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From Tim Troup <Tim.Tr...@ed.ac.uk>
Subject Re: Tuning Derby: OutOfMemoryError
Date Thu, 08 Feb 2007 14:53:07 GMT
Hi,

I increased the heap to 256MB and the delete statement completed  
after about 2 hours.
During this time derby was using around 190MB pretty steadily.

Thanks again,

Tim

On 8 Feb 2007, at 12:47, John Embretsen wrote:

> Tim Troup wrote:
>
>>> May I ask which JVM (vendor and version) you are using? I find it  
>>> strange that you run out of heap space in this case, but this of  
>>> course depends on what heap settings your JVM is using... (and  
>>> what you do before executing that delete statement).
>>>
>> I am running Mac OS X 10.4.8 with the JVM provided by apple:
>> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-112)
>> Java HotSpot(TM) Client VM (build 1.5.0_06-64, mixed mode, sharing)
>> I haven't made any modifications so I assume derby sues some  
>> default heap size.
>
> Given the version information above, I assume your default max heap  
> size is 64 MB. But I have no experience running Java on Mac, so I  
> cannot say for sure.
>
>> I don't do anything proir to issuing the delete statement beyond  
>> starting up the server.
>
> OK, that's interesting. Do you know roughly how many tuples are in  
> your tables? I've never seen a single (delete) statement using as  
> much as up to ~60 MB heap space before. Can anyone explain this?
>
> If the problem persists, it would probably help to provide a small,  
> reproducible test case.
>
>
> -- 
> John
>
>
>


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