ClickHouse is a columnar database management system (DBMS) designed for online analytical processing (OLAP) of queries. It is known for its high performance and efficiency in handling large volumes of data. ClickHouse is widely used for real-time analytics and is capable of processing billions of rows per second.
When working with ClickHouse, you might encounter the error message: DB::Exception: Code: 1020, e.displayText() = DB::Exception: Cannot create database. This error indicates that the system is unable to create a new database as requested.
Upon attempting to create a database, the operation fails, and the above error message is displayed. This prevents the creation of the database and any subsequent operations that depend on it.
Error code 1020 in ClickHouse is associated with database creation failures. This can occur due to several reasons, including syntax errors in the SQL command or insufficient permissions to create a database.
To resolve this issue, follow these steps:
Ensure that the SQL command used to create the database is correct. The basic syntax is:
CREATE DATABASE database_name;
Replace database_name with your desired database name. Check for any typos or syntax errors.
Verify that the user has the necessary permissions to create a database. You can check user privileges with the following query:
SHOW GRANTS FOR current_user;
If the user lacks the CREATE privilege, you may need to grant it:
GRANT CREATE ON *.* TO 'username';
Replace username with the actual username.
Examine the ClickHouse server logs for any additional error messages or warnings that might provide more context. Logs are typically located in /var/log/clickhouse-server/.
For more information on managing databases in ClickHouse, refer to the official ClickHouse documentation. If you continue to experience issues, consider reaching out to the ClickHouse community for support.
Let Dr. Droid create custom investigation plans for your infrastructure.
Start Free POC (15-min setup) →
