Skip to content
ClickHouse Docs
49.6kGet Started

error_log

View as MarkdownEdit this pageReport an issueSet up docs MCP

Autogenerated from ClickHouse system tables

Description

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

It is safe to truncate or drop this table at any time.

Columns

  • hostname (LowCardinality(String)) — Hostname of the server executing the query.
  • clickhouse_version (LowCardinality(String)) — Version of the ClickHouse server that produced the row.
  • system_processor (LowCardinality(String)) — CPU architecture of the ClickHouse server that produced the row.
  • event_date (Date) — Event date.
  • event_time (DateTime) — Event time.
  • code (Int32) — Error code.
  • error (LowCardinality(String)) — Error name.
  • value (UInt64) — Number of errors happened in time interval.
  • 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 of the last error. On ELF platforms except FreeBSD, addresses inside the main ClickHouse binary are stored as physical file offsets, and other addresses are virtual memory addresses inside the ClickHouse server process.

Examples

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.
Navigation