# system.distributed_ddl_queue {#system_tables-distributed_ddl_queue} Contains information about [distributed ddl queries (ON CLUSTER clause)](../../sql-reference/distributed-ddl.md) that were executed on a cluster. Columns: - `entry` ([String](../../sql-reference/data-types/string.md)) — Query id. - `host_name` ([String](../../sql-reference/data-types/string.md)) — Hostname. - `host_address` ([String](../../sql-reference/data-types/string.md)) — IP address that the Hostname resolves to. - `port` ([UInt16](../../sql-reference/data-types/int-uint.md)) — Host Port. - `status` ([Enum8](../../sql-reference/data-types/enum.md)) — Status of the query. - `cluster` ([String](../../sql-reference/data-types/string.md)) — Cluster name. - `query` ([String](../../sql-reference/data-types/string.md)) — Query executed. - `initiator` ([String](../../sql-reference/data-types/string.md)) — Node that executed the query. - `query_start_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — Query start time. - `query_finish_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — Query finish time. - `query_duration_ms` ([UInt64](../../sql-reference/data-types/datetime64.md)) — Duration of query execution (in milliseconds). - `exception_code` ([Enum8](../../sql-reference/data-types/enum.md)) — Exception code from [ZooKeeper](../../operations/tips.md#zookeeper). **Example** ``` sql SELECT * FROM system.distributed_ddl_queue WHERE cluster = 'test_cluster' LIMIT 2 FORMAT Vertical Query id: f544e72a-6641-43f1-836b-24baa1c9632a Row 1: ────── entry: query-0000000000 host_name: clickhouse01 host_address: 172.23.0.11 port: 9000 status: Finished cluster: test_cluster query: CREATE DATABASE test_db UUID '4a82697e-c85e-4e5b-a01e-a36f2a758456' ON CLUSTER test_cluster initiator: clickhouse01:9000 query_start_time: 2020-12-30 13:07:51 query_finish_time: 2020-12-30 13:07:51 query_duration_ms: 6 exception_code: ZOK Row 2: ────── entry: query-0000000000 host_name: clickhouse02 host_address: 172.23.0.12 port: 9000 status: Finished cluster: test_cluster query: CREATE DATABASE test_db UUID '4a82697e-c85e-4e5b-a01e-a36f2a758456' ON CLUSTER test_cluster initiator: clickhouse01:9000 query_start_time: 2020-12-30 13:07:51 query_finish_time: 2020-12-30 13:07:51 query_duration_ms: 6 exception_code: ZOK 2 rows in set. Elapsed: 0.025 sec. ``` [Original article](https://clickhouse.tech/docs/en/operations/system_tables/distributed_ddl_queuedistributed_ddl_queue.md)