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Storage format / engine for my database

Posted on 2012-12-31
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Last Modified: 2013-01-08
I have a data set with ~7 million 32-character strings.  I am trying to find the most efficient storage for it.

It needs to be encrypted.
It needs fast searching.
It needs to be stand-alone.
It needs to be as compact as possible for online distribution.

I have tried Absolute Database but the resulting data file is about 800K.
I tried mOrmot SQLite3 and the data file is about 400K.
I tried a simple in-memory string list but it gobbles up about 450K of RAM.

What are my options?
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Question by:DSOM
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LVL 37

Expert Comment

by:Geert Gruwez
ID: 38734116
have you got any realistic numbers of what to expect ?

32x7000000 chars = 224000000 bytes (or 213 Mb)

400K / 213Mb is a factor of 1/532,
so thats a very good compression factor by the look of it

it looks like you already have what you look for

or is there an other problem ?
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Author Comment

by:DSOM
ID: 38734141
I don't know what to expect or what my options are which is why I asked.

I am hoping there might be something more suitable that I haven't found yet.

If it is indeed the best option that is fine too, I just need to know it.
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Expert Comment

by:Gerald Connolly
ID: 38734318
Well, i guess it depends on what you are really doing with this.

213MBytes  (NB "b" = bits, "B" = Bytes) is a tiny database and you would have to go back probably 10 years to find a memory stick it couldnt fit on!
Even on 4Mb broadband it will only take 5 minutes or so to download.

Why does it need to be compressed? It will just make it slower to access.
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Author Comment

by:DSOM
ID: 38734415
It only needs to be compressed during distribution/installation.  It is expanded on the end-users' computer.

Ugh, I just realized what I did.  Posting when tired and not braining properly.

It doesn't look like I can edit my original question.  Should have been:

I have tried Absolute Database but the resulting data file is about 800MB.
I tried mOrmot SQLite3 and the data file is about 400MB.
I tried a simple in-memory string list but it gobbles up about 450MB of RAM.
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Expert Comment

by:Sinisa Vuk
ID: 38734962
How does your strings look like? Is it something like hex numbers? or just random characters.
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Expert Comment

by:Gerald Connolly
ID: 38735118
why is 800MB a problem?

How are you distributing this db and how often are there updates?
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Author Comment

by:DSOM
ID: 38735444
It is too big.  Customers still on slow connections or even dialup have problems with it.  The download installer at almost 1GB is using up almost 5TB a month in bandwidth.  That is just for the initial distribution/installation.

It is being distributed via my website.  Updates are daily but just incrementally so that isn't a big problem.
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Expert Comment

by:Geert Gruwez
ID: 38738339
have you tried putting the strings in a text file and zipping it ?
zip is very good at text compression
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Author Comment

by:DSOM
ID: 38738506
I tried using a compressed string list.  But it takes up too much RAM when loaded.  From my original question "I tried a simple in-memory string list but it gobbles up about 450MB of RAM."
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Accepted Solution

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DSOM earned 0 total points
ID: 38738510
I am trying SynSQLite3 right now and it looks promising.  About 500MB on disk and almost zero memory footprint.  That database will compress down to about 300MB for distribution which is a huge improvement over almost 1GB.
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Expert Comment

by:Geert Gruwez
ID: 38739325
lol, i wasn't meaning for you to load as a stringlist
>> my idea was:
put all your text in a file.txt
> zip this file.txt

when you start your app or appinstaller:
> unzip the file
> load it into a database in the local environment

the local environment could be a company which hosts an enterprise database like sql server, oracle, etc ...
that way you can have 1 dictionary (at least i think it's a dictionary)
for all pc's in 1 local environment and you'd only have to do the upload once
and set the connection string on the others

>> i know it's a differrent ball game like this
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Author Comment

by:DSOM
ID: 38739426
When I do an incremental update it is a zipped text file that is imported.  However the original distribution contains the full current database.  The end-user won't have a database server aside from the one I run which they access over the Internet.  This isn't for enterprise customers, it's average home users.

The database on the customer's home computer is a stand-alone SQL database.
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Author Closing Comment

by:DSOM
ID: 38754116
This has ended up being the best option
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