Tag: DBA Lounge

Oracle Support Case Studies

As I was poking around metalink, I found the following extremely interesting section. It’s in a very obvious place, but it’s new, so many of you may have not noticed it. It’s called “Support case studies” and provides some amazing articles.

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Oracle Patch 10.2.0.3 – Bugs We’ve Seen

When I read Note: 391116.1 with the full list, I noticed the following bugs that we’ve encountered are fixed. Unfortunately, an important bug in 10.2.0.2 posted on the Sept. 29 is not listed as fixed in this patch list.

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Diagnosing Oracle Performance Problems on *nix

One day I came up with the following neat idea. Start a second listener, on a different port, calling it the emergency listener. Then renice the listener process with higher priority. Now, every time I connect to the database via my emergency listener, my connection gets higher priority, and thus feels like there’s no problem with the database’s resource use.

There is one little caveat however. You need to either have access to root, or have a nice SA that will add renice to your sudoers file .

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The Answer to Free Memory, Swap, Oracle and Everything

I have submitted an abstract for my new presentation about linux/unix memory and Oracle to the Rocky Mountain Oracle Users Group for the Training Days in Denver on February 14-15, 2007. I pilot tested it at the Ottawa Oracle User Group in June. The feedback was good and since then I have kept developing the presentation. Soon to be submitted for HotSos 2007.

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Oracle block corruptions, DBV vs RMAN

Over-the-Top Tales from the Trenches: Bringing order to the chaos of every day DBA life.

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Using Data as a Tool

IT programs only teach you the programming and software architecture perspective. In DBA work, even when scripting, you have to consider the data as a tool. I’ll show you what I mean.

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Recipes for Creating a Managed Standby with RMAN

Over-the-Top Tales from the Trenches: Bringing order to the chaos of every-day DBA life.

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Oracle 10.2.0.3 coming soon, and a data guard corruption bug

It looks like Oracle has started testing the 10.2.0.3 patchset. A preliminary list of bugs fixed is at in MetaLink note 391116.1. The “important” bug fixes are here.

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Basic I/O Monitoring on Linux

Indeed, while the technique we discuss here is basic, it gives a good overview and is very easy to use. So let get focused… We will use iostat utility. There is much to say about IO monitoring and interpreting results. Perhaps this is only the first of a series of posts about IO statistics. At Pythian we often come across different environments with specific characteristics and various requirements that our clients have. So stay tune — more to come.

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LOBs Can Break Your Standby

Typically, we monitor the v$datafile to ensure there are no NOLOGGING operations that will break our standby database. So it is important that we confirm that this mechanism actually works. ut for some reason, it is showing nothing under v$datafile for the YESLOG tablespace. I know this operation will break the standby database (because of a break in archive-log activity). I am just not sure how to confirm in the data dictionary.

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