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