Nexxezz / bd201-m09-NoSQL

bd201-m09-NoSQL

• Please download the file
  • download file
    https://courses.epam.com/asset-v1:EPAM+201BD+2019.1+type@asset+block/NoSQL_labwork.7z
  • download cassandra docker container
    docker pull cassandra
  • run cassandra container docker run --name cassandra --network some-network -d cassandra
  • copy labwork files from downloaded archive to container docer cp /home/labwork/* cassandra:/home/
• Create a Keyspace for KillrVideo
  • CREATE KEYSPACE killrvideo WITH replication = {'class':'SimpleStrategy', 'replication_factor' : 1 }; (screenshot 1)
• Create a table to store video metadata
  • run cqlsh with cqlsh command
  • use killrvideo keyspace
    • USE killrvideo; (screenshot 1)
  • create table schema for videos
    • CREATE TABLE videos( video_id TIMEUUID PRIMARY KEY, added_date TIMESTAMP, desription TEXT, title TEXT, user_id UUID); (screenshot 2)
• Load the data for the video table from a CSV file
  • COPY videos FROM 'videos.csv' WITH HEADER = TRUE; (screenshot 2)
  • query table
    • SELECT * FROM videos LIMIT 10; (screenshot 3)
    • SELECT COUNT(*) FROM videos; (screenshot 4)
    • SELECT * FROM videos WHERE video_id=6c4cffb9-0dc4-1d59-af24-c960b5fc3652; (screenshot 5)
  • delete data from table
    • TRUNCATE videos; (screenshot 6)
• Create a new table that allows querying videos by title and year using a composite partition key
  • CREATE TABLE videos_by_title_year( title TEXT, added_year INT , added_date TIMESTAMP, desription TEXT, user_id UUID, video_id UUID, PRIMARY KEY (title,added_year)); (screenshot 7)
  • load the data from csv file
    • COPY videos_by_title_year FROM 'videos_by_title_year.csv' WITH HEADER = TRUE; (screenshot 7)
  • query table
    • SELECT * from videos_by_title_year LIMIT 10; (screenshot 8)
    • SELECT * FROM videos_by_title_year WHERE added_year = 2015; (screenshot 9)
• Create a 'videos_by_tag_year' table that allows range scans and ordering by year
  • CREATE TABLE videos_by_tag_year( tag TEXT, added_year INT, video_id TIMEUUID, added_date TIMESTAMP, description TEXT, title TEXT, user_id UUID, PRIMARY KEY(tag,added_year)) WITH CLUSTERING ORDER BY(added_year DESC); (screenshot 10)
  • COPY videos_by_tag_year FROM 'videos_by_tag_year.csv' WITH HEADER = TRUE; (screenshot 11)
• Create a user defined type
  • CREATE TYPE video_encoding ( bit_rates SET<TEXT>, encoding TEXT, height INT, width INT,); (screehsot 12)
• Alter an existing table and add additional columns
  • add columns 'tag' and 'video_ecoding' to videos table
    • ALTER TABLE videos ADD tag TEXT; (screenshot 13)
    • ALTER TABLE videos ADD encoding video_encoding; (screesnhot 13)
  • load the data from videos_encoding.csv
    • COPY videos(video_id,encoding) FROM 'videos_encoding.csv' WITH HEADER = TRUE; (screenshot 14)
  • query resulting table
    • SELECT * FROM videos LIMIT 2; (screenshot 14)