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

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/zh/operations/system-tables/distributed_ddl_queue

system.distributed_ddl_queue

包含有关在集群上执行的分布式ddl查询(集群环境)的信息.

列信息:

  • entry (String) — 查询ID.
  • host_name (String) — 主机名称.
  • host_address (String) — 主机名解析到的IP地址.
  • port (UInt16) — 主机端口.
  • status (Enum8) — 查询状态.
  • cluster (String) — 群集名称.
  • query (String) — 执行查询.
  • initiator (String) — 执行查询的节点.
  • query_start_time (DateTime) — 查询开始时间.
  • query_finish_time (DateTime) — 查询结束时间.
  • query_duration_ms (UInt64) — 查询执行时间(毫秒).
  • exception_code (Enum8) — 来自于ZooKeeper的异常代码.

示例

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.