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system.error_log

Querying in ClickHouse Cloud

The data in this system table is held locally on each node in ClickHouse Cloud. Obtaining a complete view of all data, therefore, requires the clusterAllReplicas function. See here for further details.

Contains history of error values from table system.errors, periodically flushed to disk.

Columns:

  • hostname (LowCardinality(String)) — Hostname of the server executing the query.
  • event_date (Date) — Event date.
  • event_time (DateTime) — Event time.
  • code (Int32) — Code number of the error.
  • error (LowCardinality(String)) - Name of the error.
  • value (UInt64) — The number of times this error happened.
  • remote (UInt8) — Remote exception (i.e. received during one of the distributed queries).
  • last_error_time (DateTime) — The time when the last error happened.
  • last_error_message (String) — Message for the last error.
  • last_error_query_id (String) — Id of a query that caused the last error (if available).
  • last_error_trace (Array(UInt64)) — A stack trace that represents a list of physical addresses where the called methods are stored.

Example

SELECT * FROM system.error_log LIMIT 1 FORMAT Vertical;

Row 1:
──────
hostname:            clickhouse.testing.internal
event_date:          2025-11-11
event_time:          2025-11-11 11:35:28
code:                60
error:               UNKNOWN_TABLE
value:               1
remote:              0
last_error_time:     2025-11-11 11:35:28
last_error_message:  Unknown table expression identifier 'system.table_not_exist' in scope SELECT * FROM system.table_not_exist
last_error_query_id: 77ad9ece-3db7-4236-9b5a-f789bce4aa2e
last_error_trace:    [100506790044914,100506534488542,100506409937998,100506409936517,100506425182891,100506618154123,100506617994473,100506617990486,100506617988112,100506618341386,100506630272160,100506630266232,100506630276900,100506629795243,100506633519500,100506633495783,100506692143858,100506692248921,100506790779783,100506790781278,100506790390399,100506790380047,123814948752036,123814949330028]

See also

  • error_log setting — Enabling and disabling the setting.
  • system.errors — Contains error codes with the number of times they have been triggered.
  • Monitoring — Base concepts of ClickHouse monitoring.