system.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 ZooKeeper.

Example

  1. SELECT *
  2. FROM system.distributed_ddl_queue
  3. WHERE cluster = 'test_cluster'
  4. LIMIT 2
  5. FORMAT Vertical
  7. Query id: f544e72a-6641-43f1-836b-24baa1c9632a
  9. Row 1:
  10. ──────
  11. entry:             query-0000000000
  12. host_name:         clickhouse01
  13. host_address:      172.23.0.11
  14. port:              9000
  15. status:            Finished
  16. cluster:           test_cluster
  17. query:             CREATE DATABASE test_db UUID '4a82697e-c85e-4e5b-a01e-a36f2a758456' ON CLUSTER test_cluster
  18. initiator:         clickhouse01:9000
  19. query_start_time:  2020-12-30 13:07:51
  20. query_finish_time: 2020-12-30 13:07:51
  21. query_duration_ms: 6
  22. exception_code:    ZOK
  24. Row 2:
  25. ──────
  26. entry:             query-0000000000
  27. host_name:         clickhouse02
  28. host_address:      172.23.0.12
  29. port:              9000
  30. status:            Finished
  31. cluster:           test_cluster
  32. query:             CREATE DATABASE test_db UUID '4a82697e-c85e-4e5b-a01e-a36f2a758456' ON CLUSTER test_cluster
  33. initiator:         clickhouse01:9000
  34. query_start_time:  2020-12-30 13:07:51
  35. query_finish_time: 2020-12-30 13:07:51
  36. query_duration_ms: 6
  37. exception_code:    ZOK
  39. 2 rows in set. Elapsed: 0.025 sec.

Original article