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Questions tagged [internals]

The internals tag denotes questions about how things work, as opposed to how to accomplish something specific. Of course, how something works underneath will have practical implications, but internals questions aren't about how to do something; rather, how to understand something.

If you understand how a database or parser or version control system actually works, you'll be better at using it. Internals questions seek this kind of inside knowledge.

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Why does the MySQL file that contains my table's data not change size when I add data to the table?

The files in which MySQL stores the table data don't seem to grow when I add data to the tables. They seem to start at 9k and stay there. The context of this question is that I wanted to create a database on my fastest drive (which is not the drive…
user1476044
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Win32 Stack section base address

I know that to find a text (code) section's base address one should look for the .text section virtual address (except if ASLR is enabled), but what about stack? Is stack memory stored in the .data section along with the heap? If so I should look…
Johnny Pauling
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Oracle: How are sequences implemented?

To meet some odd business requirements, I'm going to have to implement my own sequence-like counters. I'm going to make a first cut of this in the obvious way, but I would like to understand a bit more about how Oracle implements sequences. For…
Mark Harrison
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OpenCVSharp and Unity3d: Internal compiler error

I want to use a Webcam and Blob Detection in Unity3D. I read somewhere that OpenCVSharp could be the option, but I have problems adding the dll's. Internal compiler error. See the console log for more information. output was:warning CS1685: The…
Aldwoni
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Accessing a pointer in an object's internal structure

I'm using the pyOpenSSL interface to the OpenSSL library but it is missing some functions I need and I can't or don't want to modify it to support these methods (for various reasons). So what I want to achieve, is to retrieve the OpenSSL object…
math
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SQL Server 2008 File Write Behaviors

Sort of a 101 question: with multiple files in a user defined filegroup, what is SQL Servers behavior when inserting rows? Round robin? Write until full and move on to the next? I have found some interesting posts regarding tempDb on this subject…
Bruce Krakower
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How to know when \Registry\Machine\Software key is loaded?

I want to access \Registry\Machine\Software key from a driver. The driver is loaded prior to the registry key. Do I have to poll the key availability? Or there is something I can wait for?
Sergey Podobry
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What is the most esoteric internal feature you have found or read about?

For me it is the security cookie created for each process to prevent buffer-overflow attacks. Tracking its creation with a debugger, it's created by xoring the Thread ID, the Process ID, the PerformanceCount the TickCount and more... And then if by…
Danra
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scalar variable and composite variable in PL/SQL oracle

I am new to Oracle and have just read that the scalar variable has no internal component whereas composite variable has an internal component. Could you please explain what is this internal component? How does it work? What is its purpose ?
user1252398
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No Access Region (0x0 through 0xFFFF) within User Virtual Address Space

I was reading a book on Windows Internals and on a Chapter for Virtual Memory it mentioned that the first 64KB Address range is reserved as a No-Access region and the reason mentioned was to avoid incorrect pointer reference. Can someone explain to…
Abhijit
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how to access chrome net-internals from the chrome extension code

is it possible to access, invoke and see the results of operations in chrome://net-internals/ WITH and from the extension code that I am trying to write/build?
javatar
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Pointer indirection check for invalid memory access and segmentation fault

struct A { int i; }; ... A *p = (A*) (8); // or A *p = 0; p->i = 5; // Undefined Behavior according C/C++ standard However, practically most of the system would crash (segmentation fault) for such code. Does it mean that all such…
iammilind
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executing external php files within loop

If I have a while loop and inside it I execute a php file via system(), and let's say this php file takes long to finish (e.g. downloading images, etc), will the main script wait for that to finish until going to the next loop? Now it looks like…
voldomazta
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Tracing internal sbcl package causes control stack overflow

In order to debug sbcl internals, I tried tracing sbcl internal packages. For example I tried (trace "SB-IMPL") This causes a control stack overflow. I tried changing the control stack size startup option while starting up SBCL, but no…
3d-indiana-jones
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Updating a specific file that was shipped with the apk?

I'd like to know if there is any way to update a specific file in the package (apk) that was originally shipped? In my case I need to make sure that a certain text file comes with the app when downloading the apk. However, I want to be able to…
Ted
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