DROP DATABASE

The DROP DATABASE statement removes a database and all its objects from a CockroachDB cluster. The DROP DATABASE statement performs a schema change. For more information about how online schema changes work in CockroachDB, see Online Schema Changes.

Required privileges

The user must have the DROP privilege on the database and on all tables in the database.

Synopsis

Parameters

Parameter	Description
`IF EXISTS`	Drop the database if it exists; if it does not exist, do not return an error.
`name`	The name of the database you want to drop. You cannot drop a database if it is set as the current database or if `sql_safe_updates = true`.
`CASCADE`	(Default) Drop all tables and views in the database as well as all objects (such as constraints and views) that depend on those tables. `CASCADE` does not list objects it drops, so should be used cautiously.
`RESTRICT`	Do not drop the database if it contains any tables or views.

Viewing schema changes

This schema change statement is registered as a job. You can view long-running jobs with SHOW JOBS.

Examples

Setup

To follow along, run cockroach demo to start a temporary, in-memory cluster with the movr sample dataset preloaded:

$ cockroach demo

Drop a database and its objects (`CASCADE`)

For non-interactive sessions (e.g., client applications), DROP DATABASE applies the CASCADE option by default, which drops all tables and views in the database as well as all objects (such as constraints and views) that depend on those tables. For interactive sessions from the built-in SQL client, either the CASCADE option must be set explicitly or the --unsafe-updates flag must be set when starting the shell.

> SHOW TABLES FROM movr;

  schema_name |         table_name         | type  | estimated_row_count
--------------+----------------------------+-------+----------------------
  public      | promo_codes                | table |                1000
  public      | rides                      | table |                 500
  public      | user_promo_codes           | table |                   0
  public      | users                      | table |                  50
  public      | vehicle_location_histories | table |                1000
  public      | vehicles                   | table |                  15
(6 rows)

> DROP DATABASE movr;

ERROR: rejected (sql_safe_updates = true): DROP DATABASE on current database
SQLSTATE: 01000

> USE defaultdb;

> DROP DATABASE movr;

ERROR: rejected (sql_safe_updates = true): DROP DATABASE on non-empty database without explicit CASCADE
SQLSTATE: 01000

> DROP DATABASE movr CASCADE;

> SHOW TABLES FROM movr;

ERROR: target database or schema does not exist
SQLSTATE: 3F000

Prevent dropping a non-empty database (`RESTRICT`)

When a database is not empty, the RESTRICT option prevents the database from being dropped:

> SHOW TABLES FROM movr;

  schema_name |         table_name         | type  | estimated_row_count
--------------+----------------------------+-------+----------------------
  public      | promo_codes                | table |                1000
  public      | rides                      | table |                 500
  public      | user_promo_codes           | table |                   0
  public      | users                      | table |                  50
  public      | vehicle_location_histories | table |                1000
  public      | vehicles                   | table |                  15
(6 rows)

> USE defaultdb;

> DROP DATABASE movr RESTRICT;

ERROR: database "movr" is not empty and RESTRICT was specified
SQLSTATE: 2BP01

Statements

Syntax

Data Types

Spatial Data

Constraints

Required privileges

Synopsis

Parameters

Viewing schema changes

Examples

Setup

Drop a database and its objects (`CASCADE`)

Prevent dropping a non-empty database (`RESTRICT`)

See also

​Required privileges

​Synopsis

​Parameters

​Viewing schema changes

​Examples

​Setup

​Drop a database and its objects (CASCADE)

​Prevent dropping a non-empty database (RESTRICT)

​See also

Required privileges

Synopsis

Parameters

Viewing schema changes

Examples

Setup

Drop a database and its objects (`CASCADE`)

Prevent dropping a non-empty database (`RESTRICT`)

See also