Posts Categorized: Technical Blog
Greg Rahn of Oracle’s real-world performance group posted a technical review of an article I wrote last summer, entitled Making the Most of Oracle Exadata. I have a few comments on the technical concerns Greg raised.
I’m working on a small story about database consolidation and interested to learn what are success and failures that others are going through. While we have our own experience at Pythian, I find it interesting to learn about what others are going through. If you have enough details, it would be nice to see your feedback along these lines…
I’ve seen many a good DBA make the master of starting slaves from the position in the master.info file, most recently this week, that I want to bring it to everyone’s attention.
The scenario goes like this: The instance was in nomount stage and was unable to mount the database. Checked the uptime, and found that the server was rebooted some 5 minutes ago, and the instance tried to come up automatically but failed to mount the database. Checked the alert log and found the following error: ORA-214 signaled during: ALTER DATABASE MOUNT…Made a quick searched about ORA-00214 and it was about mismatched control files. It was probably due to the fact that control files got out of sync as the not-so-graceful reboot of the server was done without first cleanly shutting down the database. This is what doc says:
Today I’ve spent some time (more than this issue was worth, actually) on a client’s system trying to find out why table was not accessible and failed. The error message suggested something went very wrong with .frm file and I already started thinking about restoring the table from backup, when I noticed that accessing any InnoDB table was producing same error. A quick check of the error log showed that when MySQL server was restarted some time ago InnoDB failed to initialize due to a memory issue.
For this blog I have compiled the main information regarding JDBC drivers specifically considering the 11gR2 platform, but the concepts and idea also apply for older platforms as well.
It started out innocently enough: Two node RAC cluster on two Linux RHEL5 with Netapp NFS used as shared filesystem for all shared files. My favorite OS and storage, so I felt confident that clusterware installation will be as smooth as it usually is. I told the customer that this can be done in 3 hours. What I didn’t take into account is that this was my first 11gR2 installation, and that much have changed since 11gR1. As things turned out, it took over 20 hours of my time and a lot of help from colleagues and even former colleagues before we had a successful installation. The time it takes you to read this blog post (and any other on this subject) is likely to be time well spent.
Right now, Galuga has a widget that lists my CPAN distributions. But it’s a boring old static affair that is updated manually. Surely in this age of the Web 2.0, I can do better than that. My first instinct that to go straight for my CPAN author page and extract the information off the HTML
Hey ALL! I just got a very good present from Santa :) I Passed 1Z1-536 Oracle Exadata 11g Essentials and 1Z1-515 Data Warehousing 11g Essentials certification exams. How cool it is if small things like these can make you rejoice like a child :) I am still smiling ….
For last few months I was part of the Pythian’s team helping implement Oracle 11gR2 Clusters for different Oracle customers. All the implementations had different requirements and configurations, however, in all cases, the client’s DBAs made the same mistake over and over again. They used sqlplus and lsnrctl utilities to manage (start/stop) databases and listeners. This is totally wrong in the 11gR2 Cluster world. The following commands are just few examples on how you should start/stop Oracle processes