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Frequently queried table

Posted on 2004-04-21
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Last Modified: 2010-04-05
Hi all. I have several SQL tables queried frequently. Can I do anything to store them in memory, not on my hard disk? This slows me down greatly.
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Question by:hls1
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by:ben_afferson
ID: 10883039
Yeap, I’m interested too. I use tables to store preferences in most of my projects. RAM forever! :)
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eagle20001 earned 25 total points
ID: 10883053
The answer is simple – www.componentAce.com with their great product aka Absolute Database. The guys have developed something cool, I tell you. You’ll never regret that you work with it!
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by:mrnov1
ID: 10883067
AFAIK many DMS optimize most popular queries.
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Assisted Solution

by:shaneholmes
shaneholmes earned 25 total points
ID: 10883084
Borland has an example of implementing in-memory tables:

http://info.borland.com/devsupport/bde/delphifiles.html

In-Memory table example with source (Updated 02/17/98, Size 230,760 bytes)

In-Memory table example with source (Package Version) (Size 15,422 bytes)

In-Memory table example with source (Packaged EXE) (Size 22,528 bytes)
This examples takes a table, places all the information into an in-memory table, and then displays all the information in a string grid.

Hope this helps!

Shane
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Expert Comment

by:eagle20001
ID: 10883085
AbsDB does it better, I’ve checked. More than +150% in performance.
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by:shaneholmes
ID: 10883182
How do I implement In-memory table?

http://www.experts-exchange.com/Programming/Programming_Languages/Delphi/Q_20068246.html?query=memory+tables&searchType=topic

Search on the Delphi Super Page (http://delphi.icm.edu.pl/ or the mirror http://sunsite.informatik.rwth-aachen.de/delphi/) for the Memory table component. I believe there's a MemoryTable component there. I just can't find it now... (But I'll keep on looking...)

There's a way to implement your own version, btw, but it requires the BDE and knowledge of the BDE API. Or you start at the lowest point: TDataset and create your own TDataset-compatible component. Both are harder than just finding this existing component... ^_^
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