ClickHouse/docs/en/operations/system-tables/errors.md

slug
/en/operations/system-tables/errors

errors

Contains error codes with the number of times they have been triggered.

Columns:

• name (String) — name of the error (errorCodeToName).
• code (Int32) — code number of the error.
• value (UInt64) — the number of times this error has been happened.
• last_error_time (DateTime) — time when the last error happened.
• last_error_message (String) — message for the last error.
• last_error_trace (Array(UInt64)) — A stack trace which represents a list of physical addresses where the called methods are stored.
• remote (UInt8) — remote exception (i.e. received during one of the distributed query).

Example

SELECT name, code, value
FROM system.errors
WHERE value > 0
ORDER BY code ASC
LIMIT 1

┌─name─────────────┬─code─┬─value─┐
│ CANNOT_OPEN_FILE │   76 │     1 │
└──────────────────┴──────┴───────┘

WITH arrayMap(x -> demangle(addressToSymbol(x)), last_error_trace) AS all
SELECT name, arrayStringConcat(all, '\n') AS res
FROM system.errors
LIMIT 1
SETTINGS allow_introspection_functions=1\G