DDS uses indexes to improve query efficiency. If there is no index, DDS must scan each document in a collection to select the documents that match the query statement. If
In the early days, Cassandra was sometimes described as “a machine for making indexes.” This was a testament to Cassandra’s inherent resilience and flexibility, a clay out of which more robust structures could be molded. Cassandra today is a richer clay with greater possibilities. ...
They implement their approach also in MongoDB. Their approach is good because it allows saving data models. This approach will not be very good in case of data consolidation, when the same data will appear in different models in one way or another and, as a result, during consolidation, ...
class MyUser(Model): username = CharField(unique=True) email = CharField(index=True) class Meta: database=db db_table='MyUser' As a result, SQLiteStudio graphical user interface (GUI) shows indexes created as follows −In order to define a multi-column index, we need to add indexes ...
Another best practice we followed was to choose the right instances to ensure indexes and the working set fit in the cache. Because only approximately 2/3 of the available memory in an instance would be used for cache, we worked to identify the right ins...
All skill definition attributes are stored in a single JSON document in a designated “Application” collection within the MongoDB database. For the myNEB skill, the skill name was defined as “myNEB”, the invocation phrase was defined as “my n.e.b.”, and the short description was “...
They implement their approach also in MongoDB. Their approach is good because it allows saving data models. This approach will not be very good in case of data consolidation, when the same data will appear in different models in one way or another and, as a result, during consolidation, ...