DESCRIBE EXTERNAL VOLUME¶

Describes the properties of an external volume.

DESCRIBE can be abbreviated to DESC.

See also:

ALTER EXTERNAL VOLUME , CREATE EXTERNAL VOLUME , DROP EXTERNAL VOLUME , SHOW EXTERNAL VOLUMES

Syntax¶

DESC[RIBE] EXTERNAL VOLUME <name>
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Parameters¶

name

Specifies the identifier for the external volume to describe. If the identifier contains spaces or special characters, the entire string must be enclosed in double quotes (for example, "My object"). Identifiers enclosed in double quotes are also case-sensitive.

Output¶

The output of the command includes the following columns, which describe the properties and metadata of the object:

Column

Description

parent_property

The parent property. This column includes the STORAGE_LOCATIONS property, which holds a set of named cloud storage locations.

property

The name of the property. This column can include the properties listed in the following table.

property_type

The property type.

property_value

The value assigned to the property.

property_default

The default property value.

The property column can include the following properties of an external volume object:

Property

Description

allow_writes

Specifies whether write operations are allowed for the external volume.

storage_location_n

Details for a cloud storage location associated with the external volume, where n is a unique number that distinguishes the location from others in the STORAGE_LOCATIONS list; for example, storage_location_1.

For more information about storage location properties, see CREATE EXTERNAL VOLUME.

active

The name of the active storage location for the external volume.

Access control requirements¶

A role used to execute this SQL command must have the following privileges at a minimum:

Privilege

Object

Notes

USAGE

External volume

For instructions on creating a custom role with a specified set of privileges, see Creating custom roles.

For general information about roles and privilege grants for performing SQL actions on securable objects, see Overview of Access Control.

Usage notes¶

  • To post-process the output of this command, you can use the RESULT_SCAN function, which treats the output as a table that can be queried.

Examples¶

Describe an external volume:

DESC EXTERNAL VOLUME my_external_volume;
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The following shows the output of DESCRIBE EXTERNAL VOLUME for an external volume with one storage location. The property value for STORAGE_LOCATION_1 is abbreviated for display purposes.

+-------------------+--------------------+---------------+-------------------------------------------------------------------------------------------+------------------+
| parent_property   | property           | property_type | property_value                                                                            | property_default |
|-------------------+--------------------+---------------+-------------------------------------------------------------------------------------------+------------------|
|                   | ALLOW_WRITES       | Boolean       | true                                                                                      | true             |
| STORAGE_LOCATIONS | STORAGE_LOCATION_1 | String        | {"NAME":"my_storage_us_west","STORAGE_PROVIDER":"S3","STORAGE_BASE_URL":"s3://...", ...}  |                  |
| STORAGE_LOCATIONS | ACTIVE             | String        | my_storage_us_west                                                                        |                  |
+-------------------+--------------------+---------------+-------------------------------------------------------------------------------------------+------------------+
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