DROP DATABASE    Syntax DROP {DATABASE | SCHEMA} [IF EXISTS] db_name
 Description DROP DATABASE drops all tables in the database and deletes the database. Be very careful with this statement! To use DROP DATABASE, you need the DROP privilege on the database. DROP SCHEMA is a synonym for DROP DATABASE. Important: When a database is dropped, user privileges on the database are not automatically dropped. See GRANT. IF EXISTS Use IF EXISTS to prevent an error from occurring for databases that do not exist. A NOTE is generated for each non-existent database when using IF EXISTS. See SHOW WARNINGS. Atomic DDL 
MariaDB starting with 10.6.1MariaDB 10.6.1 supports Atomic DDL.  DROP DATABASE is implemented as loop over all tables
  DROP TABLE table

Each individual DROP TABLE is atomic while DROP DATABASE as a whole is crash-safe. 
Examples DROP DATABASE bufg;
Query OK, 0 rows affected (0.39 sec)

DROP DATABASE bufg;
ERROR 1008 (HY000): Can't drop database 'bufg'; database doesn't exist

 \W
Show warnings enabled.

DROP DATABASE IF EXISTS bufg;
Query OK, 0 rows affected, 1 warning (0.00 sec)
Note (Code 1008): Can't drop database 'bufg'; database doesn't exist

See Also 

CREATE DATABASE 

ALTER DATABASE 

SHOW DATABASES 

Information Schema SCHEMATA Table 
SHOW CREATE DATABASE
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