On linux yum is very useful to install package on operating system.

You may hit this error while try to use yum. So here is the solutions steps but first let us see exact error message:

[root@veridata yum.repos.d]# yum install httpd
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 – “Could not resolve host: mirrorlist.centos.org; Unknown error”

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I face with that error while try to set SQL Plan on one of my sql.

This is the one of he published bug.

Bug 10313110  SQL Advisor raises an ORA-13786 when Trying to Implement a Recommended Parallel Profile

If I try to use below syntax its also through error message such as:

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The “rescan-scsi-bus.sh” can be used to scan new LUNs in a CentOS/RHEL machine.

When ‘rescan-scsi-bus.sh -i’ is run, script execute as well a LIP_RESET (ISSUE_LIP) which may cause a disruption in I/O on the server and even cause an outage in case of a system running on heavy load.

Redhat says this type of scan can be distributive,since it can cause delays while I/O operation timeout and remove devices unexpectedly from OS.

So perform this scan when really you want to scan the disks and LUNS.

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In this post I want to share my pdf file which covers step by step Disk preparation for Grid Installation on VMware Workstation

You may need to add and format related disks for ASM setup

Please click download button to can download step by step document.

I was hit that missing package messahe while installing Grid Infrastructure software on standalone installation. You may face an error on prerequest check steps which says that package cvuqdisk is required to be installed before Grid Infrastructure installation.

You have 2 options in that steps

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I was try to re-configuring a cluster in the Cloud Control and in one of the steps is to configure access to the ASM part.

For This part is used by the asmsnmp user, which is the one that must be configured. I did not know the password of this user.

So I need to change it with new one.

To make this, We have two options. Those option can be use Oracle 12c to 20c.

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In this post We will see how to check CRS related info and also how to stop/start RAC components.

Here is the my system details:

My db version : 11.2.0.4
My Operating System : Linux 7
My servers hostname : node1-node2
My database name : ORCL01
My instance name : ORCL011-ORCL012

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In this post, I want to share Switchover process on Dataguard Setup.

Primary Db version is 12c( 2 node RAC)
Standby db is standalone

Operation system is Linux

Here is the steps:

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I face with this error while making 2 node RAC installation on AIX. My Db version is 11.2.0.4.
I can run root.sh on node 1 without any issue. But on node 2 root.sh shows this message:

Adding Clusterware entries to inittab
CRS-4402: The CSS daemon was started in exclusive mode but found an active CSS daemon on node Node1, number 1, and is terminating
An active cluster was found during exclusive start-up, restarting to join the cluster
Configure Oracle Grid Infrastructure for a Cluster … succeeded

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I faced with that error during Oracle 11.2.0.4 software installation on 19c Grid software installation on linux 7. Complete error message is:

Database Clusterware Version Compatibility – This test ensures that the Database version is compatible with the CRS version.  Error:
 – 
PRVF-4037 : CRS is not installed on any of the nodes  – Cause:  Could not identify a CRS installation on any node.  – Action:  Ensure that CRS is installed on all the nodes participating in the operation.

Operation Failed on Nodes: [node2  node1]
Verification result of failed node: node2

So how I can handle this? Its simple, run installer command as below

runInstaller -ignorePrereq