Learn more about computerscience with this collection
Understanding machine learning models
Improving data analysis and decision-making
How Google uses logic in machine learning
Match your query's ORDER BY to the clustering order
Cassandra stores columns on disk in the clustering order of your table. Therefore, to get the performance, your queries with ORDER BY should match the table's clustering order.
For example, if you often query the newest data in the table, then you should set your clustering order to be (insertion_time DESC):
CREATE TABLE timeseries ( event_type text, insertion_time timestamp, event blob, PRIMARY KEY (event_type, insertion_time) ) WITH CLUSTERING ORDER BY (insertion_time DESC);
1
6 reads
MORE IDEAS ON THIS
Reversing clustering order at query time scans the entire partition
Cassandra allows you to sort your query results in reverse clustering order, but it comes at a cost. Cassandra has to read all partition rows/columns and sort them in-memory, making your queries slower and increasing load on the cluster.
The slowdown is proportional...
1
7 reads
CURATED FROM
IDEAS CURATED BY
Alt account of @ocp. I use it to stash ideas about software engineering
Related collections
Other curated ideas on this topic:
Match your product to the right stores
Your retail strategy needs to match the marketability and USP of your product with the right store. This means considering factors such as the location of a store, how it fits into the local community, and whether or not your product will be appealing to its customers.
You may find that ret...
How to give better PowerPoint presentations and improve your slides to keep an audience engaged
Not every presentation is linear, and you might prefer to jump back and forth from sections of your deck to a common "table of contents," so you can tackle the presentation in any order. This can be handy, for example, if you're using a deck for training or education. PowerPoint's Zoom feature is...
Read & Learn
20x Faster
without
deepstash
with
deepstash
with
deepstash
Personalized microlearning
—
100+ Learning Journeys
—
Access to 200,000+ ideas
—
Access to the mobile app
—
Unlimited idea saving
—
—
Unlimited history
—
—
Unlimited listening to ideas
—
—
Downloading & offline access
—
—
Supercharge your mind with one idea per day
Enter your email and spend 1 minute every day to learn something new.
I agree to receive email updates