-- Tags: no-parallel DROP DATABASE IF EXISTS test_truncate_database; -- test TRUNCATE DATABASE operation. -- create tables, views and dictionary and populate them. Then try truncating the database. -- all tables, views and dictionaries should be removed leaving an empty database CREATE DATABASE test_truncate_database; USE test_truncate_database; -- create tables with several different types of table engines CREATE TABLE source_table_memory (x UInt16) ENGINE = Memory; CREATE TABLE source_table_log (x UInt16) ENGINE = Log; CREATE TABLE source_table_tiny_log (x UInt16) ENGINE = TinyLog; CREATE TABLE source_table_stripe_log (x UInt16) ENGINE = StripeLog; CREATE TABLE source_table_merge_tree (x UInt16) ENGINE = MergeTree ORDER BY x PARTITION BY x; -- create dictionary source table CREATE TABLE source_table_dictionary ( id UInt64, value String ) ENGINE = Memory(); -- insert data into the tables INSERT INTO source_table_memory SELECT * FROM system.numbers LIMIT 10; INSERT INTO source_table_log SELECT * FROM system.numbers LIMIT 10; INSERT INTO source_table_tiny_log SELECT * FROM system.numbers LIMIT 10; INSERT INTO source_table_stripe_log SELECT * FROM system.numbers LIMIT 10; INSERT INTO source_table_merge_tree SELECT * FROM system.numbers LIMIT 10; INSERT INTO source_table_dictionary VALUES (1, 'First'); -- create view based on the tables CREATE VIEW dest_view_memory (x UInt64) AS SELECT * FROM source_table_memory; CREATE VIEW dest_view_log (x UInt64) AS SELECT * FROM source_table_log; CREATE VIEW dest_view_tiny_log (x UInt64) AS SELECT * FROM source_table_tiny_log; CREATE VIEW dest_view_stripe_log (x UInt64) AS SELECT * FROM source_table_stripe_log; CREATE VIEW dest_view_merge_tree (x UInt64) AS SELECT * FROM source_table_merge_tree; -- create dictionary based on source table CREATE DICTIONARY dest_dictionary ( id UInt64, value String ) PRIMARY KEY id SOURCE(CLICKHOUSE(HOST 'localhost' PORT tcpPort() DB 'test_truncate_database' TABLE 'source_table_dictionary')) LAYOUT(FLAT()) LIFETIME(MIN 0 MAX 1000); SELECT * FROM dest_view_memory ORDER BY x LIMIT 1; SELECT * FROM dest_view_log ORDER BY x LIMIT 1; SELECT * FROM dest_view_tiny_log ORDER BY x LIMIT 1; SELECT * FROM dest_view_stripe_log ORDER BY x LIMIT 1; SELECT * FROM dest_view_merge_tree ORDER BY x LIMIT 1; SELECT name, database, element_count FROM system.dictionaries WHERE database = 'test_truncate_database' AND name = 'dest_dictionary'; SELECT * FROM dest_dictionary; SELECT '=== TABLES IN test_truncate_database ==='; SHOW TABLES FROM test_truncate_database; SELECT '=== DICTIONARIES IN test_truncate_database ==='; SHOW DICTIONARIES FROM test_truncate_database; TRUNCATE DATABASE test_truncate_database; SELECT * FROM dest_view_set ORDER BY x LIMIT 1; -- {serverError UNKNOWN_TABLE} SELECT * FROM dest_view_memory ORDER BY x LIMIT 1; -- {serverError UNKNOWN_TABLE} SELECT * FROM dest_view_log ORDER BY x LIMIT 1; -- {serverError UNKNOWN_TABLE} SELECT * FROM dest_view_tiny_log ORDER BY x LIMIT 1; -- {serverError UNKNOWN_TABLE} SELECT * FROM dest_view_stripe_log ORDER BY x LIMIT 1; -- {serverError UNKNOWN_TABLE} SELECT * FROM dest_view_merge_tree ORDER BY x LIMIT 1; -- {serverError UNKNOWN_TABLE} SELECT name, database, element_count FROM system.dictionaries WHERE database = 'test_truncate_database' AND name = 'dest_dictionary'; SELECT * FROM dest_dictionary; -- {serverError UNKNOWN_TABLE} SHOW TABLES FROM test_truncate_database; SHOW DICTIONARIES FROM test_truncate_database; DROP DATABASE test_truncate_database;