Investigation on why database doesn’t start after successfully dropping a...
Few months ago, while performing storage migration I faced an interesting issue which could lead to potential downtime if I didn’t notice a hidden warning in the log file. The plan was to create a new...
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Exadata storage cell rolling restart caused datafile and redo log file header...
24 hours passed – still at work. Struggling to start up the database which was corrupted during cell storage rolling restart procedure. And I’ve never seen some Oracle error messages that I saw today....
View ArticleSolution for ORA-27154: post/wait create failed ; ORA-27302: failure occurred...
Today, while creating an empty database in Exadata machine where there was enough free space and memory, we got the following error: SYS@TEST> startup nomount ORA-27154: post/wait create failed...
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Connect to Oracle from Python – write your first Python script!
Python is getting more popular nowadays, because it is reliable and efficient, it has great corporate sponsors, and because of it’s amazing libraries that helps you to save time during the initial...
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Second OCM exam is cleared. New book and online course are on the way
2 months ago after a long preparation I decided to upgrade my OCM certification and registered for the exam in Shanghai. Few years ago when I cleared 10g OCM exam I started my preparations for the...
View ArticlePRCR-1079 : Failed to start resource oranode1-vip. CRS-2680 Clean failed....
Last week we had a clusterware issue on one of the critical 3 node RAC environment. In the first node, network resource is restarted by ending up killing all sessions on that node abnormally. Oracle...
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ODev Yathra Tour 2018 – discovering Incredible India
Last month, after long brainstorm, I decided to take my chance and accepted my participation at Indian Oracle ODev Yathra tour. Despite the fact that I’ve visited India (Hyderabad) 2 times in the past...
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Download and install Oracle Database 18c – NOW!
Most of you already have seen that Oracle Database 18c has been already released. If you haven’t downloaded and installed it yet, let’s do it! First of all, check the following address and download the...
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The most horrific Oracle messages you might get in the production database –...
If you are a production DBA of mission critical system, then you might have already seen the following critical, I would say mortal messages in your alert.log file. When your database was up and...
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How to pass Oracle Database 12c: RAC and Grid Infrastructure Administration...
In this post I will talk about my journey on how to prepare and pass the 12c RAC and Grid Administration exam. About the exam Check the following link to get more information about the exam from...
View ArticleUsing deprecated ASM parameter might prevent your Cluster to start
Few days ago, I was testing some ASM parameters in my 3 nodes 12.2 Clusterware environment and used ASM_PREFERRED_READ_FAILURE_GROUPS parameter to see how I can force ASM to read specific failure...
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OCM Exam Tips and Tricks at www.ocmguide.com
Dear friends Hope most of you already got my book and started preparing for the OCM exam. Every month I get an email from my readers as well as from those who used my book and passed OCM exam...
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[INS-20802] Creating Container Database for Oracle Grid Infrastructure...
After dealing with root.sh script to configure 3 node clusterware environment I succeeded but ended up with the following error when post configuration OUI returned the following error and was unable...
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...
View ArticleGet your weekly OCM exam tip to your email – sign up at www.ocmguide.com
Dear reader. You must have already known about my OCM exam Study Guide that I’ve published few months ago. If not, then get your pdf copy of sample chapters of the book from www.ocmguide.com now. With...
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Step by Step Mastering Oracle Database Cloud Service – DBaaS – in one pdf now!
Hello guys After posting a few articles on DBaaS, I’ve decided to create a single pdf file and collect all my cloud related step by step practical blog posts in it. Click on the following image to...
View ArticlePerforming disaster recovery with RMAN in Oracle Cloud using On-Premises...
In the previous blog posts you have seen how to create a disaster recovery for on-premises Oracle Database by creating a standby database in Oracle Cloud. Sometimes, you might not need to create a...
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Create a Standby database in Oracle Cloud for On-Premises production database
If you have a production database and you plan to build a standby database on the different geographic location, Oracle Cloud is the best option. In this blog post you will see a step by step guide on...
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Configure and practice backup and recovery for Oracle Database in Cloud (DBaaS)
In this post I will show you how to configure backup for Oracle Database in Cloud. First of all, make sure you use Oracle Storage Cloud Service and you set the replication policy. Open the following...
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Create a clone database in Oracle Cloud
In this step by step tutorial, we will create a clone database for the development or testing purposes. Using Oracle Database Cloud service you don’t need to configure and run DUPLICATE command of RMAN...
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