Storing UUIDs as RAW values is more efficient than strings But RAW can lead to implicit conversions => poor row estimates If you're stuck with string comparisons @Andrej_SQL shows how to improve row estimates with Extended stats Virtual columns https://t.co/9SPPa3NhmG

New post for #JoelKallmanDay! Ever wondered why the Oracle Optimizer sometimes ignores your histograms? Implicit data type conversions might be to blame. Here’s how to fix it without touching your SQL and with minimal schema impact. #Oracledatabase https://t.co/DkqCeAAqWc

Honored to speak at #HROUG2025 – celebrating its 30th anniversary in amazing Rovinj!🎉Huge thanks to the organizers for keeping this fantastic community going for 30 years!🙏 Let’s put some old SQL myths to the test together! #Oracle #SQL #Optimizer #Accenture #OracleAce

MERGE ... RETURNING is now supported in #Oracle23ai. In my view, it deserves more visibility in the documentation — it wasn’t easy to find. Even LLMs still claim it doesn’t exist (some even invent error codes). #SQL #MERGE @oracleace https://t.co/FpbYdL2oDS

Ten years after my first post on the quirks of MERGE and ORA-30926, I took a fresh look at how Oracle 23ai handles it. Clearer error messages, improved diagnostics, and fewer unnecessary restarts. Read the new blog post #Oracle23ai #SQL #MERGE @oracleace https://t.co/13xIIS7cIk

Did you know that refreshing HCC-compressed materialized views with atomic_refresh=true can multiply storage usage over time? Small details can have massive impacts. Read the new blog post. #Exadata #Oracle #HCC @oracleace https://t.co/sPsa6z6CPQ

Get rows in one table with no match in another with either c1 NOT IN ( SELECT c2 ... ) NOT EXISTS ( SELECT ... where c1 = c2 ) These perform the same in Oracle #SQL ...unless C2 includes NULL values => NOT IN returns no rows! @Andrej_SQL explores https://t.co/VGVFCcWMUS

My @AccentureDACH colleague @Andrej_SQL is going to talk about partition exhange at the @Hroug_Croatia #HROUG2024 conference @oracleace

Partition Exchange Reloaded by @Andrej_SQL at #hroug2024.

Everything you should know about block corruptions in #Oracledatabase with @CGohmannDE at #hroug2024

On this #JoelKallmanDay, I would like to follow up on my last year's post, comparing #SQL’s NOT IN and NOT EXISTS, focusing on their usage, interchangeability and some myths about performance differences. https://t.co/Vhxo8nRPgQ #Oracledatabase

And if you want to use your existing views and let SQL macros "inject" parameter, you can check the second part ( https://t.co/C8oITOekFk) of this post and also @StewAshton 's post:

I am absolutely thrilled to be presenting at the #HROUG2024 for the first time. Thanks @Hroug_Croatia for accepting my talks. In just two weeks! See you there! @oracleace

There have been some changes and improvements to the Online Statistics Gathering for Bulk Loads over the last few years. Here is the new blog post: #oracledatabase @oracleace https://t.co/YxVA8ueOYt

Oh and what I've missed to share so far: I will be speaking about SQL macros at the #DOAG2024-Conference in November in Nuremberg. Thank you @DOAGeV for accepting my talk. See you there! #sqlmacros #oracledatabase #sql @oracleace

And the second one about SQM and the WITH clause: https://t.co/BadEX9LpA9 #sqlmacros #oracledatabase #sql

Looking at the trace output for SQM expansion can help to interpret some error messages and perhaps understand some of the limitations. Two new blog posts about this: https://t.co/Wit4uCnC6L #sqlmacros #oracledatabase #sql @oracleace

Join AOUG Anwenderkonferenz 2024 next week for many great sessions presented by Oracle ACEs 👉 @alexnuijten @Ambili_Thots @Andrej_SQL @JrgDoppelreiter @martinberger_ch @Mirela_RoOUG @RoelH @rsantrod @oraclesean @stefanoehrli https://t.co/WFvZRRd0eB #OracleACE

As a data engineer, do I have to worry about optimizer statistics? In the second part is a typical example of why the performance immediately after loading the data can be suboptimal if you don't take care of the stats. #oracledatabase @oracleace https://t.co/OJ1bKVzRwU

I will talk about optimizer statistics at #AOUG Conference on June 17th, in particular what my responsibilities as a data engineer are. I think it's very important that it's not seen as just a DBA's job. Here is just one simple example of why: https://t.co/dD7F5YQdTW @oracleace