Free DataStax Apache-Cassandra-Developer-Associate Exam Questions

Primary keys:

You execute queries with CL THREE on a single datacenter cluster with RF 3.

Why all operations are strongly consistent?

What values are stored in the pop column after the following sequence?

1. CREATE TABLE countries (

2.   country text,

3.   state text,

4.   pop int STATIC,

5.   PRIMARY KEY (country, state)

6. );

7.  

8. INSERT INTO countries (country, state, pop) VALUES ('USA', 'Oregon', 4200000);

9. INSERT INTO countries (country, state, pop) VALUES ('USA', 'Idaho', -1);

10. INSERT INTO countries (country, state, pop) VALUES ('USA', 'Idaho', 1700000);

You have a single datacenter 10-node cluster with a replication factor of 3.

What can NOT happen on an UPDATE query for one single row, when the consistency level is set to ONE?

What is wrong with this user-defined type (UDT) definition?

1. CREATE TYPE States (

2.   id uuid PRIMARY KEY,

3.   name text

4. );