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From Stephen Fitch <0519...@acadiau.ca>
Subject Re: [jira] Created: (DERBY-646) In-memory backend storage support
Date Wed, 26 Oct 2005 17:06:57 GMT
Hi Norbert,

I have it working in the trunk embedded client in gentoo linux under jdk 
1.4.2.08 but it should theoretically run under jdk 1.3.1 and any recent 
release of derby. However, as far as I can tell the network 
client/server doesn't support alternate implementations of 
StorageFactory.  I'm still trying to track down if this is the case.  If 
it is, another connection URL attribute may have to be added for 
in-memory to work on the network side of things.

I'm having issues trying to test the performance as well since I'm 
competing with derby's page cache, java.nio's and my hard drive write 
cache (which I can't seem to turn off).

*VERY* preliminary numbers indicate a 10-20% performance increase on 
inserts which is well below my expectations.  I'm going to code up some 
tests for other operations today though.

If anyone's interested in trying the code out or going over it to look 
for areas of improvement it would be much appreciated.

I suppose the best way to distro it would to email a svn diff patch and 
source code for the new classes to the mailing list? I'm not looking to 
get it added to svn though, as it still needs work.

Regards,




Stephen Fitch
Acadia University








Toth-Gati Norbert wrote:
> Hi Stephen,
> 
> So now this means the support for in-memory storage is completed.
> I will give it a try. But glad you finally got to the end. Good job!
> 
> Regards,
>     Norbert
> 
> ----- Original Message ----- From: "Stephen Fitch (JIRA)" 
> <derby-dev@db.apache.org>
> To: <derby-dev@db.apache.org>
> Sent: Tuesday, October 25, 2005 8:33 PM
> Subject: [jira] Created: (DERBY-646) In-memory backend storage support
> 
> 
>> In-memory backend storage support
>> ---------------------------------
>>
>>         Key: DERBY-646
>>         URL: http://issues.apache.org/jira/browse/DERBY-646
>>     Project: Derby
>>        Type: New Feature
>>  Components: Store
>> Environment: All
>>    Reporter: Stephen Fitch
>>
>>
>> To allow creation and modification of databases in-memory without 
>> requiring disk access or space to store the database.
>>
>> -- 
>> This message is automatically generated by JIRA.
>> -
>> If you think it was sent incorrectly contact one of the administrators:
>>   http://issues.apache.org/jira/secure/Administrators.jspa
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>>   http://www.atlassian.com/software/jira
>>
> 
> 

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