Stefan Koehler
@OracleSK
Independent Oracle performance consultant and researcher. Internals geek. OakTable member. Oracle ACE Alum. Sym42.
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🛑 2019 Is The Time For New Oracle Support/Troubleshooting Ways 🛑 • Tired of buying a huge contingent from a consultancy if you just want a few hours or days? • Tired of ticket/service request ping pong? • Wanna get to root cause quickly? I have the solution for you 🤓
lgwr: You have the control gdb: I have the control
NOPs and shifting trampolines is a fun on-going story all the time (e.g. 2-byte NOP, 0x66 prefixed and eBPF) 🤓 blogs.oracle.com/linux/post/ksp…
If you've ever felt the need to manually control adaptive lgwr features, this gdb script's got you covered: t.ly/lJIW1 😎 It lets you enable and disable adaptive scalable lgwr, fast log file sync, and log parallelism. Highly experimental, of course! Example 👇
Hallo @Hosteurope Für was gibt es bei Euch das KIS, wenn Ihr dort sowieso keine geplanten Wartungen mehr ankündigt oder Störungen veröffentlicht?
Any reason why the OVA image of the Oracle Database Free 23.x Virtual Appliance is not updated anymore? 23.8 is out for quite a time now but the OVA image is still 23.7 (23.7.0.25.01)? Thank you. @GeraldVenzl
Details about Spectre v2 Mitigations and speculative executions 🤓 blogs.oracle.com/linux/post/und…
For geeks: two bpftrace scripts to map UTS event and component names to their internal ids. t.ly/bGj0M t.ly/ypKuv Didn’t plan on it, but sometimes the rabbit hole chooses you... Turns out "oradebug doc" doesn't expose all trace events.
Profile Explorer is a tool for viewing CPU profiling traces collected through the Event Tracing for Windows (ETW) infrastructure on machines with x64 and ARM64 CPUs github.com/microsoft/prof…
It continues to amaze me time and again what bpf based tracing makes possible … been looking into Oracle write consistency and update restart mechanics recently and tinkered with a bpftrace script to detect restarts system-wide and in real-time: t.ly/MgyQ- 🤓
1/4 Interesting UPDATE restart variation: Oracle may try to update a row during the ALL LOCKED phase that wasn't returned and locked in the prior LOCK phase (row 0 in the example).
A visionary leader for a nation, and look at what we got: @Bundeskanzler with his „Sparbuch“ and „debt fantasies“ 🫣
Since a few hours I am going down the CPU scaling governors/drivers rabbit hole - Oh boy this is a mess 😱 Love the term "Autonomous frequency scaling" with Intel CPUs and we all know what this means 😅 Can't set fixed perf mode with active intel_pstate wiki.archlinux.org/title/CPU_freq…
Hey sweetie - Ghidra with XCOFF loader/support blog.silentsignal.eu/2021/04/06/add… It was a little bit messy to get it compiled and running with Ghidra on Kali 2024.3 but we can finally start digging
I will be speaking at the @ebpfsummit 2024 conference about a new way for approaching Linux system performance, with 0x.tools and eBPF! Free online event on September 11th, 2024 ebpf.io/summit-2024/ See you there!
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