- My customer has noticed tons of log files generated under $CRS_HOME/log//client, is there any way automated way we can setup through Oracle Clusterware to prevent/minimize/remove those aggressively generated files?
- Customer is hitting bug 4462367 with an error message saying low open file descriptor, how do I work around this until the fix is released with the Oracle Clusterware Bundle for 10.2.0.3 or 10.2.0.4 is released?
- What is the voting disk used for?
- I am trying to install Oracle Clusterware (10.2) and when I run the OUI, at the Specify Cluster Configuration screen, the Add, Edit and Remove buttons are grayed out. Nothing comes up in the cluster nodes either. Why?
- Can I use Oracle Clusterware to provide cold failover of my single instance Oracle Databases?
- How do I protect the OCR and Voting in case of media failure?
- How can I register the listener with Oracle Clusterware in RAC 10g Release 2?
- Why is the home for Oracle Clusterware / Oracle Grid Infrastructure not recommended to be a subdirectory of the Oracle base directory?
- In the course of failure testing in an extended RAC environment we find entries in the cssd logfile which indicate actions like ‘diskShortTimeout set to (value)’ and ‘diskLongTimeout set to (value)’.
Can anyone please explain the meaning of these two timeouts in addition to disktimeout? - How do I put my application under the control of Oracle Clusterware to achieve higher availability?
- Is it supported to allow 3rd Party Clusterware to manage Oracle resources (instances, listeners, etc) and turn off Oracle Clusterware management of these?
- Does Oracle Clusterware support application vips?
- Can the Network Interface Card (NIC) device names be different on the nodes in a cluster, for both public and private?
- What is the High Availability API?
- What are the IP requirements for the private interconnect?
- Can I set up failover of the VIP to another card in the same machine or what do I do if I have different network interfaces on different nodes in my cluster (I.E. eth0 on node1,2 and eth1 on node 3,4)?
- How is the voting disk used by Oracle Clusterware?
- When ct run the command ‘onsctl start’ receives the message “Unable to open libhasgen10.so”. Any idea why the message “unable to open libhasgen10.so” ?
- I made a mistake when I created the VIP during the install of Oracle Clusterware, can I change the VIP?
- Does the hostname have to match the public name or can it be anything else?
- Which processes access the OCR ?
- When does the Oracle node VIP fail over to another node and subsequently return to its home node?
- Can I change the name of my cluster after I have created it when I am using Oracle Clusterware?
- What should the permissions be set to for the voting disk and ocr when doing an Oracle RAC Install?
- How do I restore OCR from a backup? On Windows, can I use ocopy?
- With Oracle Clusterware 10g, how do you backup the OCR?
- How to Restore a Lost Voting Disk used by Oracle Clusterware 10g
- Is it a requirement to have the public interface linked to ETH0 or does it only need to be on a ETH lower than the private interface?: – public on ETH1 – private on ETH2
- How to move the OCR location ?
- Can I run a 10.1.0.x database with Oracle Clusterware 10.2 ?
Autonomous Computing
- Is there any example to query mgmtdb directly to get information about performance issues on cluster?
- Is moving the GIMR to a different diskgroup a best practice?
- How to specify the new diskgroup for the MGMTDB during the installation GUI?
- If GIMR is already discovered and managed in EMCC, the recommendation is to remove that from EM Cloud Control Managed Target List?
- If GIMR is not coming up due to some problems, will cluster restart or cluster will not come up till GIMR is up and available as part of CRS restart?
- How to configure interval of data write to mgmtdb?
- What does it mean that the node listener will go away from the current GIMR topology in the upcoming releases?
- How to remove GIMR database if it needs to be replaced?
- Can the data files of GIMR database be placed in any other disk group apart from its default one?
- While using mdbutil.pl with options – add and db, it will recreate the GIMR database. So should the GIMR database be deleted before issuing this command?
- How do I cd into the GIMR’s trace or log directory?
- If EMCC is not supposed to monitor it, why is it discovered as a target ?
- How much shared disk space does the GIMR installation require?
- Does the GIMR get configured in a Oracle Restart single server install?
- Do I need to regularly backup the GIMR?
- Will I lose my GIMR data when upgrading or applying a patch?
- Do I need to separately patch the GIMR?
- Why does the GIMR use hugepages?
- Will I lose my cluster or database availability should the GIMR go down?
- Can I disable the GIMR?
- Who are the clients of GIMR?
- Why was GIMR implemented ?
- What is Grid Infrastructure Management Repository (GIMR) ?