Tanel Poder 🇺🇦

Creator of and a long time computer performance nerd.
Performance & Troubleshooting Training:

[Tanel Poder 🇺🇦 @TanelPoder]

Almost Summer Sale 2026: All my flagship video courses discounted until end of May!

Plus *free* Exadata Internals & Advanced Performance Metrics seminar videos!

https://t.co/86p5MLJicb

[SQL Daily @sqldaily]

You can have managed, serverless MCP Servers for your Oracle AI Databases in the Cloud

These enable you to talk to your database

But for critical reports you may want verified #SQL

@thatjeffsmith shows how to use predefined reports with the MCP server https://t.co/NCjZk0gLhM

[Matthew Prince 🌥 @eastdakota]

Welp, that happened faster than I predicted. Thought it would be end of 2027, then early 2027, but agentic traffic growing so fast that bots have now passed human traffic online for the first time in the Internet's history. https://t.co/2zX5bHdhsa

[dax @thdxr]

someone made a fork of opencode that routes through the unsecured ai endpoints from chipotle

[Tanel Poder 🇺🇦 @TanelPoder]

Turns out that I had dreamed up the database version when the scalable LMT "space header" feature was introduced.

It was introduced already in 12c, with the "_enable_12g_bft" parameter - enable 12g bigfile tablespace. When upgrading from an earlier version to 12c+, you still had to create a new tablespace with this setting was enabled (old ones do not get converted to the new scalable LMT space management).

The space header block (#2) now shows "KTFBN File Space Header" (not KTFB). I guess the N means "new".

Kun Sun has written an article about another issue, but covers the differences of old vs new 12c bigfile tablespace headers here:

https://t.co/JMfq7Hmdr1

[Tanel Poder 🇺🇦 @TanelPoder]

But now I can't find the article, I hope I didn't read it in my dreams or something 😅

Related, the old way is described here (the block#=2 in each datafile was the single LMT space management *header* block per file):

https://t.co/i82c4kYlEO

[Tanel Poder 🇺🇦 @TanelPoder]

Turns out that I had dreamed up the database version when the scalable LMT "space header" feature was introduced.

It was introduced already in 12c, with the "_enable_12g_bft" parameter - enable 12g bigfile tablespace. When upgrading from an earlier version to 12c+, you still had to create a new tablespace with this setting was enabled (old ones do not get converted to the new scalable LMT space management).

The space header block (#2) now shows "KTFBN File Space Header" (not KTFB). I guess the N means "new".

Kun Sun has written an article about another issue, but covers the differences of old vs new 12c bigfile tablespace headers here:

https://t.co/JMfq7Hmdr1

[Tanel Poder 🇺🇦 @TanelPoder]

Question for fellow Oracle nerds: I'm sure I saw a post recently about an Oracle 23/26 enhancement for more scalable LMT bigfile tablespace space management. Something like where now there can be multiple "KTFB Bitmapped File Space Header" blocks, instead of just one header block

[Tanel Poder 🇺🇦 @TanelPoder]

But now I can't find the article, I hope I didn't read it in my dreams or something 😅

Related, the old way is described here (the block#=2 in each datafile was the single LMT space management *header* block per file):

https://t.co/i82c4kYlEO

[Tanel Poder 🇺🇦 @TanelPoder]

I wont forget to pitch my xtop TUI tool (for eBPF xcapture output analysis) as well!

https://t.co/WEbwLl9gRP

[Tanel Poder 🇺🇦 @TanelPoder]

Hehe, strace-ui by @JaneStreetGroup folks:

https://t.co/4oSsGpJ02F

[Aitor Murguzur @murggu]

Solving the Identity Crisis for AI Agents
https://t.co/zZ0C2tTVA2

[Halvar Flake @halvarflake]

It's a gorgeous and funny bug.

Fwiw, I'm the biggest eBPF fanatic, but I don't think unprivileged users should be able to load arbitrary eBPF programs.

[Son Luong @sluongng]

Codex just found a “workaround” of not having sudo on my pc…

[Ben Dicken @BenjDicken]

Combining deep math theory with practical implementation leads to many cool things.

This is the heart-and-soul of computer science and engineering.

AWSs latest blog is a beautiful example, describing and visualizing the transformation from tree-based networks to pseudo-random graphs in their DCs.

Props to @ratulm and the other authors (who need to get on X dot com ASAP)

[Ben Dicken @BenjDicken]

https://t.co/XD2n7DQQwy

[P99CONF @P99CONF]

At our last #P99CONF, @tanelpoder launched the prod/GA ready version of xCapture v3 + xtop and demonstrated how it helps with real life troubleshooting scenarios. Watch the entire session for free: https://t.co/XYqI13bvQd

#ScyllaDB

[ayush🔮👨‍💻🔮 @ayushagarwal027]

Rust promises zero-cost abstractions. But how well does it actually deliver? 🦀

Two researchers dug deep, studying the compiler, modifying it, and collecting real performance data for a talk at C++Russia 2026.

150+ slides covering Rust's performance trade-offs in a systematic, data-driven way. Possibly the most comprehensive treatment of the topic to date.

Slides + repo: 🔗 https://t.co/E0sOBakG3s

#Rust #RustLang #SystemsProgramming #Performance #Compilers #CPlusPlus

[Tanel Poder 🇺🇦 @TanelPoder]

@_GGhh_ Yes that’s the plan!

[Tanel Poder 🇺🇦 @TanelPoder]

Almost Summer Sale 2026: All my flagship video courses discounted until end of May!

Plus *free* Exadata Internals & Advanced Performance Metrics seminar videos!

https://t.co/86p5MLJicb

[Tanel Poder 🇺🇦 @TanelPoder]

@chris_skyflier Nice!

I've just used "strings" on oracle binary and searched/navigated to the right-looking query text based on the first X characters of the string reported from v$fixed_view_definition (and I make sure that this is the only full string my search matches in the .strings output)

[Christoph Lutz @chris_skyflier]

A little script and some background information on how to extract v$ definitions directly from the oracle binary.

https://t.co/uOc9btLhVm