text_log

Contains logging entries. The logging level which goes to this table can be limited to the text_log.level server setting.

Columns:

event_date (Date) — Date of the entry.
event_time (DateTime) — Time of the entry.
event_time_microseconds (DateTime) — Time of the entry with microseconds precision.
microseconds (UInt32) — Microseconds of the entry.
thread_name (String) — Name of the thread from which the logging was done.
thread_id (UInt64) — OS thread ID.
level (Enum8) — Entry level. Possible values:
- 1 or 'Fatal'.
- 2 or 'Critical'.
- 3 or 'Error'.
- 4 or 'Warning'.
- 5 or 'Notice'.
- 6 or 'Information'.
- 7 or 'Debug'.
- 8 or 'Trace'.
query_id (String) — ID of the query.
logger_name (LowCardinality(String)) — Name of the logger (i.e. DDLWorker).
message (String) — The message itself.
revision (UInt32) — ClickHouse revision.
source_file (LowCardinality(String)) — Source file from which the logging was done.
source_line (UInt64) — Source line from which the logging was done.

Example

SELECT * FROM system.text_log LIMIT 1 \G

Row 1:
──────
event_date:              2020-09-10
event_time:              2020-09-10 11:23:07
event_time_microseconds: 2020-09-10 11:23:07.871397
microseconds:            871397
thread_name:             clickhouse-serv
thread_id:               564917
level:                   Information
query_id:
logger_name:             DNSCacheUpdater
message:                 Update period 15 seconds
revision:                54440
source_file:             /ClickHouse/src/Interpreters/DNSCacheUpdater.cpp; void DB::DNSCacheUpdater::start()
source_line:             45

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text_log

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