rapid persistent store for database from UIManagedDocument - core-data

Question

I created a database through a UIManagedDocument. If I add records slowly, everything works. If I rapidly (3-4 seconds between records), the records are out of order when fetched and may not survive across the app stopping/starting.
The UIManagedDocument is created in viewDidAppear and modified in "useDocument" (code provided below) which checks for non-existant database and creates it if necessary or just opens it.
Again, I think my issue is that the core data is not immediately stored to the SQLite.
-(void)setExampleDatabase:(UIManagedDocument *)exampleDatabase {
if ( _exampleDatabase != exampleDatabase ) {
_exampleDatabase = exampleDatabase;
NSMutableDictionary *pragmaOptions = [NSMutableDictionary dictionary];
[pragmaOptions setObject:#"FULL" forKey:#"synchronous"];
[pragmaOptions setObject:#"1" forKey:#"fullfsync"];
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
pragmaOptions, NSSQLitePragmasOption,
[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
[NSNumber numberWithBool:YES, NSInferMappingModelAutomaticallyOption, nil];
exampleDatabase.persistentStoreOptions = options;
//
// Does the file exist?? Is not, create it.
if ( ! [[NSFileManager defaultManager] fileExistsAtPath: [self.exampleDatabase.fileURL path]] ) {
[self.exampleDatabase saveToURL:self.exampleDatabase.fileURL forSaveOperation:UIDocumentSaveForCreating completionHandler:^(BOOL success) {
//
// OK, the creation has been done, enable the add button so records can be created
self.addButton.enabled = YES;
}];
//
// The file exists, but it's close, so open it.
} else if ( self.exampleDatabase.documentState == UIDocumentStateClosed ) {
[self.exampleDatabase openWithCompletionHandler:^(BOOL success) {
if ( success ) {
//
// It's now successfully opened, enable the add button, load the data from
// the core data database and cause the objects to be displayed in the table view
// "getCounts" is immediately below this method
self.addButton.enabled = YES;
[self getCounts:self.exampleDatabase.managedObjectContext];
[self.tableView reloadData];
} else {
NSLog(#"Error opening a closed database");
}
} ];
} else if ( self.exampleDatabase.documentState == UIDocumentStateNormal ) {
//
// OK, the database is opened. Enable the add button, load the data from
// the core data database and cause the objects to be displayed in the table view
// "getCounts" is immediately below this method
self.addButton.enabled = YES;
[self getCounts:self.exampleDatabase.managedObjectContext];
[self.tableView reloadData];
} else {
NSLog(#"Something is wrong in useDocument - it exists in an unknown state");
exit(1);
}
}
}
- (void)viewDidLoad
{
[super viewDidLoad];
if ( ! self.exampleDatabase ) {
NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
url = [url URLByAppendingPathComponent:#"DefaultDb"];
self.exampleDatabase = [[UIManagedDocument alloc] initWithFileURL:url];
}
}