Re: EO Caching
Re: EO Caching
- Subject: Re: EO Caching
- From: Jeffrey Simpson <email@hidden>
- Date: Fri, 07 Dec 2007 16:56:54 -0500
- Thread-topic: EO Caching
Thanks for the prompt reply. I forgot to mention we have our own batch
fetching that does a objectByPrimary key with a delegate that does not do a
database fetch to weed out the object in memory.
I discovered that by having the ecs use strong references it did what I
wanted. I also found out that is took to long to start an instance.
In our system each session has a default editing context that we only use
for querying. Any thoughts on every session sharing the same default ec?
This way the cache would slowly build.
I think the real answer is for us to slowly rewrite our application to use
more raw rows.
On 12/7/07 1:41 PM, "Chuck Hill" <email@hidden> wrote:
>
> On Dec 7, 2007, at 7:01 AM, Jeffrey Simpson wrote:
>
>> I want to preload some EOs and so they are cached. I have set
>> ERXEC.setDefaultFetchTimestampLag(86400000);
>
> That only applies to faulting, not fetching. You might want to look
> at the much feared EOSharedEditingContext or at Wonder's EO caching
> classes (there are three or so, IIRC). Also look at the "Cache in
> memory" setting in EOModeler.
>
>
>> I preload my EOs and do some
>> batch fetching. Later on I use a fetch spec to query from the
>> database some
>> of the cached EOs. They are fully fetched which I understand is the
>> case.
>> When I then batch fetch these EOs the system always runs fetches.
>
> It is not clear to me what code you are using here. I will note that
> all fetches (ec.objectsWithFetchSpecification) go to the database,
> even if the fetched data is then discarded. Batch fetching is a fetch.
>
>
>> The time
>> between this fetch and the preloading is < 5 minutes. If I run the
>> same
>> query in a the same ec then the EOs are cached. Any idea of why
>> there is no
>> caching between the 2 ecs?
>
> No, not without a clearer understanding of your code.
>
> Chuck
Jeffrey Simpson
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