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CoreData XML / SqLite differences
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CoreData XML / SqLite differences


  • Subject: CoreData XML / SqLite differences
  • From: Greg Hoover <email@hidden>
  • Date: Wed, 3 May 2006 18:59:47 -0700

I figured I'd test out the difference in speed between an xml persistent store and sql store. So using the sample Apple code, I migrated my existing XML store to SQL. Only after doing this I ran into a crop of exceptions. After a little digging I found that SQL stores have limitations in terms of multiple threads talking to them simultaneously. Has anyone else encountered this, and does anyone have a good workaround? It seems like for consistency, Apple would enforce the same thing on XML stores, no?

The exceptions I've been receiving are:

Exception raised during posting of notification. Ignored. exception: _obtainOpenChannel -- NSSQLCore 0x4cabaa0: no database channel is available

Exception raised during posting of notification. Ignored. exception: Fetching maximum primary key for entity failed

and the even more interesting:

Exception raised during posting of notification. Ignored. exception: library routine called out of sequence

Thanks.

-GH
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