Slim3 Datastore‎ > ‎

Queries and Indexes

Every datastore query uses an index, a table that contains the results for the query in the desired order. An App Engine application defines its indexes in a configuration file named datastore-indexes.xml. The development web server can automatically generate suggestions for this file as it encounters queries that do not yet have indexes configured.

The index-based query mechanism supports most common kinds of queries, but it does not support some queries you may be used to from other database technologies. Restrictions on queries, and their explanations, are described below.