How do you drop a table in Cqlsh?

How do you drop a table in Cqlsh?

  1. Modify a user-defined type.
  2. Create a materialized view.
  3. Create a customized collection, user-defined type (UDT).
  4. Remove the named materialized view.
  5. Remove the named table.

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 I drop a column in Cassandra table?

Cassandra drops the column data during the next compaction. To force the removal of dropped columns before compaction occurs, use ALTER TABLE to update the metadata, and then run nodetool upgradesstables to put the drop into effect.

How do I drop a Cassandra database?

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 get rid of Cassandra keyspace?

To delete a keyspace using CQL

  1. Open a command shell and enter the following: cqlsh.
  2. Delete your keyspace by entering the following command at the keyspace prompt ( cqlsh: keyspace_name > ). DROP KEYSPACE IF EXISTS “myGSGKeyspace” ;
  3. Verify that your keyspace was deleted. SELECT * from system_schema. keyspaces ;

How does delete work in Cassandra?

1 Answer. A DELETE statement removes one or more columns from one or more rows in a table, or it removes the entire row if no columns are specified. Cassandra applies selections within the same partition key atomically and in isolation. When a column is deleted, it is not removed from disk immediately.

How do you clear tombstones in Cassandra?


  1. Monitor the average transaction time to gauge how often to remove tombstones.
  2. Stop each Cassandra node.
  3. Edit the following settings in cassandra. yaml that affect tombstone removal and compaction: tombstone_threshold.
  4. Run reaper and compaction processes.
  5. Repeat steps for each node.
  6. Restart each node.

Is primary key mandatory in Cassandra?

Cassandra is a partition row store, and a component of the primary key, the partition key, identifies which node will hold a particular table row. At the minimum, the primary key must consist of a partition key. Composite partition keys can split a data set so that related data is stored on separate partitions.

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