Posts by Yury Velikanov
Just received a page about “Corrupt block”. From the first look it kind of scary to receive such page 40 minutes before your shift ends. Right?
After examining an alert.log (see below) and looking through knowledge bases found an explanation that it isn’t as bad as I thought. I liked the explanation I found therefore I decided to share it with rest of the world. Here you go folks
In this blog post I am publishing my SLOB tests results and conclusions testing Oracle database IO performance placing data files on NFS directly and on ASM disk group located on NFS.
My tweet few days ago – “Personally I don’t see the point building ASM on (d)NFS. ASM suppose to exclude unnecessary layers. In NAS case it adds an additional layer.” Since then Oracle people in my Social Media environment helped me to find several legitimate reasons to run ASM on NAS. Thank you folks very much. Now I am sharing our common thoughts with the rest of the community.
There is a very strong Oracle Community in Perth, Australia. I admire many Perth based Oracle User Group volunteers who year from your organizing a great Oracle event. This year it isn’t an exception. I just spent 30 minutes going through the program and I should say the lineup of speakers is very impressive. Here’s the schedule.
While Oracle tech folks doing their best to explain meaning of not so many DNFS configuration file (oranfstab) parameters I still find an official description a bit confusing. Therefore I decided to share my understanding of the DNFS configuration parameters in hope that it will help someone or if my understanding is wrong someone corrects me :) So, if I am wrong please please please feel free to leave comments.
This is one of those posts that you find via google using an error message for direct hit search. If you didn’t reach this post that way I would advise you to stop reading here. If you are still reading then you (as I did) faced error messages below and got frustrated as it isn’t obvious what exactly Oracle means by wtmax/fsinfo/rt/rtp/wt/wtp etc. It all has been very confusing to me as I am Oracle DBA and still need to learn a lot on system administration level side of things.
Recently I have troubleshooted a failing RMAN backups in 184.108.40.206 RAC environment. The backups failed with an error message “ORA-00245: control file backup operation failed”. The solution for the issue is simple. Here it is.
Friday 13 of June 2012 I was oncall Oracle DBA. I got to work on a high priority client’s request. A financial team of one of my team’s clients was executing final steps of a year closing process in their ERP production environment and had a problem.The step that I received a complain about took 2 hours and still didn’t complete. I was told that last year the same step completed in 20 minutes. Looking back I think it may be beneficial for someone of you to read how the issue has been troubleshooted and resolved. It may give you a chance to learn something or share some better diagnosing techniques with me and others. Please do not hesitate to use comments section of this blog post.
As a third person just asked me how to prepare for OCM exam in the last 2 days, I decided to make my answer publically available. I will leave you to discover the formal path yourself and give you a guideline in terms of how and how long to prepare to the exam.
This process can be used for most 11G upgrade projects. Very often a hardware got updated at the same time as a database version. In such case we migrate a database from an original location to a new server upgrading database version and sometimes changing operational system. If this is your scenario then you can use the upgrade process to minimize system’s downtime to 1 hour independently from size of the database you migrate.