- Open a command shell and enter the following: cqlsh.
- Delete your keyspace by entering the following command at the keyspace prompt ( cqlsh: keyspace_name > ). DROP KEYSPACE IF EXISTS “myGSGKeyspace” ;
- Verify that your keyspace was deleted. SELECT * from system_schema. keyspaces ;
How do I drop index in Cassandra?
- Modify a user-defined type.
- Create a materialized view.
- Create a customized collection, user-defined type (UDT).
- DROP FUNCTION.
- DROP INDEX. Drop the named index.
- DROP KEYSPACE.
- Remove the named materialized view.
How do I use 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.
How do I drop a schema in Cassandra?
In Cassandra, “DROP Keyspace” command is used to drop keyspaces with all the data, column families, user defined types and indexes from Cassandra. Cassandra takes a snapshot of keyspace before dropping the keyspace. If keyspace does not exist in the Cassandra, Cassandra will return an error unless IF EXISTS is used.
How do I export Cassandra keyspace?
If using cassandra-cli, you can use the ‘show schema;’ command to dump the whole schema. You can restrict to a specific keyspace by running ‘use keyspace;’ first. You can store the output in a file, then import with ‘cassandra-cli -f filename’. If using cqlsh, you can use the ‘describe schema’ command.
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. You may also read, How do I dry my pillow pillows?
Is Cassandra better for read or write?
Cassandra has an excellent single-row read performance as long as eventual consistency semantics are sufficient for the use-case. … Cassandra is excellent for write operations but not so fast on read operations. Both are rather fast but Cassandra does write operation faster. Check the answer of How do I edit a specific layer in Photoshop?
How do I see all Keyspaces in Cassandra?
- Accept this as answer! …
- Cassandra also allow a short-hand command as in: DESC keyspaces. …
- Worked for me , Thanks!
What is keyspace Cassandra?
A keyspace is a data container in Cassandra, similar to a database in relational database management systems (RDMBS). … Keyspaces are entirely separate entities, and the data they contain is unrelated to each other. In a Cassandra cluster, a keyspace is an outermost object that determines how data replicates on nodes. Read: How do I empty my koi pond?
How do you drop all tables in Cassandra?
You can do something like cqlsh -e ‘use ;describe tables’. This will return a list of tables that you can use to create queries to delete those tables.
How do you make a Cassandra dump?
To dump a keyspace structure we’ll use DESCRIBE data definition command. DESCRIBE command prints a description (DDL statements like create table) of a keyspace object. To dump table data we’ll use COPY TO command with default options. COPY TO command copies data from a table to a CSV (Comma-Separated Values) file.
What is durable writes in Cassandra?
Writes in Cassandra are durable. All writes to a replica node are recorded both in memory and in a commit log
What is cluster in Cassandra?
The cluster is a collection of nodes that represents a single system. A cluster in Cassandra is one of the shells in the whole Cassandra database. … A Cluster is basically the outermost shell or storage unit in a database. The Cassandra Cluster contains many different layers of storage units.