UNDROP DATABASE¶

Restores the most recent version of a dropped database.

See also:

CREATE DATABASE , ALTER DATABASE , DESCRIBE DATABASE , DROP DATABASE , SHOW DATABASES

Syntax¶

UNDROP DATABASE <name>
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Parameters¶

name

Specifies the identifier for the database to restore. If the identifier contains spaces or special characters, the entire string must be enclosed in double quotes. Identifiers enclosed in double quotes are also case-sensitive.

Usage notes¶

  • If a database with the same name already exists, an error is returned.

  • UNDROP relies on the Snowflake Time Travel feature. An object can be restored only if the object was deleted within the Data retention period. The default value is 24 hours.

  • Hybrid tables that belong to the specified database are not undropped.

  • If you have multiple dropped databases with the same name, you can use the IDENTIFIER keyword with the system-generated identifier (from the DATABASES view) to specify which database to restore. The name of the restored database remains the same. See Examples.

    Note

    You can only use the system-generated identifier with the IDENTIFIER() keyword when executing the UNDROP command for tables, schemas, and databases.

Examples¶

Basic example¶

Restore the most recent version of a dropped database (this example builds on the DROP DATABASE examples):

UNDROP DATABASE mytestdb2;
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+-------------------------------------------+
| status                                    |
|-------------------------------------------|
| Database MYTESTDB2 successfully restored. |
+-------------------------------------------+

SHOW DATABASES HISTORY;
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+---------------------------------+-----------+------------+------------+--------+--------+---------+---------+----------------+------------+
| created_on                      | name      | is_default | is_current | origin | owner  | comment | options | retention_time | dropped_on |
|---------------------------------+-----------+------------+------------+--------+--------+---------+---------+----------------+------------|
| Tue, 17 Mar 2015 16:57:04 -0700 | MYTESTDB  | N          | Y          |        | PUBLIC |         |         |              1 | [NULL]     |
| Tue, 17 Mar 2015 17:06:32 -0700 | MYTESTDB2 | N          | N          |        | PUBLIC |         |         |              1 | [NULL]     |
| Wed, 25 Feb 2015 17:30:04 -0800 | SALES1    | N          | N          |        | PUBLIC |         |         |              1 | [NULL]     |
| Fri, 13 Feb 2015 19:21:49 -0800 | DEMO1     | N          | N          |        | PUBLIC |         |         |              1 | [NULL]     |
+---------------------------------+-----------+------------+------------+--------+--------+---------+---------+----------------+------------+

UNDROP database using the database ID¶

Restore a dropped database by ID using IDENTIFIER(). You can find the database ID of the specific database to restore using the database_id column in the DATABASES view. For example, if you have multiple dropped databases named my_database, and you want to restore the second-to-last dropped database my_database, follow these steps:

  1. Find the database ID of the dropped database in the Account Usage DATABASES view:

    SELECT database_id,
  database_name,
  created,
  deleted,
  comment
FROM SNOWFLAKE.ACCOUNT_USAGE.DATABASES
WHERE database_name = 'MY_DATABASE'
AND deleted IS NOT NULL
ORDER BY deleted;
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    +-------------+---------------+-------------------------------+-------------------------------+---------+
| DATABASE_ID | DATABASE_NAME | CREATED                       | DELETED                       | COMMENT |
|-------------+---------------+-------------------------------+-------------------------------+---------|
|         494 | MY_DATABASE   | 2024-07-01 17:51:33.380 -0700 | 2024-07-01 17:51:46.228 -0700 | NULL    |
|         492 | MY_DATABASE   | 2024-07-01 17:51:52.560 -0700 | 2024-07-01 17:52:39.881 -0700 | NULL    |
|         493 | MY_DATABASE   | 2024-07-01 17:52:39.849 -0700 | 2024-07-01 17:52:44.562 -0700 | NULL    |
+-------------+---------------+-------------------------------+-------------------------------+---------+

  2. Undrop my_database by database ID. To restore the second-to-last deleted database, use database ID 492 from the output of the previous statement. After you execute the following statement, the database is restored with its original name, my_database:

    UNDROP DATABASE IDENTIFIER(492);
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