About

Martin Klier

usn-it.de

Oracle RAC 12.2 on SLES12 – How to disable Hardware Lock Elision Support

The Problem In the last week, I had to set up an Oracle RAC (and thus, the Clusterware) version 12.2.0.1 on SuSE Linux Enterprise Server 12 SP2 (SLES12 Sp2). The gridSetup.sh failed latest in root.sh of the first node with a kinda non-intuitive error: CRS-5804: Communication error with agent process CRS-4000: Command Start failed, or […]

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Performance is rarely an accident (Deutsch)

Some time ago, I saw a great presentation of Cary Millsap: „Thinking clearly about performance”. It was obviously relevant for our internal developers, so he unhesistantly granted me permission to reproduce some of his ideas for us. Cary, thank you very much! Here you can see, what I made out of the topic, mostly for […]

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Speaking at COLLABORATE 14: “YOUR machine and MY database – a performing relationship!?”

I’m excited to announce that IOUG accepted my talk “YOUR machine and MY database – a performing relationship!?” for COLLABORATE 14 in Las Vegas. I’d love to see you there – for tech talk, gossip and meeting old and new friends! Abstract: Databases affect machines, machines affect databases. Optimizing one is pointless without knowing the […]

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World’s fastest SATA drive: WD VelociRaptor WD3000GLFS

Hi, imagine a 2,5″ SATAII disk in a 3,5″ heat sink. It’s 300 GB in size, 120MB/s buffer-to-disk rate, 16 MB Cache, 10.000 RPM, consuming 6 Watts under load. Look here. I think this baby should take up to 150 IO/s, in combination with RAID 0+1 and a decent RAID controller or/and (Oracle’s) ASM this […]

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