Tag: Oracle

RMAN: Corrupt Block? Let’s Re-Read… Nope, It’s All Good

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

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Are There Performance Penalties Running Oracle ASM on NFS?

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.

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Pythian at Oracle with 20:20 Foresight Perth Australia

Perth is far from everywhere, but not far from the Oracle technologies. Passion, knowledge, and urge to share the experience, skills, tips and knowledge brought people from across the planet to gather under one roof and learn, educate and network under the banner of Oracle with 20:20 Foresight.

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Select Statement Generating Redo and Other Mysteries of Exadata

Like many good stories, this one also started with an innocent question from customer: “I often check “SELECT COUNT(*) FROM TABLE;” on our old 10.2.0.4 cluster and the new Exadata. The Exadata is slower than our old cluster by few minutes. Exadata is not good at count(*) ? or other problem?” Here’s how I fixed it.

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Reasons to Use ASM 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.

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My Agenda for AUSOUG Conference in Perth

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.

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Oracle Direct NFS Configuration File Explained

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.

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Log Buffer #292, A Carnival of the Vanities for DBAs

This Log Buffer Edition is once again here, packed with rocking and rolling blogs from the database world. Log Buffer#292 comprises of select few posts from Oracle, MySQL and the SQL Server. Enjoy.

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Oracle E-Business Suite News from OpenWorld 2012

I always followed all Oracle OpenWorld happenings through blogs, but this is the first OpenWorld that I physically attended. The blog post from Michael Abbey on tips for OOW first timers was a godsend for me. This helped me to navigate OOW like a pro. This is what I checked out..

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DNFS: wtmax = /proc/fs/nfsd/max_block_size

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.

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