system.distributed_ddl_queue

Description

Contains information about distributed ddl queries (ON CLUSTER clause) that were executed on a cluster.

Columns

• entry (String) — Query id.
• entry_version (Nullable(UInt8)) — Version of the entry.
• initiator_host (Nullable(String)) — Host that initiated the DDL operation.
• initiator_port (Nullable(UInt16)) — Port used by the initiator.
• cluster (String) — Cluster name, empty if not determined.
• query (String) — Query executed.
• settings (Map(String, String)) — Settings used in the DDL operation.
• query_create_time (DateTime) — Query created time.
• host (Nullable(String)) — Hostname.
• port (Nullable(UInt16)) — Host Port.
• status (Nullable(Enum8(‘Inactive’ = 0, ‘Active’ = 1, ‘Finished’ = 2, ‘Removing’ = 3, ‘Unknown’ = 4))) — Status of the query.
• exception_code (Nullable(UInt16)) — Exception code.
• exception_text (Nullable(String)) — Exception message.
• query_finish_time (Nullable(DateTime)) — Query finish time.
• query_duration_ms (Nullable(UInt64)) — Duration of query execution (in milliseconds).

Example

SELECT *
FROM system.distributed_ddl_queue
WHERE cluster = 'test_cluster'
LIMIT 2
FORMAT Vertical

Query id: f544e72a-6641-43f1-836b-24baa1c9632a

Row 1:
─