Kieran,
First off, I would certainly get rid of the relationship to the
million rows - very nasty stuff. I think I could use a little more
info on exactly what the data records are for and what type of access
pattern you need before I could make any further recommendations.
Oh - in answer to your question, you will only have a single array
fault for the million rows until it gets triggered. Then, you'll
actually try to load all million rows (so if they actually loaded,
they would be real, not faults).
Ken
On May 12, 2006, at 4:11 PM, Kieran Kelleher wrote:
OK, I've seen how to deal with this in the past somewhere on a WWDC
video or something, but for the life of me I cannot find the
approach right now and I am under the crunch to get this done.
I have DataList objects with up to a million related DataRecord
objects. DataList and DataRecord are related in a many-to-many
join. Usually a DataRecord belongs to no more than 50 DataLists.
So regular dataList.dataRecords() obviously crashes my app when
huge amount of data records in the relationship.
Am I understanding correctly in saying that fetching my one
DataList with a million related DataRecords will create a million
"faults"?
What is the strategy here?
Is it:
- turn off the dataRecords class property visibility (diamond icon)?
- kill the relationship to dataRecords in the DataList entity and
work with qualifiers, fetchspecs and raw rows to grab dataRecords
as needed? How does this affect creating relationships .... just
always add the DataList to the DataRecord's dataLists relationship?
Any best practice tips, pointers or links to same would be
appreciated.
Regards, Kieran
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