Migrating from Windows to Linux with Active Duplicate for standby – problem with 11.2.0.4

Recently I was working on migrating Oracle 11.2.0.4 database running on Windows, to new hardware infrastructure on Linux. This Oracle version is with us for quite a long time, plus migration from Windows to Linux is quite common (fortunately in that direction…;)), so when I got an error while trying to use Active Duplicate feature to create a standby database, I was quite sure I’ll be able to quickly find the solution either in MOS or elsewhere. Indeed, I found several blog posts with exactly the same error, but solution mentioned there was not working for me.

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Smart way to run commands on many *nix machines from (not only) Windows client

Having a need to run the same set of commands on many machines is a very common task for IT engineers of all kind. If you want to do it efficiently and in a smart way (e.g. to run it only on machines with specific set of conditions), I have an example, that could be added to your toolbox.

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XFS on RHEL6 for Oracle – solving issue with direct I/O

Originally posted on “Databases at CERN” blog

Recently we were refreshing our recovery system infrastructure, by moving automatic recoveries to new servers, with big bunch of disks directly connected to each of them. Everything went fine until we started to run recoveries – they were much slower than before, even though they were running on more powerful hardware. We started investigation and found some misconfigurations, but after correcting them, performance gain was still too small.

Continue reading “XFS on RHEL6 for Oracle – solving issue with direct I/O”