What is a Cassandra namespace?
A keyspace in Cassandra is a namespace that defines data replication on nodes. A cluster contains one keyspace per node. Given below is the syntax for creating a keyspace using the statement CREATE KEYSPACE.
What is the default keyspace in Cassandra?
A default keyspace can be defined for each session created off the main connection object. Without this option, each table will need its corresponding keyspace specified with each query. This option is useful for clusters which have only one (non-system) keyspace.
Where is my Cassandra keyspace?
Go to data tab > there you will see all keyspcaces created by you and some system keyspaces. You can see all tables under individual keyspaces and also replicator factor for keyspace.
What is Cassandra and why it is used?
Advertisements. Apache Cassandra is a highly scalable, high-performance distributed database designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure. It is a type of NoSQL database.
What is node and cluster in Cassandra?
A node is a single machine that runs Cassandra. A collection of nodes holding similar data are grouped in what is known as a “ring” or cluster.
What is DDL in Cassandra?
Data definition language (DDL) is the set of Cassandra Query Language (CQL) statements that you use to manage data structures in Amazon Keyspaces (for Apache Cassandra), such as keyspaces and tables.
How do I connect to a keyspace in Cassandra?
To select a keyspace in Cassandra and perform actions on it, use the keyword USE . The CQL shell switches to the name of the keyspace you specified. To change the current keyspace, use the same command with another name. Note: Whenever you create a table in Cassandra, you start by defining the keyspace.
How do I view Cassandra database?
Users can access Cassandra through its nodes using Cassandra Query Language (CQL). CQL treats the database (Keyspace) as a container of tables. Programmers use cqlsh: a prompt to work with CQL or separate application language drivers. Clients approach any of the nodes for their read-write operations.
What is Cassandra and Kafka?
Kafka is a distributed, partitioned, replicated commit log service. It provides the functionality of a messaging system, but with a unique design. Cassandra belongs to “Databases” category of the tech stack, while Kafka can be primarily classified under “Message Queue”.