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2.5 KiB
2.5 KiB
slug |
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/en/operations/system-tables/distributed_ddl_queue |
distributed_ddl_queue
Contains information about distributed ddl queries (ON CLUSTER clause) that were executed on a cluster.
Columns:
entry
(String) — Query id.host_name
(String) — Hostname.host_address
(String) — IP address that the Hostname resolves to.port
(UInt16) — Host Port.status
(Enum8) — Status of the query.cluster
(String) — Cluster name.query
(String) — Query executed.initiator
(String) — Node that executed the query.query_start_time
(DateTime) — Query start time.query_finish_time
(DateTime) — Query finish time.query_duration_ms
(UInt64) — Duration of query execution (in milliseconds).exception_code
(Enum8) — Exception code from ClickHouse Keeper.
Example
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.