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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...
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www.OracleVideoTutorials.com
Just came across a wonderful blog where you can find dozens of different Oracle related video tutorials www.OracleVideoTutorials.com
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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My LAD Tour 2014 impressions
After returning home from LAD Tour, I would like to share some of my experience on my first ever trip to Argentina and Uruguay. First of all, it was a very long journey It took me 26 hours to get to...
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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...
View ArticleBeware default tablespace during Data Pump import
Today, while importing one database to another, my colleague (Turkel) got a tablespace issue despite the fact that he used REMAP_TABLESPACE for almost all available tablespaces of the source database....
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IOError: [Errno 30] Read only file system
While installing OEL on VirtualBox I got the following error: After a little research I solved the problem by chaning IDE for CDROM from “IDE Slave Master” to “IDE...
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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...
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Wrong parallelism degree for the heavy SQL commands
Yesterday I got a call from the Datawarehouse team member who claimed that some reports started to run slowly. Hmm … Slowly … Right after I got a call, I checked the session and found that it was...
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...
View ArticleORA-02298: cannot enable name – parent keys not found
An interesting case we just got while migrating a data to the different database where we got the following error: ORA-39083: Object type REF_CONSTRAINT failed to create with error: ORA-02298: cannot...
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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...
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Oracle 11g Clusterware failure scenarios with practical demonstrations – Webinar
Sharing my Webinar on “Oracle 11g Clusterware failure scenarios with practical demonstrations” which I did for RACSIG few days ago
View ArticleRMAN “Catalog start with” returns “no files found to be unknown to the database”
Interesting issue happened today (running 11.2.0.3 DB on Linux) while using “CATALOG START WITH” command in RMAN. Although I was having all backups under /orabackup folder, RMAN didn’t find anything,...
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“Oracle Certified Master 11g Study Guide” – www.ocmguide.com – Free Ebook
This is it! My second book is out! There are bunch of certified associate and professional Oracle DBAs around the world who plan to take an OCM exam, but without having a study guide it seems to be...
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Step by step guide to create an Oracle Database in the Cloud
In this blog post I will share the steps to create an Oracle Database in Cloud. We will create a database service, create a second database in the same machine in a silent mode, access to the cloud...
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Step by step guide – create a primary and standby database in the Cloud!
In this guide, I will show you how to create a primary and standby database in the cloud. Login to your cloud account, switch to the Oracle Database Cloud Service page and create a new service. Select...
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