跳转到主要内容

SHARE

What is a Share?​

In Databend Cloud, you can create shares to share the following types of database objects across organizations:

  • Table
  • View
  • UDF

When you create a share, you grant appropriate privileges to the other organizations for the data you want to share. Sharing data using a share does not physically copy to transfer the data to the organizations you want to share with. The shared data is READ-ONLY to the organizations. Users from the organizations can only query the shared data. Updating, inserting, and deleting the shared data are not allowed.

The following sections explain how to create and access a share in Databend Cloud:

Creating a Share​

To create a share to share your data across organizations, follow the steps below:

  1. Create an empty share using the CREATE SHARE command. The following example creates a share named myshare:
CREATE SHARE myshare;
  1. Grant appropriate privileges to the share you created using the GRANT <privilege> to SHARE command. Before granting privileges on the objects you want to share, you must grant privileges for the database that contains the objects. For more information about the available privileges, see GRANT <privilege> to SHARE. The following example grants the USAGE privilege to the share myshare for the database db1, then grants the SELECT privilege for the table table1 in the database db1:
GRANT USAGE ON DATABASE db1 TO SHARE myshare;
GRANT SELECT ON TABLE db1.table1 TO SHARE myshare;
  1. Add the organizations you want to share with to the share using the ALTER SHARE command. Each organization is assigned a unique tenant ID when they sign up in Databend Cloud. When you share across organizations, you specify organizations by their tenant IDs. The following example adds the tenants x and y to the share myshare:
ALTER SHARE myshare ADD TENANTS = x, y;

Accessing a Share​

Before accessing the data in a share, you need to create a database from the share using the CREATE DATABASE command. The following example creates a database named db2 from the share myshare:

CREATE DATABASE db2 FROM SHARE myshare;

To access the shared data, code a SELECT statement like this:

SELECT * FROM db2.table1 ...