#SMARTDB
09.01.2020

The curious case of enq: TX – row lock contention

So we had a doubtful pleasure of migrating a few databases from Oracle Exadata X3-2 to Oracle Exadata X7-2 Cloud at Customer. Why doubtful? Well, this a material for a whole different story with a lot of beer – let me just say, that CC gen 1 was a bit rough around the edges 😉 […]


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Exadata & SR-IOV
26.04.2016

Infiniband SR-IOV on Exadata OVM

Virtual hosts on Exadata with OVM are HVM and not PV. This is one of the limitations of Infiniband SR-IOV – can’t be used with PV. So there is a qemu used to emulate the hardware While accessing a physical device from within a DOMU we can see that actual work is being done on […]


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EXADATA+OVM
03.04.2016

Exadata & OVM: Unable to get map of the virtual network interfaces

This week I had a "pleasure" of reimaging Exadata server to use OVM. During this process we hit interesting problem – after the reimaging process there was no bridge at DOM0, corresponding to the client network – because of this, the OEDA sofware returned an error like this: The error was produced by this script: […]


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EXADATA
11.02.2016

Exadata – direct path write temp and flash disks

Some time ago one of my students asked me if temp segments are being written to flash disks on Exadata… Well I wasn’t sure 🙂 But recently I had some time to check it. Let’s create some query that will generate temp segment: Great. Now we have to do some tracing at the cell servers […]


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[PL] Browar z Wyrocznią
04.09.2015

Jak smakuje Browar z Wyrocznią

I było tak, że 31 dnia miesiąca sierpnia roku 2015, spotkali się entuzjaści Wyroczni w posiadłości AVIVA. I było tak, że dzierżąc kufle – po brzegi browarem wypełnione – zasiadło wielu aby posłuchać kilku, którzy chcieli się przemyśleniami swoimi podzielić. I stało się tak, że admin przepijał do dewelopera a deweloper do admina i pospołu dyskusja toczyła się wartka a […]


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EXADATA
07.05.2014

Exadata – skgxpinfo returns UDP after reconfiguration

We had to change the hostnames on Exadata with one of the customers. It is a well known fact that RAC doesn’t like such changes – we had to reconfigure the cluster and after the whole process I found the funny thing: So let’s try to turn RDS on 🙂 After shutting down all cluster […]


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