Re: CoreData Indexing is it possible?
Re: CoreData Indexing is it possible?
- Subject: Re: CoreData Indexing is it possible?
- From: Diederik Hoogenboom <email@hidden>
- Date: Tue, 18 Sep 2007 07:28:25 +0200
AFAIK it is not mentioned in any public documentation. It has been
mentioned once or twice on this list though.
It is not really an API; it is more a "tag" in your model that will
trigger the index to be created when creating your store.
Diederik
--
Diederik Hoogenboom
Obvious Matter - DiskLibrary for Mac
http://www.obviousmatter.com
On 17-sep-2007, at 23:33, Giovanni Donelli wrote:
That's great! Thank you for your reply. Is that a documented
functionality?
I have google it and it seems there is no documentation on it, is
it a private API?
once again, thank you!
Giovanni
On 9/17/07, Diederik Hoogenboom < email@hidden> wrote:
It is possible to add a index using the Model Designer: create an
attribute key called "_NSCreateIndex" without a value for the
attribute for which you want the index to be created.
Some remarks:
- Inserts and saves might become slower as the index has be to
maintained.
- Don't expect noticeable improvements for data sets under 200k
objects.
Kind regards,
Diederik
--
Diederik Hoogenboom
Obvious Matter - DiskLibrary for Mac
http://www.obviousmatter.com
On 17-sep-2007, at 12:58, Alexey Zakhlestin wrote:
well, if you use sqlite as a coredata backend, that is certainly
possible to do (at least by using sqlite-native calls, not sure if
coredata has native interface for that)
On 9/16/07, Giovanni Donelli < email@hidden> wrote:
Dear Cocoa Gurus, first I have to say that Core Data is
awesome :-)
When I took my Comp. Science class about database they taught me
that by
building an index on a specific table attribute the search can
be dramatically speeded up (if the search involves that attribute).
Is there a way to do the same think with a core data database? I
have a
table with 10 attributes, but the user can search only by using
one. It
would be great to optimize the table for the retrieval of that
specific
attribute. Is that possible?
Thank you!
Giovanni Donelli
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Alexey Zakhlestin
http://blog.milkfarmsoft.com /
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