ALTER SCHEMA

Function

ALTER SCHEMA alters the attributes of a schema.

Precautions

• Only the owner of a schema or users granted with the ALTER permission on the schema can run the ALTER SCHEMA command. The system administrator has this permission by default. To change the owner of a schema, you must be the owner of the schema or system administrator and a member of the new owner role.
• Only the initial user is allowed to change the owner of the pg_catalog system schema.

Syntax

• Alter the tamper-proof attribute of a schema.

  AlterSchema ::= ALTER SCHEMA schema_name { WITH | WITHOUT } BLOCKCHAIN

• Rename a schema.

  AlterSchema ::= ALTER SCHEMA schema_name
      RENAME TO new_name;

• Change the owner of a schema.

  AlterSchema ::= ALTER SCHEMA schema_name
      OWNER TO new_owner;

Parameter Description

• schema_name

  Specifies the name of an existing schema.

  Value range: an existing schema name.

• RENAME TO new_name

  Rename a schema. If a non-administrator user wants to change the schema name, the user must have the CREATE permission on the database.

  new_name: new name of the schema.

  Value range: a string. It must comply with the identifier naming convention.

• OWNER TO new_owner

  Change the owner of a schema. To do this as a non-administrator, you must be a direct or indirect member of the new owner role, and that role must have the CREATE permission on the database.

  new_owner: new owner of the schema.

  Value range: an existing username or role name.

• { WITH | WITHOUT } BLOCKCHAIN

  Alters the tamper-proof attribute of a schema. Common row-store tables with the tamper-proof attribute are tamper-proof history tables, excluding foreign tables, temporary tables, and system catalogs. The tamper-proof attribute can be altered only when no table is contained in the schema. In addition, the temporary table mode is not supported. Alter the tamper-proof attribute in the toast table schema, dbe_perf schema, and blockchain schema.

Examples

-- Create the ds schema.
MogDB=# CREATE SCHEMA ds;

-- Rename the current schema ds to ds_new.
MogDB=# ALTER SCHEMA ds RENAME TO ds_new;

-- Create user jack.
MogDB=# CREATE USER jack PASSWORD 'xxxxxxxxx';

-- Change the owner of ds_new to jack.
MogDB=# ALTER SCHEMA ds_new OWNER TO jack;

-- Delete user jack and schema ds_new.
MogDB=# DROP SCHEMA ds_new;
MogDB=# DROP USER jack;

Helpful Links

CREATE SCHEMA，DROP SCHEMA