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Step by Step installing Oracle 10g RAC on VMware
In this guide I’m going to show you the process of creating Oracle 10g R2 RAC on OEL4. First of all I have to mention that I’ve prepared this guide based on the well known RAC on VMWare guide of for...
View ArticlePROT-1: Failed to initialize ocrconfig
Today during RAC installation I got the following error while running root.sh on the first node Setting the permissions on OCR backup directory Setting up NS directories PROT-1: Failed to initialize...
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The installer has detected the existence of Oracle Clusterware
After removing the RAC installation on the test server, I got the following error during the installation: “The installer has detected the existence of 10g Oracle Clusterware on the remote node, —-,...
View ArticleSolving the bug – ORA-07445 [KFKPROCESSREQ()+429] in ASM instance
Today, one of the instances of 2 node RAC went down with ORA-07445 error. After checking metalink, I found out that this is a bug: Bug 10422354: ORA-07445 [KFKPROCESSREQ()+429] [SIGSEGV] ON ASM...
View ArticleTesting Load balancing in Oracle RAC
If you’ve installed Oracle RAC (Real Application Clusters) and want to test how Load Balancing works, you can run the following shell script and check GV$SESSION view: #!/bin/bash ....
View ArticleWaiting at “Performing remote operations” during RAC installation
Today, while installing RAC, the installation began to wait at “Performing remote operations” step. I’ve tried to check log files, but there was no information written Then I tried to trace the...
View ArticleUser equivalence check failed for user “oracle”.
If you’ve installed and configured RAC environment, you should face “User equivalenece check” error during pre-requisite check There’re three common reasons for getting this error: - You didn’t...
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I’m RACAttack Ninja!
I’m proud to announce that I’m one of the 10 RAC Attack Ninjas this year! If you’re attending OOW13, don’t forget to come and say “hi” to Ninjas. We’ll be at OTN Lounge in the lobby of Moscone South on...
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Step by Step Installing Oracle 12c RAC on VirtualBox – Video Tutorial
It’s 3.50 AM at San Francisco and I’m finalizing a new video tutorial that I have been creating for the users who will attend RAC Attack at Oracle Openworld 2013 (Ninja Operation). Tomorrow is the...
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V$ASM_DISKGROUP displays information from the header of ASM disks
While playing with OCR recovery, suddenly I realized that V$ASM_DISKGROUP view gets information from the headers of the ASM disk files that are specified at *.ASM_DISKSTRING parameter. Here’s the...
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Cluster won’t start if diagnostic_dest folder is missing
One of the reason of why cluster won’t start is DIAGNOSTIC_DEST folder is missing. Here it is what I got today in of the nodes of the RAC environment: db-bash: crs_stat -t HA Resource Target State ———–...
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How to troubleshoot CRSCTL REPLACE VOTEDISK error?
It took me some time to investigate why CRSCTL REPLACE VOTEDISK command is not working. [oracle@node1 ~]$ crsctl replace votedisk VDISK CRS-4264: The operation could not be validated CRS-4000: Command...
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Using odd number of disks for Voting disk
As you’ve already known, you should use odd number of disks for voting disk. A node must be able to strictly access more than half of the voting disks at any time. Let me show you how it works. I have...
View ArticleGetting ORA-01105 during RAC db startup
Today, while starting RAC instances of 2 node RAC database (10gR2 on Linux), I got the following error in the first node: ORA-01105: mount is incompatible with mounts by other instances ORA-01677:...
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Struggling with RAC Installation – ORA-15018: diskgroup cannot be created
I said it before. It was only once that I succeeded to install Oracle Clusterware without any issues and that was during OCM exam I didn’t hit any bug, I didn’t re-configured anything. The installation...
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Node names are missing from ./runInstaller output
While installing Oracle Database after Oracle Grid Infrastructure installation, I was supposed to get the list of all nodes where I need to install Oracle Software (11gR2 – 11.2.0.4). But instead, I...
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Default listener “LISTENER” is not configured when running DBCA
When running dbca to create a new database you can get the following message: Default Listener “LISTENER” is not configured in Grid Infrastructure home. Use NetCA to configure Default Listener and...
View ArticleORA-00304: requested INSTANCE_NUMBER is busy
There are a lot of explanation and different solutions for the error “ORA-00304: requested INSTANCE_NUMBER is busy”. But today, in my case while I was tyring to shutdown one of the cluster nodes, it...
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Interim patch apply best practices in Oracle
Yestarday, after successfully applying an interim patch to the 3 node clusterware environment, I decided to share my experience with you. In this blog post, you can find some best practicec that I...
View ArticlePerl related issues when running ./rootcrs.pl to deconfigure the node
Today while deconfiguring one failed node from the clusterware I faced some Perl related issues that blocked me to run ./rootcrs.pl command. After installing few required packages I was able to...
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