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Exadata system stats and MBRC
Last year Oracle added a new functionality to dbms_stats.gather_system_stats, making it more Exadata aware and thus let the optimizer make choices that might result in offloading more often. See this...
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Oracle Linux 6 and debuginfo packages
This is a quick post about how you can get the debuginfo packages on your Oracle Linux system in the easiest way thinkable: via yum. I guess most people reading this are familiar with Oracle Linux, and...
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The Exadata wait event ‘cell smart table scan’
The purpose of this post is to show what the wait event ‘cell smart table scan’ means, based on reproducible investigation methods. First of all, if you see the ‘cell smart table scan’ event:...
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Exadata and the passthrough or pushback mode
This blogpost is about the Exadata 'pushback' or 'passtru' mode, which gets triggered by excessive CPU usage on the storage server, during which the storage server will just ship blocks to the...
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Exadata: what kind of IO requests has a cell been receiving?
When you are administering an Exadata or more Exadata’s, you probably have multiple databases running on different database or “computing” nodes. In order to understand what kind of IO you are doing,...
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Exadata: measuring IO latencies experienced by the cell server
Exadata is about doing IO. I think if there’s one thing people know about Exadata, that’s it. Exadata brings (part of the) processing potentially closer to the storage media, which will be rotating...
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About cellcli calibrate
With cellcli you can run the calibrate command, this will measure the performance of your harddisks and flashcards. It will eventually report to you the throughput and amount of IOPS that was measured...
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Exadata: disk level statistics
This is the fourth post on a serie of postings on how to get measurements out of the cell server, which is the storage layer of the Oracle Exadata database machine. Up until now, I have looked at the...
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Compressing sqlplus output using a pipe
Recently I am involved in a project which requires a lot of data to be extracted from Oracle. The size of the data was so huge that the filesystems filled up. Compressing the output (using tar j...
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Info about Exadata’s imageinfo and rpm’s
Recently we noticed that imageinfo was displaying the following information at a customers site. Imageinfo was not displaying data i suspected, so a quick little blogpost about what was going on there....
View ArticleIt’s been a while…
It's been a bit quiet lately. Not because of lack of interest, on the contrary. I've been very busy. From a BI perspective, lots of things have changed. I focused more on the back-end side of things...
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Rolling back a failed rootupgrade.sh CRS upgrade
Recently i was upgrading a half rack Exadata to Grid Infrastructure 11.2.0.4. for a customer who had 1 node removed from the cluster, at least so we thought. While doing the upgrade we ran...
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Cellcli can lie to you…
Yes that is true, i said it, cellcli can lie to you there are some special cases were the output of cellcli is not the reality and you should double check it’s output with your standard OS tools. So...
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Inserts on HCC tables
There are already a lot of blogposts and presentations done about Hybrid Columnar Compression and i am adding one more blogpost to that list. Recently i was doing some small tests one HCC and noticed...
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Grid logging in 12.1.0.2
Most of the talk about Oracle’s release of 12.1.0.2 is about the InMemory feature, but more things have changed, for example some essential things about loggin in the Grid Infrastructure have changed....
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Oracle Big Data Appliance X4-2: First impressions
The last 2 weeks we are lucky enough to have the Big Data Appliance (BDA) from Oracle in our lab/demo environment at VX Company and iRent. In this blog post i am trying to share my first experiences...
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Patching the Big Data Appliance
I have been patching engineered systems since the launch of the Exadata V2 and recently i had the opportunity to patch the BDA we have in house. As far as comparisons go, this is were the similarities...
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