ClickHouse/docs/en/operations/system-tables/distributed_ddl_queue.md

# system.distributed_ddl_queue {#system_tables-distributed_ddl_queue}

Contains information about distributed ddl queries (ON CLUSTER queries) 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`  ([Enum](../../sql-reference/data-types/enum.md)) - Stats 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)) - Nod that executed the query.
-   `query_start_time` ([Date](../../sql-reference/data-types/date.md)) — Query start time.
-   `query_finish_time` ([Date](../../sql-reference/data-types/date.md)) — Query finish time.
-   `query_duration_ms` ([UInt64](../../sql-reference/data-types/datetime64.md)) — Duration of query execution in milliseconds.
-   `exception_code`  ([Enum](../../sql-reference/data-types/enum.md)) - Exception code from 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) <!--hide-->