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Docs - distributed_ddl_queue

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docs/en/operations/system-tables/distributed_ddl_queue.md Normal file
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# 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.
- `value` ([String](../../sql-reference/data-types/string.md)) - Node value.
- `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` ([DateTime64](../../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') AND (entry = 'query-0000000000')
LIMIT 2
FORMAT Vertical
Query id: 856f0efd-07c9-4f1a-815f-a19112df5bb3
Row 1:
──────
entry: query-0000000000
host_name: clickhouse01
host_address: 172.23.0.11
port: 9000
status: finished
cluster: test_cluster
value: version: 1
query: CREATE DATABASE test_db UUID '40ac7692-70d3-48a9-bc29-4ade18957f59' ON CLUSTER test_cluster
hosts: ['clickhouse01:9000','clickhouse02:9000','clickhouse03:9000','clickhouse04:9000']
initiator: clickhouse01:9000
query_start_time: 2020-12-15 10:06:35
query_finish_time: 2020-12-15 10:06:35
query_duration_ms: 7
exception_code: ZOK
Row 2:
──────
entry: query-0000000000
host_name: clickhouse02
host_address: 172.23.0.12
port: 9000
status: finished
cluster: test_cluster
value: version: 1
query: CREATE DATABASE test_db UUID '40ac7692-70d3-48a9-bc29-4ade18957f59' ON CLUSTER test_cluster
hosts: ['clickhouse01:9000','clickhouse02:9000','clickhouse03:9000','clickhouse04:9000']
initiator: clickhouse01:9000
query_start_time: 2020-12-15 10:06:35
query_finish_time: 2020-12-15 10:06:35
query_duration_ms: 7
exception_code: ZOK
2 rows in set. Elapsed: 0.032 sec.
```
[Original article](https://clickhouse.tech/docs/en/operations/system_tables/distributed_ddl_queuedistributed_ddl_queue.md) <!--hide-->