ios - why does -openWithCompletionHandler so slow -


i have coredata database has 3 entities:"card", "record", "stat", "card" has 3000 objects in , "card" has no blob attribute (i know blob attribute may slow), other 2 entities has no objects.

i debugged on iphone4, when opening database, found quite slow,

here code:

nslog(@"database start open...");         [self.database openwithcompletionhandler:^(bool success) {             nslog(@"copy & open success: %d", success);             callback(yes);         }];

here logs:

2013-05-13 13:11:54.776 suishoubei[1670:707] database start open... 2013-05-13 13:11:54.943 suishoubei[1670:1b03] coredata: annotation: connecting sqlite database file @ "/var/mobile/applications/850d8afd-ba6e-4e64-a150-507d5cd645fb/documents/default database/storecontent/persistentstore" 2013-05-13 13:11:54.950 suishoubei[1670:1b03] coredata: sql: pragma cache_size=200 2013-05-13 13:11:54.956 suishoubei[1670:1b03] coredata: sql: select z_version, z_uuid, z_plist z_metadata 2013-05-13 13:11:57.941 suishoubei[1670:707] copy & open success: 1

from coredata log, spent 3 seconds select z_version, z_uuid, z_plist z_metadata, , these fields , data managed corecode framework itself. , took longer(>10s).

i don't know why took long, , how make faster ?

thanks.


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