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* Updated doc of distributed_ddl_queue * Update docs/en/operations/system-tables/distributed_ddl_queue.md Co-authored-by: Alexander Tokmakov <tavplubix@gmail.com> * Update docs/en/operations/system-tables/distributed_ddl_queue.md Co-authored-by: Alexander Tokmakov <tavplubix@gmail.com> * Update docs/en/operations/system-tables/distributed_ddl_queue.md Co-authored-by: Alexander Tokmakov <tavplubix@gmail.com> --------- Co-authored-by: Alexander Tokmakov <tavplubix@gmail.com>
76 lines
3.1 KiB
Markdown
76 lines
3.1 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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- `entry_version` ([Nullable(UInt8)](../../sql-reference/data-types/int-uint.md)) - Version of the entry
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- `initiator_host` ([Nullable(String)](../../sql-reference/data-types/string.md)) - Host that initiated the DDL operation
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- `initiator_port` ([Nullable(UInt16)](../../sql-reference/data-types/int-uint.md)) - Port used by the initiator
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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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- `settings` ([Map(String, String)](../../sql-reference/data-types/map.md)) - Settings used in the DDL operation
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- `query_create_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — Query created time.
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- `host` ([String](../../sql-reference/data-types/string.md)) — Hostname
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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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- `exception_code` ([Enum8](../../sql-reference/data-types/enum.md)) — Exception code.
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- `exception_text` ([Nullable(String)](../../sql-reference/data-types/string.md)) - Exception message
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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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**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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entry_version: 5
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initiator_host: clickhouse01
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initiator_port: 9000
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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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settings: {'max_threads':'16','use_uncompressed_cache':'0'}
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query_create_time: 2023-09-01 16:15:14
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host: clickhouse-01
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port: 9000
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status: Finished
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exception_code: 0
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exception_text:
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query_finish_time: 2023-09-01 16:15:14
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query_duration_ms: 154
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Row 2:
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──────
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entry: query-0000000001
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entry_version: 5
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initiator_host: clickhouse01
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initiator_port: 9000
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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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settings: {'max_threads':'16','use_uncompressed_cache':'0'}
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query_create_time: 2023-09-01 16:15:14
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host: clickhouse-01
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port: 9000
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status: Finished
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exception_code: 630
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exception_text: Code: 630. DB::Exception: Cannot drop or rename test_db, because some tables depend on it:
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query_finish_time: 2023-09-01 16:15:14
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query_duration_ms: 154
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2 rows in set. Elapsed: 0.025 sec.
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```
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