[erlang-questions] 64-bit fragmented mnesia table benefits?

[Valentin Micic]

We used to run quite a substantial fragmented database ( about 250 milion 
entries spread around 512 fragments) on DETS (disc-only copy), and do not 
remember that memory was ever an issue (but then again, we had about 8GB of 
RAM). However, when a particular fragment get populated beyond, say, 
250,000 entries, insert and/or update of a particular table fragment (file) 
suffers  a considerable performance degradation.

As for recovery, well it could take quite some time, depending on size of 
the database.

V.
----- Original Message ----- 
From: "Christian S" <chsu79@REDACTED>
To: "Philip Robinson" <chlorophil@REDACTED>
Cc: "Erlang Questions" <erlang-questions@REDACTED>
Sent: Tuesday, March 25, 2008 4:49 PM
Subject: Re: [erlang-questions] 64-bit fragmented mnesia table benefits?


> On Tue, Mar 25, 2008 at 3:22 PM, Philip Robinson <chlorophil@REDACTED> 
> wrote:
>> Hello all.
>>
>>  It is my understanding that using a 64-bit operating system pretty
>>  much removes any of the size limitations for mnesia tables.
>
> The dets files still have their 32bit limitation.
>
>
> I've heard it rumoured here that dets have the following issues
> * when fragmented, the freelist is all in memory and occupies too much 
> memory
> * recovery time for large files are unresonable long
>
> Are they true, as in, has it been a problem for anyone?
>
> How do solutions that perform better do?
> _______________________________________________
> erlang-questions mailing list
> erlang-questions@REDACTED
> http://www.erlang.org/mailman/listinfo/erlang-questions
>