CREATE DATABASE: Creating a Database

Basic Syntax

CREATE DATABASE [IF NOT EXISTS] Database_name [ON CLUSTER ClickHouse cluster name]

ClickHouse cluster name is default_cluster by default.

The syntax ON CLUSTER ClickHouse cluster name enables the Data Definition Language (DDL) statement to be executed on all instances in the cluster at a time. You can run the following statement to obtain the cluster name from the cluster field:

select cluster,shard_num,replica_num,host_name from system.clusters;

Example

-- Create a database named test.
CREATE DATABASE test ON CLUSTER default_cluster;
-- After the creation is successful, run the query command for verification.
show databases;
┌─name───┐
│ default    │
│ system     │
│ test       │
└──────┘