Usage Restrictions

Functionality Limitations

A single instance only provides a single node.
Custom remote_servers configuration by users is not supported. There is only one remote_servers in a cluster named: ck_cluster.
For dual replicas, DDL statements must be executed using the ON CLUSTER ck_cluster syntax.
High availability must use the Replicated* table engine.
To ensure cluster stability and data safety, horizontal scaling is not supported.

Object	Restrictions
Database Name	Database names cannot be the same as built-in databases like “system.”
Table Name	Table names cannot contain quotes, exclamation marks (!), or spaces. Table names cannot be SQL reserved keywords.
Column Name	Column names cannot contain quotes, exclamation marks (!), or spaces. Column names cannot be SQL reserved keywords.
Password	Passwords must be 8-30 characters long. Cannot contain illegal characters outside [A-Z], [a-z], [0-9]. Must include both uppercase and lowercase letters and numbers.