It sort of looks like: "The built-in indices are not efficient enough
for this query and your data."
When there is no compiste index for a multiple property query, the
'merge join' strategy will be used. I would guess you don't have a
composite index defined on those two fields, but there are a lot of
non-matching records that match one of the two criteria. You can
search the groups for an explanation of 'merge join,' or watch Brett
Slatkin's Scalable Complex Apps on App Engine talk.
You need to add the index:
- kind: Country
properties:
- name: country_code
- name: government_tax
Robert
On Tue, Feb 22, 2011 at 11:09, Jairo Vasquez <jairo.vasq...@gmail.com> wrote:
> Hi,
> I'm facing this situation and I don't know why is it happening:
> I do a query
> cs = Country.all().filter('government_tax =', 0.005).filter('country_code
> =', 'US').fetch(1000)
> and it works :)
> ... now I do it again but I change 0.005 to 0.5 and not if FAILS!!!
> cs = Country.all().filter('government_tax =', 0.5).filter('country_code =',
> 'US').fetch(1000)
>
> ERROR: An unexpected error occurred while tokenizing input
> The following traceback may be corrupted or invalid
> The error message is: ('EOF in multi-line statement', (135, 0))
> ---------------------------------------------------------------------------
> NeedIndexError Traceback (most recent call last)
> /Users/test/countries/<ipython console> in <module>()
> /Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/db/__init__.pyc
> in fetch(self, limit, offset, **kwargs)
> 1831
> 1832 raw_query = self._get_query()
> -> 1833 raw = raw_query.Get(limit, offset, config=config)
> 1834
> 1835 if self._compile:
> /Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/datastore.pyc
> in Get(self, limit, offset, **kwargs)
> 1350 batch = batcher.next_batch(_MAX_INT_32)
> 1351 else:
> -> 1352 batch = batcher.next_batch(limit)
> 1353 self.__cursor_source = lambda: batch.end_cursor
> 1354 self.__compiled_query_source = lambda: batch._compiled_query
> /Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/datastore/datastore_query.pyc
> in next_batch(self, min_batch_size)
> 1103 raise StopIteration
> 1104
> -> 1105 batch = self.__next_batch.get_result()
> 1106 self.__next_batch = None
> 1107 self.__skipped_results += batch.skipped_results
> /Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/apiproxy_stub_map.pyc
> in get_result(self)
> 532 return None
> 533 else:
> --> 534 return self.__get_result_hook(self)
> 535
> 536 @classmethod
> /Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/datastore/datastore_query.pyc
> in __query_result_hook(self, rpc)
> 1017
> *datastore_index.CompositeIndexForQuery(rpc.request)[1:-1])
> 1018 raise datastore_errors.NeedIndexError(
> -> 1019 str(exc) + '\nThis query needs this index:\n' + yaml)
> 1020 raise
> 1021
> NeedIndexError: The built-in indices are not efficient enough for this query
> and your data. Please add a composite index for this query.
> This query needs this index:
> - kind: Country
> properties:
> - name: country_code
> - name: government_tax
> Is this razonable?
> Anybody can explain me what happens?
> Thanks a lot
> --
> Jairo Vasquez
> Paymentez
>
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