What are Materialized Views? MVs are basically a view of another table. Straight away I could see advantages of this. To work around that issue you can disable the # meta data columns in the materialized view by setting this property to off. let’s understand with an example.. Let’s first define the base table such that student_marks is the base table for getting the highest marks in class. I recommend being very cautious about Materialized Views - their failure cases are problematic, and poorly understood. Back in 2015, Cassandra 3.0 introduced materialized views as an automated way of denormalization so you didn’t have to design and maintain tables manually. I was trying out the Cassandra 3.0 alpha to see how materialized views work and following the example shown here.. • Two copies of the data using different partitioning and placed on different replicas • Automated, server-side denormalization of data • Native Cassandra read performance • Write penalty, but acceptable performance 3. While working on modelling a schema in Cassandra I encountered the concept of Materialized Views (MV). Hello Team I am facing with an issue in the refresh of materialized view.. So any CRUD operations performed on the base table are automatically persisted to the MV. Denormalization is necessary to scale reads, so the performance hits of read-before-write and batchlog are necessary whether via materialized view or application-maintained table. meta-in-events-by-tag-view = on # replication strategy to use. Materialized Views vs Manual Denormalization. # because Cassandra validates the "CREATE MATERIALIZED VIEW IF NOT EXISTS" # even though the view already exists and will not be created. Example Let’s use the video-sharing site killrvideo.com as an example where we have a table comments_by_video that stores all the comments posted by users for each video. The example works when a whole partition is deleted from the base table, but when I delete an individual clustered row, it continues to appear in the materialized view. Materialized view creation syntax . I Have found that even though the mview is being refreshed correctly periodically, but still some of the data became out of sync. You alter/add the order of primary keys on the MV. I have created a materialized with fast refresh on a different server than the master table. The materialized views have been designed to alleviate the pain for developers, although it does not magically solve all the overhead of denormalization. Their consistency semantics are similarly challenging, and even assuming all of these things are fine they are quite constrained in capability in their current design (and that is an artefact of the design, not a short term constraint). In Cassandra, the Materialized view handles the server-side de-normalization and in between the base table and materialized view table ensure the eventual consistency. Materialized Views Carl Yeksigian 2. CASSANDRA-12489 consecutive repairs of same range always finds 'out of sync' in sane cluster Open CASSANDRA-12905 Retry acquire MV lock on failure instead of throwing WTE on streaming But can Cassandra beat manual denormalization? In this article, we will discuss a practical approach in Cassandra. Hi user@, Following a discussion on dev@, the materialized view feature is being retroactively classified as experimental, and not recommended for new production uses. 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