CREATE DIRECTORY

Function

CREATE DIRECTORY creates a directory. The directory defines an alias for a path in the server file system and is used to store data files used by users.

Precautions

• By default, only initial users can create directories. If enable_access_server_directory is enabled (for details, see enable_access_server_directory), users with the sysadmin permission can also create directories.
• By default, the user who creates a directory has the read and write permissions on the directory.
• The default owner of a directory is the user who creates the directory.
• A directory cannot be created for the following paths:
  • The path contains special characters.
  • The path is a relative path.
  • The path is a symbolic link.
• The following validity check is performed during directory creation:
  • Check whether the path exists in the OS. If it does not exist, a message is displayed, indicating the potential risks.
  • Check whether the database initial user omm has the R/W/X permissions for the OS path. If the user does not have all the permissions, a message is displayed, indicating the potential risks.
• In MogDB, ensure that the path is the same on all the nodes. Otherwise, the path may fail to be found on some nodes when the directory is used.

Syntax

CreateDirectory ::= CREATE [OR REPLACE] DIRECTORY directory_name
AS 'path_name';

Parameter Description

• directory_name

  Specifies the name of a directory.

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

• path_name

  Specifies the OS path for which a directory is to be created.

  Value range: a valid OS path

Examples

-- Create a directory.
mogdb=# CREATE OR REPLACE DIRECTORY  dir  as '/tmp/';