This document provides an overview of Cassandra operations and demonstrates how to set up Cassandra using Docker, create a keyspace and table, insert and query data, and work with keys and clustering. It shows how to create a keyspace and table, insert data into the table, perform various queries on the data including filtering and selections on the partition and clustering keys, and insert data with a time to live (TTL).

1. Cassandra Introduction
Basic Cassandra operations overview

2. Cassandra setup
○ ~$ docker pull cassandra
○ ~$ docker run --name cassandra1 -d cassandra
○ ~$ docker run --name cassandra2 -d -e
CASSANDRA_SEEDS="$(docker inspect --format='{{
.NetworkSettings.IPAddress }}' cassandra1)"
cassandra
○ ~$ docker run -it --name cqlsh --link
cassandra1:cassandra --rm cassandra sh -c
'exec cqlsh "$CASSANDRA_PORT_9042_TCP_ADDR"'
https://www.docker.com

3. Cassandra setup (docker)

4. Cassandra Query Language (CQL) is a query language for
the Cassandra database. The Cassandra Query Language
(CQL) is the primary language for communicating with the
Cassandra database. The most basic way to interact with
Cassandra is using the CQL shell, cqlsh.
CQL

5. CREATE KEYSPACE DEMO WITH REPLICATION = { 'CLASS' :
'SIMPLESTRATEGY', 'REPLICATION_FACTOR' : 2 };
USE DEMO;
Create keyspace

6. CREATE TABLE WHEATHER_FORECAST (SITE TEXT, SPECIES TEXT,
MEASUREMENTDATE TIMESTAMP, LATITUDE DOUBLE, LONGITUDE DOUBLE, VALUE
DOUBLE,
PRIMARY KEY((SITE, SPECIES), MEASUREMENTDATE)) ;
DESC WHEATHER_FORECAST;
Create Column Family

7. Create Column Family

8. INSERT INTO WHEATHER_FORECAST(SITE, SPECIES, MEASUREMENTDATE, LATITUDE ,
LONGITUDE, VALUE ) VALUES ('MY7', 'PM10', 1451628000000, 51.234, -
0.846, 44.4);
INSERT INTO WHEATHER_FORECAST (SITE, SPECIES, MEASUREMENTDATE, LATITUDE ,
LONGITUDE, VALUE ) VALUES ('MY7', 'PM10', 1451631600000, 51.234, -
0.846, 41.7);
Insert Data Rows

9. INSERT INTO WHEATHER_FORECAST (SITE, SPECIES, MEASUREMENTDATE, LATITUDE ,
LONGITUDE, VALUE ) VALUES ('MY7', 'PM10', 1451638800000, 51.234, -
0.846, 38.5);
INSERT INTO WHEATHER_FORECAST (SITE, SPECIES, MEASUREMENTDATE, LATITUDE ,
LONGITUDE, VALUE ) VALUES ('MY7', 'PM25', 1451639800000, 51.234, -
0.846, 18.8);
Insert Data Rows

10. SELECT * FROM WHEATHER_FORECAST;
SELECT * FROM WHEATHER_FORECAST WHERE SITE = 'MY7'; //ERROR
SELECT * FROM WHEATHER_FORECAST WHERE SPECIES = 'PM10'; //ERROR
SELECT * FROM WHEATHER_FORECAST WHERE SITE = 'MY7' AND SPECIES = 'PM10';
SELECT * FROM WHEATHER_FORECAST WHERE SITE = 'MY7' AND SPECIES = 'PM10'
AND MEASUREMENTDATE = 1451628000000;
Querying Data

11. Querying Data

12. ○ The Partition Key is responsible for data distribution across your nodes.
○ The Clustering Key is responsible for data sorting within the partition.
○ The Primary Key is equivalent to the Partition Key in a single-field-key
table.
○ The Composite/Compound Key is just a multiple-columns key
Keys & Clustering
CREATE TABLE WHEATHER_FORECAST (
SITE TEXT,SPECIES TEXT,
MEASUREMENTDATE TIMESTAMP,
LATITUDE DOUBLE,
LONGITUDE DOUBLE,
VALUE DOUBLE,
PRIMARY KEY ((SITE, SPECIES), MEASUREMENTDATE))
Composite Partition Key Clustering Key

13. SELECT * FROM WHEATHER_FORECAST WHERE SITE = 'MY7' AND SPECIES = 'PM10' AND
LATITUDE = 51.234; //ERROR
SELECT * FROM WHEATHER_FORECAST WHERE SITE = 'MY7' AND SPECIES = 'PM10' AND
LATITUDE = 51.234 ALLOW FILTERING;
SELECT * FROM WHEATHER_FORECAST WHERE SITE = 'MY7' AND SPECIES > 'PM10';
//ERROR
SELECT * FROM WHEATHER_FORECAST WHERE SITE = 'MY7' AND SPECIES IN ('PM10');
SELECT * FROM WHEATHER_FORECAST WHERE SITE = 'MY7' AND SPECIES IN ('PM10') AND
MEASUREMENTDATE >= 1451628000000;
Querying Data

14. SELECT MIN(SITE), MIN(SPECIES) FROM WHEATHER_FORECAST; //WARNING
SELECT MIN(SITE), MIN(SPECIES), MIN(MEASUREMENTDATE) FROM WHEATHER_FORECAST;
INSERT INTO WHEATHER_FORECAST (SITE, SPECIES, MEASUREMENTDATE, LATITUDE ,
LONGITUDE , VALUE) VALUES ('MY7', 'PM25', 1451639800000, 51.234, -0.846, 28.8);
//UPSERT
Querying Data

15. Querying Data

16. INSERT INTO WHEATHER_FORECAST (SITE, SPECIES, MEASUREMENTDATE, LATITUDE ,
LONGITUDE, VALUE ) VALUES ('MY7', 'PM10', 1451616000000, 51.234, -0.846,
88.4) USING TTL 30;
Insert with TTL