Stefan Koehler

@OracleSK

Independent Oracle performance consultant and researcher. Internals geek. OakTable member. Oracle ACE.

Bavaria, Germany
Vrijeme pridruživanja: listopad 2014.

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  1. Prikvačeni tweet
    14. sij 2019.

    🛑 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 🤓

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  2. 5. velj
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  3. 4. velj

    I said it since years: No reason to switch from Oracle to HANA because of 2025 deadline. It is all SAP marketing 💩 ABAP CDS for anyDB availabe, Oracle IM optimization for BI implemented. AND NOW last fuzz about support deadline was also not true 🤓

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  4. 30. sij
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  5. 30. sij
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  6. proslijedio/la je Tweet
    30. sij

    As promised, I'll deliver another Troubleshooting Complex Oracle Performance problems hacking session today! This one will be more practical than the previous internals deep dive, but still fun! ;-) Date & Time: Thu 30 Jan 12pm-1:30pm ET Register here:

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  7. 29. sij

    Sometimes Netflix documentations are frighteningly on time 😯

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  8. 29. sij

    Hey Removing legacy app on Mac OSx and I should use browser extension instead. Are you kidding me? Need to open browser any time when I want to access passwords & you get access to browser data. Time to switch to another password manager. What a bummer!

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  9. proslijedio/la je Tweet
    28. sij

    🚨ALERT: Current version of can delete files outside of the .patch_storage directory. Don't use it! Have a look at for more details.

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  10. 28. sij

    Hallo . Warum kommen in letzter Zeit die Prime Lieferungen mit garantierten Lieferdatum gehäuft nicht pünktlich an? Aktueller Fall: Ware am 25.01. mit Prime Lieferung 28.01. bestellt. Ware wurde aber erst heute Nacht um 03:15 versendet - kommt morgen an 🤷‍♂️

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  11. 21. sij

    Great news for my business in USA🇺🇸 ----------------- Got an official local US bank account for WIRE and/or ACH transfer now. No expensive SWIFT transfers for my clients anymore and better exchange rates for me. Win-Win situation plus better customer experience 🤓

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  12. 20. sij

    As we all know „Everything is better with Bluetooth!“ So I buy lights with Bluetooth for controlling on/off, color, brightness and so on 💡 Man I am such a geek 🤓🙈

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  13. proslijedio/la je Tweet
    19. sij
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  14. proslijedio/la je Tweet
    17. sij

    Oracle parser/optimizer (still) ignores any hints that come after an invalid hint *that happen to be reserved words*. The NOLOGGING hint hasn't existed since 10g, but still cause trouble. Here's an example with letter "C" - no problem, "D" - problem as D is a reserved word:

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  15. proslijedio/la je Tweet
    17. sij

    "aggregate group by elimination" - introduced in 12.2 with a bug that's not completely fixed even in 19.6:

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  16. 16. sij

    Philosophy question ⁉️ —————- Why are almost all major cloud tech events on-premises if cloud is the greatest 💩 that ever was invented? 🤔🧐 Think about it 🤓

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  17. 14. sij

    New Years resolution 2020: Be one of the real cool kids 🤓 Just kidding: Just need to investigate/test something for a client 🤪

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  18. 14. sij

    Restriction of DBMS_STATS not supporting extended statistics on virtual columns / group of expression is lifted with Oracle >= 12.2.0.1 in some way 🤓

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  19. 10. sij

    I usually rant about stuff that doesn't work but I have to say it again. is killing it with their support. Got question about SWIFT & EUR account and got custom 1.358 character reply with an extraordinary detailed explanation within 1.5 hour. This is outstanding 👍

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  20. 10. sij

    Be aware of an edge case with NDV algorithm and histograms on a single value column with Oracle version > 12 🤓 Oracle bug #30205756:

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  21. 9. sij

    Today I took out my old calculator from my school time because a friend‘s kid needs some help with his physic class. Man am I so old? This calculator felt like the 60s but it was from late 90s. When I turned it on I thought it was broken because of that bad display 🤣🤓

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