IMDB shared over different application instances.

Question

0.00/5 (No votes)

See more:

Hello All,

I would like to know if somebody has already looked for an in-memory shareable database? I would like to use it for sharing complex objects between to applications over memory to be as fast as possible.

I have started to evaluate: NDatabase (http://ndatabase.codeplex.com/[^])

I just could not get the in-memory database created from the first instance available in the second one.

Do you think, this can be possible ? That would really be handy to have such a solution.

Thank you very much in advance for your inputs.
Best regards.
SuperMiqi

Posted 16-Jan-15 1:56am

SuperMiQi

Add a Solution

Comments

Zoltán Zörgő 16-Jan-15 8:09am

What makes you thinking that in-memory databases, or especially this one is supporting shared mode between processes? Sharing memory between processes is quite complicated thing... I don't know of anything on Windows capable of this.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

**Zoltán Zörgő** · Answer 1 · 2015-01-16T02:36:00

Solution 1

IMDB's are not for that, not on Windows anyway. There other fast methods for IPC, like memory-mapped files: http://coders-corner.net/2013/03/22/inter-process-communication-with-memory-mapped-files-part-01-transfer-a-data-structure-and-an-object/[^]

Posted 16-Jan-15 2:36am

Zoltán Zörgő

Comments

SuperMiQi 16-Jan-15 8:40am

Hello,
Thank you for your quick answer.
I have a very complex object and In-Memory style database would make it easier to update only a few property values from a deep object.
I am using a geometry object and inside, I have components, lines, triangles, ...
What could you recommand me as best alternative ?

Thank you very much in advance for your inputs.
Best regards.
SuperMiqi

Zoltán Zörgő 16-Jan-15 8:46am

Keep in mind, that keeping things in-memory is quite expensive, do you really need IPC that fast? I am pretty confident that any object store that enables you to use native communication or at least named pipe, will be fast enough. As RDBMS (thus EF and so on) looks not the best approach for you, I suggest you look around in NoSQL field

SuperMiQi 16-Jan-15 10:09am

The goal is to replace PInvoke to dig into memory to reach some parcel of data in a database style way.

What could be the best way to proceed then ?
This seems maybe there is a hole on the market then.

Zoltán Zörgő 16-Jan-15 13:37pm

If you stick to shared memory mode, try MMF from above.

SuperMiQi 17-Jan-15 9:04am

Hello,
Thank y ou for your answer.
What does mmf mean?
Thank you.

Zoltán Zörgő 17-Jan-15 13:48pm

Memory Mapped File

SuperMiQi 19-Jan-15 11:25am

Hello All,

If I use memory mapped file, I need to have a special structure to be able to change a simple property field of a sub object and also inform the reader which part to update. I do not want to reconstruct my global object all the time as I can have huge sub collection items.

Zoltán Zörgő 19-Jan-15 13:05pm

As long as you don't want to change often the size of the file, you are free to use it as any other. I suggest you re-read the first link I have provided. The solution posted here will also help you: http://stackoverflow.com/questions/13319351/writing-packed-structs-with-a-memorymappedviewaccessor-bug

SuperMiQi · Answer 2 · 2015-01-16T04:08:00

Solution 2

The goal is to replace PInvoke to dig into memory to reach some parcel of data in a database style way.

What could be the best way to proceed then ?
This seems maybe there is a hole on the market then.

Posted 16-Jan-15 4:08am

SuperMiQi